“bill duncan” – A Thousand Acres of Silphiums

The Great American Eclipse – 2024 Edition – Practice Session

At the time I am writing this, a cool new app I have, EclipseOne, tells me the next Great American Eclipse will occur in 12 days, 13 hours, 22 minutes, and 2 seconds at my primary viewing location. There is not much time left to do your planning and practicing!

This past weekend, I put in a practice session – testing out the lens and camera combination, the solar finder and solar filter that will be going over my lens, and most importantly, using my tracker to track the sun as it moves across the sky. If you have an astro-tracking device that you might use for applications like deep-sky imaging or astro landscapes, I highly recommend you consider using this for the upcoming eclipse.

I know the question you might have before you even ask it. But how do we polar align in the daytime? True, you won’t be able to get precise polar alignment without the nighttime stars to guide your efforts, or at least without a lot of extra work. However, precise P.A. is not necessary to enjoy the benefits. I simply did my best to align the tracker facing north using a compass. I then tested the amount of time it took for the sun to move one of its diameter with and without using the tracker. This was easy because in my particular lens/camera combination, the circle that represents the spot-metering option was almost precisely the same size as the sun. Without the tracker it took only one minute and 22 seconds to move one of its diameter across my frame. With the tracker engaged (don’t forget to put your tracker in solar-tracking mode!), it took 22 minutes and seven seconds to move the same distance. Yes, there is a bit of drift due to imperfect PA, but this means I need only reposition the sun to the center of my frame once or twice an hour while using the tracker as opposed to doing this step 10 times or more an hour. Saving this kind of time during the big event will be a great benefit!

My imaging rig as it will look like on April 8th. I had to use both counterweights to balance this!

If you are planning to photograph the eclipse on April 8th, hopefully you have gotten your planning done, dusted off your solar filter and gotten some practice. If not, there’s still time, assuming we have some clear skies between now and then.

Wishing you all the best of luck on the big day and that the only rain we’ll see are Sol’s golden rays coming down from the clearest of skies!

-OZB

A Miscellaneous Trio

birds, wildlife, wildlife photography

Just a trio of birds photographed in 2023 that didn’t fit into any specific post.

Bathing Field Sparrow photographed in August at Bush Wildlife C.A.

Bell’s Vireo photographed at same date and location.

Lincoln’s Sparrow photographed in May at Tower Grove Park

What a Difference a Week Makes – Photographing Ferocious Hunters at Carlyle Lake Spillway

birds, wildlife, wildlife photography

On a couple of successive Saturdays in mid-February, I had the pleasure to find myself at an old favorite spot to practice my high-speed action photography on some of the cutest little predators that I can imagine. In a spot more popular with fisher folk, I setup immediately behind the spillway of the Carlyle Lake damn with high hopes of shooting the Bonaparte’s Gulls that winter in this area.

On my first Saturday visit, these cute little “Bonnies” represented at least 75% of the gull species taking advantage of the stunned gizzard and threadfin shad that come pouring through the spillway. This was great! Although photographing Ring-billed Gulls is always good for practice, they don’t excite me very much at all. What wasn’t great on this first day was the light, which I would describe as something like the sloppy end of a morning’s constitutional. Thank goodness for modern cameras with much improved high ISO performance and autofocus systems!

Photographing Bonnies while hunting like this is a real test of a photographer’s skills and their photographic gear. These guys are faster than a prairie fire with a tailwind. They have to be with the ever present Ring-billed Gulls nearby waiting to steal an easy meal.

A Ring-Billed Gull attempting to take the Bonaparte’s Gull’s fish. Typically the Ring-billed are much too slow once the Bonnie has their catch.

The photos I’ve shared so far all showed adult winter-plumaged Bonaparte’s Gulls. First-year winter birds are east to distinguish from the adults with their black tail bands and “M”-shaped black markings on their wing tops. These first year birds are every bit the skilled fishers that the adults are as you can see below.

On my next visit a week later, the skies were clear and I was now challenged with a pretty strong mid-day light coming into the spillway. I felt that this still should afford more speed and a bit better image quality than I had on my previous visit. Unfortunately, the Bonnies must have moved elsewhere. Most of the gulls present were Ring-billed and I only counted four Bonnies during the hour or so I was there.

Wildlife photographers looking for a fun and fast-paced challenge that has no chance of interfering with their photographic subjects should really consider visiting this location.

-OZB

Brilliant Jumping Spider (Phidippus clarus)

macro, wildlife, wildlife photography

Time to get into the season by sharing a brilliant spider for October. This brilliant jumping spider was photographed back in July at Horn’s Prairie Grove LWR. This is one of several jumping spiders that are believed to be mimics of the Mutillidae family of wasps, better known as “velvet ants.”

The Cygnus Veil Complex @ 260mm

astrophotography

The Cygnus Veil Complex
The Cygnus Veil, also known as the Cygnus Loop, is a large (~ 3° in diameter) emission nebula created by a supernova explosion that occurred ~ 20,000 years ago. It lies an estimated 2400 light years from our solar system within the Cygnus (Swan) constellation.

Due to the large size of this gaseous complex, most astrophotographers choose to separately photograph distinct portions of the loop, or those portions of the loop that can be seen in visible light. The nebula on the left-hand side of this image is known as the Eastern Veil (Sh2-103, NGC6992, NGC6995), and on the far right lies the Western Veil, or the Witch’s Broom (NGC6960). In between these two lies Pickering’s Triangle (NGC6979), which was first discovered by the Scottish-born photographer, Williamina Fleming in 1904.

Somewhere inside this loop is the compact stellar remnant – the remains of the star that went supernova. Depending on the size of the star, this will either be a neutron star or a black hole. Both of these options are very difficult to identify as they do not emit much in the way of detectable radiation. Despite attempts by astronomers, the identity and position of the compact stellar remnant have not yet been discovered.

Collecting the data
Due to the interference of clouds and life requirements, I missed the previous two new moon phases and it had been close to three months without an AP session. I was eager to get out there under clear skies in lovely September temperatures. Miguel found us a new imaging location – Whetstone Creek Conservation Area. This location has slightly darker skies (Bortle 3 vs. Bortle 4) and is only about a ten minute longer drive from my front door. To top it off, it is also seems less popular (at least during my first visit). I definitely have a new home for my astrophotography pursuits!

Date and location
Imaged on the night of 14/15 September 2023 at Whetstone Creek Conservation Area in Callaway County, Missouri (Bortle 3).
Dark period: 20:46 – 05:15
Target period: 15:30 – 05:10

Conditions
The forecast was great for the night we chose for this session, but it turned out not to be perfect. We lost two hours of potential imaging time due to clouds that would not clear out until about 22:00 and clouds remained in the lower west that screwed up another hour or so on the late end. Temperatures were great, but seemed quite cold, with lows in the upper 40s F. Winds speeds were perfect with nothing above 4 mph across the night.

Equipment
Astro-modified Canon 7D mkii camera, Askar ACL200 200mm f/4 lens (260mm focal length equivalent), Fornax LighTrack II tracking mount without guiding on a William Optics Vixen Wedge Mount. QHYCCD Polemaster. Gitzo CF tripod, Canon shutter release cable, laser pointer to help find Polaris and sky targets, lens warmer to prevent dew and frost on lens, dummy battery to power camera, lithium battery generator to provide power to camera, dew heater and laptop computer.

This was “first-light” for my new Askar 200mm lens – a lens specifically designed for astrophotography purposes. It is excellently built and provides a distortion-free field of view which was a hindrance of my Canon 200mm f/2.8 lens. When perfectly focused (read more of this below), it will definitely shine in comparison to my old 200mm focal length option.

Imaging Details
Lights taken (ISO 3200, f/4, 120 second exposure): 178
Lights after cull due to tracker error, wind, bumps, clouds, etc.: 146
Used best 95% of remaining frames for stack for a total of 138 subs used for integration (4h 36m)
Calibration frames: none

Processing
RAW files converted to TIF in Canon DPP, stacked in Astro Pixel Processor, GraXpert for gradient removal, Starnet++ for separating nebulas from stars, Photoshop CS6 for stretching and other cosmetic adjustments.

Problems and learnings

Canon banding
After months of diving into the forums and other online sources of information, I came away with only one strategy to hopefully avoid the terrible “Canon banding” problem I faced in a couple of previous sessions during warmer temperatures. In order to get my target above the sources of noise, I elevated the ISO used. In addition, I increased the sub exposure time. Increasing the sub times was partly in necessity of using a lens with an f/4 widest available aperture. I also moved the peak of the histogram for these exposure further to the right than I typically have. Thankfully, with my new tracker and polar alignment process, two-minute subs were easily accomplished without any issues. I could definitely go longer, but keeping the ISO at or above 3200 would not allow for this in order to keep the histogram where it needed to be.

After reading from a number of trusted sources, suggesting dark frames offer little-to-no benefit using my particular camera, I eliminated taking dark frames and any other calibration frames. This was an experiment. In practice, with enough total integration time to remove noise in the stack, I do conclude that dark frames/calibration are not necessary in my AP process. Additionally, there is some thought that using dark frame calibration can increase the potential for Canon banding and other issues that can show up during the stretch. This is a welcome finding indeed! With taking longer sub-exposures now, taking the required number of dark frames could add well over an hour to my night sessions.

The downside of using such an elevated ISO setting is the reduction in dynamic range. This probably does mean I am losing some tonal gradients and perception of sharpness in the final image. However, this is better than dealing with the banding problem that almost kills the project. I will keep this strategy moving forward.

Focusing
The new lens offers great focusing aid. It has two focusing rings – one for coarse and one for fine focus, and each of these has a lock so that you will not inadvertently change these over the course of the evening. But, the tool is only as good as those who yield it. I had a little trouble with the fine adjustment and realized that the majority of my frames were not optimally focused. Overall, the image doesn’t suffer too badly from this oversight. With the focus problem and the never-optimal seeing conditions in Missouri, my FWHM (Full Width at Half Maximum) were in the 6-8 range. An FWHM of two or less is considered optimum for the uber astrophotographers out there. Always learning!

Processing
I would really like to improve my processing skills for this work. Although I love the amount of hydrogen-alpha (the reds and magentas) that my sensor collects, the blues and star colors seem to get lost in the stretch. From my knowledge, I am using the correct curves adjustments that are supposed to avoid this, but there should be a lot more of the blues that are emitted from oxygen emission in this target. In addition, the blues are coming out more teal-colored, which I do not find all that attractive.

Conclusion
With all the challenges I discussed above, I suppose I am relatively pleased with this one. I think I left some detail on the table, but there is enough there to make it interesting. The image handled the stretch well with no real signs of the dreaded Canon banding. This is an impressive and interesting target. I may try again using the 300mm lens. At that focal length, it is a tight fit. I hesitated to use it this time because of the potential of losing some of the target during cropping to eliminate stacking artifacts around the frame edges.

What do you think? Is this worth the time and effort? After looking at these images for so long, I find myself unable to really give them the critical eye needed to make this judgement. Feel free to leave a comment with your opinion.

Cooper’s Hawk!

birds, Nesting Birds of Missouri, wildlife, wildlife photography

Spent some time recently looking for mink in a St. Louis County park. No luck on the mink but this vocal Cooper’s Hawk flew in for a minute on this perch and allowed me to get a few shots. This species was named after the American naturalist, William Cooper, who was a contemporary of John James Audubon and Charles Lucien Bonaparte.

Schinia nr-jaguarina (French-grass Flower Moth)

insects, Lepidoptera, macro, wildlife, wildlife photography

These are some older photos that I posted on Facebook back in 2018 when I had the annoying habit of posting some interesting topics only on Facebook for some reason.

*Schinia nr-jaguarina* (French-grass flower moth)

Only discovered in 2012, this species of flower moth (Schinia nr-jaguarina) has yet to be described and named. This was photographed at Desplaines State Fish and Wildlife Area near Joliet Illinois. This species seems to be an obligate feeder on Orbexilum onobrychis (scurf pea, french-grass, among others). To read more about this recent discovery, head over to this location: http://jimmccormac.blogspot.com/…/interesting-moth-new…

2023 Update
This past weekend, the WGNSS Entomology Group spent the better part of a day exploring the wonderful Horn’s Prairie Grove LWR, just north of Vandalia, IL, and discovered a population of Schinia nr-jaguarina (apparently, this species has still not been officially described and the specific name given here is just a placeholder).

One of us collected a specimen to rear so I might be able to get photographs of an adult soon.

Passionflower Flea Beetle (Disonycha discoidea)

macro, wildlife, wildlife photography

Ever since seeing the photo of Disonycha discoidea in Arthur Evans’ “Beetles of Eastern North America,” I have been wanting to find and photograph this gorgeous Chrysomelid. I have looked for years for this species around St. Louis and southeastern Missouri, and even planted one of its host plants, Passiflora incarnata, in our yard hoping to possibly attract them.

*Disonycha discoidea* (passionflower flea beetle)

Just a couple weeks ago, my friend, Pete, posted a bunch of picks from his botany trip to southern Illinois on Facebook. As I perused through his collection of fascinating plants he found, I stopped at a photo of several beetles that were on a grape vine. In this photo was a single D. discoidea. Getting a little upset, I messaged Pete to see if he could tell me exactly where he had found this. He was at Giant City State Park and because of smartphone technology, he forwarded me his geotagged photo and I had access to exactly where he had taken the picture.

However, I knew this was a big risk and I didn’t get my hopes up. First, Pete had taken his photo approximately a week before Sarah and I took the 2.5 hour drive south. In addition, the beetle he photographed was on a grapevine, not their typical host plant. Was this just an accidental occurrence of this beetle or could they use grapes as an alternative host? Nothing in the literature suggested that this occurred with this species; apparently, it is monophagous and only uses members of the Passiflora to feed.

We decided it was worth the drive. Giant City State Park is a high quality area and I knew that if we struck out we wouldn’t have to try hard to find something else of interest. We found Pete’s spot of original find pretty easily and started searching. After a couple hours of looking as hard as we could among the grape and poison ivy we decided we weren’t going to find the species there. Utilizing smartphone technology again, I thought it might be a good idea to look for Passiflora plants that had been documented in iNaturalist within the park. My phone signal was pretty poor, so we drove to one of the highest points we could find and I found a single spot that had these plants documented.

These plants were found in a poor scrub prairie habitat along with blackberry and even more poison ivy. We started looking, finding and searching between 50 and 100 of these short plants. We looked very closely and I had a chance to try my DIY collapsible beat sheets that I made over the winter. No luck. I couldn’t believe it. I really thought we had a good chance. We knew the species had been found in the park and here we were within a sizeable population of the host plants. You’ve seen the photos already, so obviously we found our target. And, of course, insect finder extraordinaire, Sarah, was the one to find the beetle on a ragged, half-eaten P. incarnata plant. I immediately got to work photographing from a safe distance. One of the reasons they call them flea beetles is that they will jump great distances upon being disturbed. Ultimately, we found four individuals all on the same plant. Thankfully, this species is quite large for a flea beetle and I didn’t need to get too close that higher magnifications would require.

The aposematic colored *Disonycha discoidea* (passionflower flea beetle)

So what’s up with that coloration?
This species exhibits aposematism, also known as warning coloration. This is the same reason that unpalatable or downright toxic species like monarchs and milkweed bugs along with stinging predators like yellowjackets or velvet ants show warning colorations. Disonycha discoidea picks up cyanogenic glycosides from its Passiflora host plant, making it distasteful or toxic to would-be predators. By evolving this aposematism, the insects can advertise this and avoid the predators that would be on the lookout for an easy meal. In the tropics, a group of butterflies known as the heliconiines also acquire these toxic compounds from the larval feeding on Passiflora.

It was great to finally find this target species. The larvae of this species is also quite photogenic. If I find the time to make a return visit this summer, I would love to find a few of them as well.

Thanks for stopping by!
OZB

Witch’s Head Nebula – IC 2118 (December 2022)

astrophotography

The aptly named Witch’s Head Nebula (IC 2118, NGC 1909) gazing towards the star, Rigel, which gives this nebula the light that we can see her by.

Witch’s Head Nebula (IC 2118, NGC 1909)
IC 2118 has been on my list of potential deep sky objects to photograph since I first hear about her. I didn’t think I would have the skills or techniques to do her justice so soon but my plans for shooting M42 with the 300 mm lens were dashed again because of high winds. I studied the area and figured out my desired composition using a 200mm lens and a 1.6 x crop body camera and this is pretty much the result I was hoping for.

Why is this target so difficult for photographing? IC 2118 is known as a reflection nebula, meaning that there aren’t a lot of highly illuminous stars or star formation occurring within this collection of dust and gas. This very dim (apparent magnitude of 13) reflection nebula is primarily illuminated by the 7th brightest star in our sky – Rigel, the left foot in the constellation of Orion. Rigel, located 2.6 degrees to the east of IC 2118, is actually a system of four stars in close proximity. Rigel A is the primary star and is measured to be approximately 120,000 times more luminous than our sun, with an apparent magnitude of 0.13. It is a young star, approximately 8 million years old and has already burned through the hydrogen in its core. It is now burning heavier elements and will one day go supernova – one of the closest stars to us that will do this. When this happens, it is estimated that it will be as visible to us on earth as a quarter moon!

Back to the oh-so-appropriately named Witch’s Head. Due to the blue color of Rigel and the properties of this light scattering off of the gas and dust, this nebula appears blue in color, similar to the reason why our sky is blue on earth. Astronomers are unsure if the nebula is the remnants of an ancient supernova itself or just a collection of dust and gas. Although being close to, or perhaps a part of, the Orion molecular cloud complex, IC 2118 officially lies in the constellation Eridanus. This nebula is approximately 800 light years from earth and of course is absolutely huge. IC 2118 is roughly 1 x 3 degrees in our night sky and roughly 50 light years long. It is not visible to the naked eye from earth, but to give a size comparison of the amount of sky this object would take if we could see it, it would roughly be equivalent in length to six full moons in our night sky.

Collecting the data (27/28 December)
It was nice having two opportunities in December to work on astrophotography. Like I mentioned above, I was hoping to do a closeup of Orion and Running Man nebulas but with 10-12 mph steady winds with gusts above 20 mph, I knew I better not shoot with the 300 mm lens. IC 2118 was definitely on my list and could be captured with the much smaller 200 mm lens. The weather forecast was tricky and one of four weather apps suggested that clouds would ruin my night starting around 01:00. Even if so, which it did, I could still get up to six hours on the target.

I was by myself for this session, Miguel having something else, like sleeping I guess, going on this evening. And I setup at the usual location – Danville Conservation Area. It was truly windy and the temps hovered around the freezing point, which was warmer than the last time we went out.

An individual, unprocessed 30 second exposure. Looking closely, you can just make out the witch’s head on a computer monitor. I could not on the back of my camera!

Being such a dim target presented a significant challenge. Primarily, with a 35% luminated moon, I struggled a bit with getting exposure where I wanted. I would have liked to use ISO 3200, but when I started, this put the histogram peak above the 50% line. So I decided to use ISO 1600 using 30 second exposures. When the moon set at 22:04, I knew the histogram peak would drop and it did to a little less than the 20% mark. This was concerning because I knew this would be too close to get the signal to noise ratio I needed, especially with such a dim target. I contemplated changing the ISO up to 3200 but then I wouldn’t be able to stack the two sets taken at different ISOs with my dark frames while being able to use the process to remove satellites and plane trails. Instead, I opened up the aperture from f/3.5 to f/3.2. This gave me a third stop more light for each sub. I wasn’t sure if this was going to work, especially not being able to see the target in an individual frame!

As I feared, clouds came in heavier than 3 out of 4 weather apps and a meteorologist predicted! So, I shut down around 01:45 and made it home by 03:30 – an early night!

Equipment
Astro-modified Canon 7D mkii camera, Canon 200mm f/2.8 lens, Skywatcher Star Adventurer tracker without guiding on a William Optics Vixen Wedge Mount. Gitzo CF tripod, Canon shutter release cable, laser pointer to help find Polaris and sky targets, lens warmer to prevent dew and frost on lens, dummy battery to power camera, cart battery to provide power to camera and dew heater, right-angle viewfinder to aid in polar alignment.

Imaging details
Lights taken (30 seconds; ISO 1600; f/3.5 and f/3.2) 671 taken, manually removed bad subs due to tracking errors, winds and clouds for a total of 433 used in integration.
Darks: 49
Bias and Flats: Not taken. Removed most vignetting and some chromatic aberration while converting RAW images to TIF.

Processing
Not knowing for sure if my individual sub-exposures were going to be accurate, I was eager to get to the processing. After removing obviously bad sub-exposures, I plugged the 433 photos into Deep Sky Stacker and told it to use the best 90% of those, giving me a total of 3.25 hours of integration time.

It’s amazing how I can get sucked into processing these DSO images. This one only took me about four hours from start to finish but it seemed like no time at all. I also used GraXpert to remove gradients and various steps in Photoshop CS6.

Problems and learnings
This is definitely an object you want to shoot without light pollution and with as much time as you can possibly get on her. With roughly half my night lit by the moon and not getting as much time as I had hoped for, I am very pleased with the outcome. I hope to try this one again someday. Being a winter target, it is possible to get 8-10 hours on this target in a single night. This would help bring out the surrounding dust and provide better definition of the target herself. I did wind up using some subs that had light clouds, providing the halo around Rigel that normally wouldn’t be there. I don’t think this hurt the image, however. I could also shoot her with the 300 mm lens but this would eliminate Rigel in the frame and I don’t think would be nearly as interesting.

Conclusion
This is the second image of five I hope to make around the Orion molecular cloud complex. I did not expect to shoot the witch this soon but I am pleased that I have learned enough to make a competent image of this dim and challenging subject. After doing this a few months in a row, I am much more confident in what I am doing and using my kit has almost become old hat. As long as the weather gods bless me, I am feeling much more confident in being able to capture and process the targets that are within my capabilities. I hope to upgrade my tracking mount within the next year or two but I will continue with what I have at the present.

Leps from the Prairie Garden Trust

macro, WGNSS Field Trips, wildlife, wildlife photography

I’m finally getting around to posting photos of some Leps that were taken during the WGNSS Nature Photography Group’s quite enjoyable visit to Prairie Garden Trust located in Calloway County, MO. I can’t express how much I appreciate this location and the people that manage it. Lorna and Henry Domke gave our group a personal walking tour around much of their fabulously managed naturescapes – in my opinion the perfect exemplar of how and why to manage natural areas. I thought I would have been back by now, but time has a way of moving too fast and there’s only so many weekends in the year.

Text from their website:

Vision

What the PGT will become

The PGT is a gem of a nature garden in central Missouri where people enjoy strolling by woods with large old trees, prairies filled with a mix of native wildflowers, and ponds and streams rich in native aquatic life. It is free of exotic, invasive plants and animals. Visitors are inspired there to learn about and take better care of nature.

Zebra Swallowtail (*Protographium marcellus*)

Mission

What we do

The Mission of the PGT is to inspire people by letting them experience the beauty of nature found in a variety of enhanced native habitats on the PGT property.

Values

What we believe

Native plants are good for healthy habitats, while invasive, non-native plants are detrimental and should be removed.

We believe that knowing what plants and animals exist here and how they change over time is valuable. We want to avoid harvesting natural resources on the property for income so mature habitats can develop here.

We support removing plants (using fire, herbicides and mechanical means) and animals (by trapping or hunting) as needed for the management of a beautiful habitat and to maintain the balance of nature, but not as a source of income or recreation.

We believe that quiet personal experiences in nature enhance well-being and that crowds detract from that.

Hummingbird Clearwing (*Hemaris thysbe*)

We believe that unmanaged habitats tend to be messy, but they can be made more visually appealing by following an artistic landscape design. By having some areas of the PGT less tended and other areas along trails more tended, we offer a nature garden within a natural area.

We believe that knowing the natural, geologic and cultural history of the PGT property is of value. It’s where a coral reef developed 360 million years ago, where the Ozark hills meet the glaciated plains, where native Americans hunted 2000 years ago and where settlers built a thriving pottery almost 200 years ago.