High-speed capture reveals Venus near dichotomy after sunset
Burwell's 10,000-frame Venus run shows how poor seeing still yields crisp phase detail when capture is fast, focal length is long, and stacking does the heavy lifting.
Twenty minutes after sunset, Venus was already sliding toward dichotomy, and the seeing was poor. Andrew Burwell’s latest Mac Observatory image shows what disciplined capture and processing can still pull out of bad air.
The capture window that mattered
Mac Observatory’s July 31, 2026 Venus entry, published on Aug. 1, 2026, captures Venus at one of the most useful phases for planetary work: near dichotomy, when the planet’s illuminated shape and limb geometry are especially easy to study. Burwell took the image in bright twilight, when Venus was practical but low enough to demand careful timing. It was never going to be about a single heroic exposure. It was about collecting enough data to let the best moments survive the atmosphere.
Venus is obvious in the eyepiece and on-screen, but visibility is not the same thing as detail. Near-dichotomy phase work depends on getting the timing, focus, and capture run right before the atmosphere starts smearing the image into mush.
Why the frame count changed the odds
Burwell captured 10,000 frames at 347 frames per second using a Celestron EdgeHD 8 and a 2.5x Powermate. That combination tells you exactly what kind of planetary workflow was in play: long focal length, fast burst capture, and enough frame volume to give stacking software a deep pool of data to work with. In poor seeing, that frame count is not excess for its own sake. It is the buffer that lets you reject the shaky moments and keep the brief ones when the air steadies.
The 2.5x Powermate is the kind of optic choice that makes sense when you want Venus phase detail to hold up under processing. A higher focal ratio spreads the image out enough to sample the planet’s shape and atmospheric structure more cleanly, but it only pays off if the capture run is aggressive enough to keep pace with turbulence. Burwell’s 347 fps capture rate shows that the session was built around speed first, then selection later.
A useful way to read the session is this:
- poor seeing meant individual frames were weak
- 10,000 frames meant the stack had plenty of chances to find the least-distorted moments
- 347 fps shortened the time between those moments
- the EdgeHD 8 and 2.5x Powermate gave the image scale needed for phase detail
What the processing pipeline actually did
The capture itself was done in Laminar, and the data were then stacked, sharpened, and colorized in Strata. That sequence is important because it separates acquisition from the finish work instead of treating them as one blur of software steps. Laminar handles the capture side, while Strata takes over once the data are on the machine and ready to be distilled into a final planetary image.
Each Mac Observatory imaging post includes the final image, acquisition details, equipment used, and processing notes. Burwell’s Venus post fits that structure exactly. You can see where the image quality came from at every stage: the observing window, the optics, the frame rate, the stack, and the sharpening pass.
Mac Observatory calls Laminar the first macOS-native planetary imaging capture app; its page was published on Apr. 5, 2026, with a one-time price of $34.99. Burwell also published “Laminar Keeps Shipping: Everything New Since 1.5.0” on July 21, 2026 and “Meridian 1.0 Is on the Mac App Store, and the Beta Is Closing” on July 30, 2026.
How to adapt the method on your next bright-planet session
When the planet is bright but the air is bad, the method leans on speed, scale, and selection. Burwell’s session shows why a long focal-length setup, a high frame rate, and a large frame count can still produce a worthwhile result even when the seeing is poor and the target is only a narrow phase away from full.
The safest way to borrow the method is to think in sequence. First, place the session in the right part of twilight, because Venus near sunset gives you the phase and altitude window you want. Then capture hard and fast, because hundreds of frames per second only matter if you actually collect enough of them. Finish by letting stacking and sharpening do the heavy lifting, because that is where the usable detail gets separated from the turbulence.
Mac Observatory is based in Houston, TX. Burwell is a designer, astrophotographer, and Mac app developer, and he founded the site over nine years ago to help astronomers get the most from their Macs.
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