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Astrophotography

Atmospheric Dispersion Corrector Initial Results
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Thanks, Gary!

Thank you, Lou!

That's very encouraging news about the ADC and very nice image of Saturn Joe!  Thanks so much for posting the image and taking the time to describe your experience.  I'm even more motivated now to get my planetary rig fired up and to try out the ADC.

Clear skies,
Gary


Great work Joe! I love it. Lots of nice detail. That ADC sure makes a difference.


-Lou



Canon EOS Rebel XS (full spectrum mod)

Astronomik CLS CCD

Orion thin off axis guider

QHY5L-II M guide camera

Celestron CGX,Edge HD 8,0.7x focal reducer

Optec TCF-Leo focuser

Hi all,


The attached (from early this morning) is the result of my first real attempt to use an atmospheric dispersion corrector (ADC) by our recent speaker, Agapios Elia, and others for reversing the refractive effects of our atmosphere. My impression that the device does seem to make a difference. The image is from a single one-thousand frame video. It was an unbearably hot evening, but I was able to take two of these, before some (heat related?) spookiness occurred with my mount's slow-motion controls.


Impressions: The ADC eliminated almost all of the refractive effects. I was able to neutralize most of the rest by slightly shifting the color channels in Photoshop. The result represents an improvement for me, not so much from a standpoint of resolution, but from the relative absence of weird edge artifacts, which baffled me in the past. Were they, in fact, the result of RGB shifts? Anyway, I am looking forward to further experimentation, and the opportunity to more closely emulate Agapios' capture routine.


Enjoy the rest of the summer!

Joe


Details: Seeing: Average, Celestron 11, ZWOASI462MC, ZWOADC, IR cut filter (Saturn's altitude: 34 degrees)

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