Jump to content

sgl_imaging_challenge_2021_2.thumb.jpg.72789c04780d7659f5b63ea05534a956.jpg

ZWO Atmospheric dispersion corrector question.


Recommended Posts

"Yes" - contrary to what some think the effects of atmospheric dispersion are not just the shifting of the colour channels in an image. if it were then a simple channel alignment application in Registax6 etc would solve the problem!

There is "dispersion" within each channel such that the quality of each in an image is affected to the detriment of resolution (think of it as a kind of "blurring" of the details)...a Wratten #47 filter can be used to set it with a mono camera but all of our Mars images this year here https://stargazerslounge.com/topic/364851-35-days-of-mars/   where the planet was mostly around 49°-50° used an ADC & a mono camera.

Fortunately for us we have both the ASI462MC (colour) & ASI290MM (mono) cameras which each have similar pixel-sizing in the sensors & are thus parfocal, so we could set the ADC with the colour cam & then swap in the mono cam for our imaging captures. ;)

Pretty soon we realised the lever separation of the ADC was a constant amount of 1 gradation either side of the slip ring over the period from about 1.5-2 hours before & after culmination of this planet...so we did not need to use the colour camera at all after the first few trials...merely setting the levers at that separation with the centre-reference horizontal on our C14 at the start using only the mono camera...& re-adjusting every 15 minutes to keep the centre-reference horizontal via its bubble level & re-adjusting the levers either side of it to maintain that 1 gradation separation. ;)

Edited by Kokatha man
  • Like 4
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.