Atmospheric Dispersion

[jambouk]

A really useful article on Atmospheric Dispersion and the use of Atmospheric Dispersion Correctors by Damian Peach has been published on the BAA website under tutorials:

https://britastro.org/node/9058

I'd asked about the use of ADCs on the BAA Forum (https://britastro.org/node/9268) and I wonder if many SGL planetary imagers are using them or have tips on their use?

James

 

[Stub Mandrel]

I suffered terrible AD trying to image Mars last year, I was using a Microsoft Lifecam, so nothing epic. It took a few threads of desperation before someone realised it wasn't my gear it was AD causing the issues

That article inspired me to go back and look. I found the worst affected image, split it to RGB, and it was clear that the G channel was by far the worst affected. So I tried something I hadn't tried last year, I replaced the green layer with a 50/50 mix of the blue and red layers. OK this image won't win any prizes, but it is an improvement.

Before:

The various channels:

After:

[jambouk]

Cool. Interesting idea and nicely demonstrated.

Personally I prefer the original image, but that is related to te colour balance rather than the sharpness of the detail.

James

[riklaunim]

I use it since long time and it allow taking LRGB images of planets (with real L filter and not an infrared passing one).