Quote:
Originally Posted by swannies1983
Mario, this is rather perfect timing as I posted something a few days ago asking about reflections with my new RC8. I also imaged the Horse Head. See here. I was imaging with a dslr and also got the airy disks around/near Alnitak. They aren't as strong as yours because your contrast is much more than my image. It was suggested that it might have been from the LPS filter.
I have collected more data from when I took that image and am now up to 30x5mins. I started processing the image last night. |
Dan,
I knew I'd seen some mention of something like the problem I was having but for the life of me I couldn't remember where! And guess what, I attach my UHC-S filter to my camera using the same adapter that you use!!
In the business I'm in - seismic processing - we get secondary bounces of sound called multiples - these are sound signals that are either bouncing of the water bottom or within coal horizons. It makes sense that if the light is bouncing between the filter and the glass of the camera that the focal length will have changed and would then look like an out of focus star. However I'm not sure why it is offset from Alnitak rather than centred around it?
Now if there was some way to tame these light multiples....
Cheers,
Mario
Edit: What about a light bounce off the front of the filter up to the secondary and then back down to the camera?