first saturn images of the season

Oh, and if it wasn't for me, Mike, you wouldn't be vice chairperson

Oh, don't you worry, I won't let you forget that, not by a long shot! In fact, I know EXACTLY who is to blame for all this!

Oh, don't you worry, I won't let you forget that, not by a long shot! In fact, I know EXACTLY who is to blame for all this!

Who?

*innocence divine here*

Seanie,
You need to watch him, he'll be after your job soon... :lol:

No no, it's ok, I enjoy seeing Seanie doing all the work!
As vice-chair, I prefer to "delegate".

Michael,
Getting back to planetery images, I was reading Suiters book on astro scope testing, and came across the

"red edge on one side of the planet and blue edge on the other side of the planet"

phenomena some of us webcamed last year when imaging the planets.

Bad news, it says that this is due to a decentering (sideways shift) of the optical compenents in the scope !!

He was talking about refractors but I'd bet that this translates into SCT scopes also , when you consider mirror flop/image shift etc, you can imaging how.

I noticed that after I recentered the secondary mirror relative to the tube using a vernier calipers, it was not nearly as bad as before, at the time I did this for collimation reasons.

Interesting.
Registax can compensate for it to a certain extent. However, it's obviously best to eliminate it from the optical system where possible.