Quote:
Originally Posted by PRejto
Hi Rodney.
Well, obviously something is wrong with either the design of this petzval APO or this particular example. How disappointing!
A wild guess, might your Astronomik blue filter be transmitting more UV than a competitor's filter? The UV might not be within the corrected range of this APO.
As a temporary cure, try running BlurXterminator on just the blue channel. You can set it only to correct star shapes and not deconvolve.
Good luck,
Peter
|
Quote:
Originally Posted by kencas
When toggling between the images I can also see a slight shift in the green channel. The red is perfectly circular, the green is showing some centre weighted abberation, and as you have pointed out the blue is quite elongated.
|
Peter, Ken, thanks for your responses. I would like to get to the bottom of this and see if I do have an issue with the OTA or not. As a first stab I will try with adjusting out the small amount of tilt that is there and see if that makes a difference.