Quote:
Originally Posted by cometcatcher
That's not a knife. THIS is a kn... I mean CA.  Taken with the infamous Long Perng ED90 doublet.
Be sure too your camera settings don't contribute to it. At first I thought my SW ED100 F9 had CA, but it was actually a setting in the camera that was causing it. Since I sorted that out, CA isn't an issue. Flare on the other hand....
I'm not familiar with that model of WO scope, but I have read that some of the doublets do have a little residual CA. If you push them hard enough, most refractors will show it. If it's minor CA like yours, a fringe killer will deal with it, as will a Semi-Apo filter. The Semi-Apo is a good filter for nebula as well. |
There's a reason why your stars lose colour when stacking - you are increasing the total range within the image so the variation in levels at the very top end is too small to see without stretching this region. You can recover this just fine in tools that let you increase vibrancy and saturation. You're not actually losing anything, you just have to know how to make it available again.
Hope this helps,
Cam