I don't know what I can do get a sharper image. The scope was (should have been) well cooled-off--I ran the cooler for 45 minutes, and this was shot after being out for about three hours. Jupiter was 45° up, which is still low but not awful. Seeing was good--the difference between the good frames and bad ones was very small. I tweaked focus back & forth for about 15 minutes, and am satisfied it's the best I can do. I looked at the collimation on Io, and to me it looks spot on. If I push the wavelets any harder I get ringing around the planet.
The only thing I can figure is it's my collimation skills. I get nice round concentric rings on one side of focus, but they're all spike-y on the other. I wonder if the collimation knobs are installed correctly, or if the the secondary is somehow being "pinched."
10" LX200 Classic, 2.5x PowerMate, NexImage, 500 frames (35 seconds) in alt-az
No comments:
Post a Comment