Doubles to test Optics
Posted 20 February 2013 - 11:17 PM
What are some good doubles to try to split using my C11 to test it's optics? The shadow on one side of focus is not the same as the other side for the same given amount of focus travel. I believe this indicates SA. Wondering what a double star test would prove?
My Orange C8 is pretty much identical on either side. Rings look practically identical too, unlike the C11. The AT6M blur circles look like the C8's. Wondering if I got a so-so C11. Like to try a C8HD and put it on my EQ5P but not sure I want to roll the dice anymore with SCT's.
Posted 21 February 2013 - 05:53 PM
As WRAK suggests, you're better off doing a star test on the scope. Because it is an SCT, collimation will be absolutely critical for double star performance. Slight miscollimation will stack with any thermal issues and aperture-related seeing challenges, and cripple the scope's potential for splitting doubles.
Posted 22 February 2013 - 09:27 AM