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Rob, I had a relisation today that my camping mat shield using tap is not hold a circular shape very well. What I thought was a collimation issue yesterday was infact vigneting from an out of shape shield. Firs thing tomorrow I am going to reduce the size a bit. Its 600mm total but only about 450 hangs out from the corrector. This is more than I need as it should in theory only be about 300-400 for my scope. I will cut of a bit and see if it helps. But the main issue is the tape has a crease where the two ends meet and this cause it to bend inward. The collimation ring pattern looks like it sqaushed a little on one side, but the centre rings are fine and the black spot is dead center. How do people brace there shields? And avoid inward bends?
Your the second person to suggest a Manila folder version to me. thats a very neat solution, how well does it hold its circular shape. Maybe I can brace mine with some flat black thick cardboard inside.
Regards
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