After doing a few nights of star testing and speaking to more experienced observers , I've come to the conclusion that my 10" F4 exhibits a turned edge. My question is how much should I mask down the diameter? Down to 9"? I was going to use a heavy black poster board close to the mirror face that would rest on the clips. Thanks for any thoughts on this. Allen
Edge Masking Primary
Started by elfy46, 10/04/2009 07:03AM
Posted 10/04/2009 07:03AM
Opening Post
Posted 10/06/2009 02:02AM
#2
I have masked down my 8" f/6 primary by 5mm and changed the 50mm flat to a 44m flat. I saw signs of TDE. The scope was very good but now I consider it as almost perfect 
Next step is ordering a Howie Glatter lasercollimator so I don`t have to bother with collimating by hand under the stars. This was an advice from my fellow Swede collimation guru Nils-Olof Carlin.
BTW this night I had a rather fine view of Plato and 4 distinct craterlets, also the bottom on Plato looked like a grainy sandpaper.
-Magnus
Next step is ordering a Howie Glatter lasercollimator so I don`t have to bother with collimating by hand under the stars. This was an advice from my fellow Swede collimation guru Nils-Olof Carlin.
BTW this night I had a rather fine view of Plato and 4 distinct craterlets, also the bottom on Plato looked like a grainy sandpaper.
-Magnus
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