Quote:
Originally Posted by billdan
As Glen said, the length should be 1.5 times the mirror diameter, any longer and you could get vignetting. However you can flare the dew shield (wider at the front) to overcome the vignetting.
So for a C11 you would need about 16 inches (400mm) in length.
EDIT: They don't help when pointing near vertical though.
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Sounds about right. 450mm which is close to my body length. I flocked mine. Helps with stray light also easier to keep the glass heated. I have a big wire running 12V on the corrector cell on the outside of the scope rim. Here's a
pic of the rig in hyperstar config.