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Off axis masks
I have suggested to a member here to use an off axis mask on his large reflector in the early evenings, when the seeing can be unsteady and a smaller aperture can be more useful.
Tried to pm some photos without result, hence this post.
Despite what many other commentators have said, I find my mask veru useful in resolving double stars clearly, which at full aperture can appear as bright blobs. The other night I had the mask on and the definition and clarity of the E & F stars in the trapezium were outstanding. Without the mask the C star tended to burn out the F and the separation was not as distinct.
As I have said before, this mask is so good for most doubles that I sold my AP 130EDT - I have a 7" F11 premium Apochromatic refractor inside my 18" SDM
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