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Thanks for the comments everyone; I was actually thinking from the point of view of framing of various sized DSOs. I am aware of the different ways of using barlows to vary the magnification, a good example being whether it is put before or after a diagonal. What about a zoom
barlow that telescopes and has a twist lock that you nip up at the
desired position, you'd only need one 1.25" and one 2" to cover all your needs. Just thunking [dangerous, I know].
raymo
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