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hi ben,
you can keep the OAG in there if you like i'd probably move the prism out of view although i'd prefer to use a oag, rather than the finderscope to avoid flexure. but it would be preferable to have an additional spacer instead but the OAG will work.
SGP can focus well. I would be refocussing on every filter anyway, its needed due to temp change anyhow. i usually do it once every 45 mins.
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