Quote:
Originally Posted by astro744
Straight through will be upside down and for terrestrial that is not ideal. Also without diagonal in place an extension tube may be needed. Not sure if the TV-60 will come to focus without diagonal or extension; I'll have to try it.
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That's correct, so depends on priorities.
Yes the length of the diagonal's light path will have to be replaced by an extension tube or compensated by the focusser.