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Pentax 67 400mm EDIF F4 lens. You can probably get an extender as well.
Pentax 67 lenses have he most backfocus of any lens and they are quite sharp and relatively inexpensive for their aperture.
I have a Pentax 645 300mm EDIF F4 plus a 1.5 extender. I have used the 300mm lens extensively for imaging and its a great lens. It has double ED elements. What would that be worth in a regular telescope?
Greg.
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