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At 300mm and above there's always the drop in filter holders built in to the various Nikkor telephoto lens bodies like the 300mm f2.8, 400mm f2.8, 600mm f4 etc...., but they use 39mm and 52mm filters respectively so there's still some finessing required for use with typical 48mm Astro filters, but the mirror is free to move.
Best
JA
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