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82mm / f 6
Optical Design Refractor Diameter/Aperture 82mm Focal Length 530mm F/Ratio f/6
It threads onto the rear cell
but without losing any of the pre-set alignment
the ND96-0
M54 VARIABLE EXTENSION 15 - 18mm ZWO 82mm / f 6This variable length adapter consists of a male M54 x 0. 75 thread on one end and a female M54 x 0. 75 thread on the other. Optical thickness of the adapter can be adjusted between 15 18mm. This is very useful for connecting accessories such as filter drawers or filter wheels to correctors which require a very specific backfocus distance.
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