M54 VARIABLE EXTENSION 15 - 18mmThis 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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