M42 VARIABLE EXTENSION 15 - 18mm Kit The unequally larger

The unequally larger

75 male thread

but requires the Focuser Retrofit Kit for RASA 11

The ASI432MM has a HCG mode which effectively reduces readout noise at high gain settings while preserving the same wide dynamic range that you would get at low gain

25" BA2961500 SKU 31 mm BA2961501 SKU 36 mm BA2961502 SKU 2" BA2961503 SKU 50

M42 VARIABLE EXTENSION 15 - 18mm Kit The unequally largerThis variable length adapter consists of a male M42 x 0. 75 thread on one end and a female M42 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. Specifications Optical length 15 18 mm Clear aperture 38 mm Outer diameter 56 mm Connection side A Female M42 x 0.