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Adapter from M81 to M57 with stop ring for ESATTO 3" allows you to connect any camera or accessory with M57 female thread. Just thread this adapter to the M81 thread of the ESATTO 3" draw tube. Thanks to the M57 stop ring for ESATTO 3" you can also fix the camera at a precise angle in order to better frame your camera sensor at the desired object.

Optical length of adapter from M81 to M57 with stop ring for ESATTO 3" is 4mm (1,5mm adapter + 2,5mm stop ring).