During use of heavy photographic instruments like DSLR or cooled cameras (often with filter wheels), it's crucial to avoid flexures when we insert them into the telescope's focuser. This also important for visual use using large mirror diagonals and wide field eyepieces (which are often very heavy). That's why we designed the OnAxisLock2 adapter that replaces the classic screw with a locking ring system. This allows you to perfectly lock the inserted accessory by rotating the outer ring (red): a special double ring tightens internal accessories with an uniform pressure. The OnAxisLock2 device also allows you to keep perfectly aligned the accessories inserted in the focuser: so you will be sure that your camera's sensor will be perfectly centered with the optical axis of the telescope.
OnAxisLock2 50,8mm visual back for ESATTO 2" or ARCO 2" is screwed directly to the M56 thread of ESATTO 2" focuser or ARCO 2" rotator and lets you connect the 50.8mm diameter accessories.
So it's perfect both for visual and photographic use: you can connect also heavy eyepieces and diagonals, or you can iconnect any camera provided with 2" nose screw.
The particular locking mechanism also avoids spoiling the inserted accessory because the pressure is evenly distributed in the barrel. With the classic screw locking system instead the stress is instead carried on a small area and this can easily spoil the barrel.
The special design of the outer ring has been developed to allow you to lock the accessory with ease, even when wearing gloves. This way you can be sure to safely lock your CCD camera or your eyepiece even when the cold is intense.
