This tube is designed to replace the sytong HT-66, HT-660, HT-77, HT-77LRF HT-770 tube.
This unit will not work alone as it has to be connected to our Universal Scope Holder USH-46.
Made of aluminium.
The size of thread is m42 x 0.6 pitch
This unit will not work on any scopes with shorter ocular less then 25mm between the end of the ocular and the reticle illumination control.
1. Have the SYG-77 & EVC adapter connected, then slip them over the eyebell and tighten almost fully.
2. Digitally zoom-in the add on to ×3.5, look through it and manipulate the add on until the reticle on-screen is centred both horizontally and vertically.
3. Now fully tighten the EVC adapter.
…it can still pivot slightly, with the multiple ‘fingers’ of the adjustable collet acting like a slightly malleable ball-joint, for fine-tuning.
4. Now back-off the zoom to 0x and you have a perfectly centred add on /scope setup.