sytong HT-66, HT-660, HT-77, HT-77LRF HT-770 Ring Tube

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

Length: 19mm

Please note:

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.

Setup instructions:

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.