The current ir gives a good image to about 35yds, them dims quite a bit, which I pretty useful for holdover! I'm sure a T20 could get a better range though but this one cost £12 lol.
The camera is attached with a 40mm proplast coupler from screwfix, fits Hawke and mtc scopes well. The camera is wrapped in leather to centre it and give a snug fit in the coupler