Focus to target is fine when used with IR illumination , but I’ve had problems being unable to properly focus these 870 and Photon NV units in daylight/twilight time.
I then remembered a little photography tip that using a smaller aperture hole will give a greater depth of field, which should then give me better focus in daylight? To test this out I constructed a circular piece of cardboard with a centre 5mm hole and put this in front of both the 870 and Photon scopes objective lens. It works!
I’ve now drilled 5mm holes in both units objective lens covers, and use a small plastic/rubber plug to fill hole when not in use.
Thought this may be of interest to some users of NV scopes?