I have an Alpex LRF that I use in the same manner you are planning to - for those magic hours when you know the deer are there but a normal scope isn’t quite good enough.Thinking about a night vision scope for deer. I haven't decided on which model but will be between hikmicro and dnt zulus.
Use will be on clearfell for the hour before dawn, hour after dusk, laying out rather than wandering round looking for a target. All shots likely to be well under 200m.
I know the ground pretty well so can I get away without the rangefinder function? I might have answered my own question
I don't have a rangefinder built into my thermal.
Does the rangefinder bring an element of flexibility or is it a function that seems useful but doesn't get used in the real world?
I use mine for fallow & typically that means sitting up watching open fields & woodland edges with shots that often exceed 200 yards so I find the range finder a very useful function.
However, if I knew I would always be shooting no more than 200 yards I would simply zero at 200 & get on with it on a ‘point & shoot basis’. All my glass scopes are zeroed at 200 yards & over the years I’ve never had any issues with that causing problems if I take a shot at 100 yards or less - at 100 yards all that happens is the bullet hits 2” or so high. If you’re at all worried then simply aim a little lower if the deer is only half way across your 200 yard clearfell opening.
Hope this helps you decide.