I guess I'm old fashioned. To me, the idea of a range finder seemed like cheating.
I think there is a legitimate place for range finders as judging distance over 100 yards
can be problematic. Over broken ground with multiple elevations, 267 yards can look like 375 & visa versa.
However, the fact that someone would need one to tell the difference between 10 & 20 yards, or anything under 25 yards ... leaves me utterly dumbfounded. If you need a range finder for those distances, or have to pace them off before you hunt & mark the landscape ... you need some old fashioned practice
at the range ... or even your backyard if possible.
I just read where OHhunter bagged his umpteenth Coyote. Now a moving Coyote is not a very big target & you can see from the picture, he hit him plumb dead center. I'll bet if you check with OHhunter he will tell you he didn't use a rangefinder, he didn't pace off that Coyote & he didn't wait for the critter to get next to a tree he already measured off.
gave him the experience to instinctually know how far away the animal was & where to hold on him. I think we do a disservice to new hunters when we don't advise them to just practice until taking a shot comes naturally. What are they going to do if they're moving & have 2-3 seconds to take a shot? There are no marked trees .
The answer is practice. Practice at targets of varied distances and as you suggested, estimating distances to objects you come across during the day. I also recommend squirrel hunting. They're small & come at all kinds of distances & are generally moving. If you get to where you can always hit a squirrel, you'll have the confidence to hold on a deer without hesitation. After all, hitting a deer is no where as difficult as hitting an X ring. [:)]