The ring doesn’t turn much anyway. And sometimes I can see it help; other times the difference is not noticeable.
I’d say it could be handy for getting the crispest photograph in some cases. In other cases, or for non-photos, it really doesn’t make much difference in helping identify temperature differences.
In other cases, or for non-photos, it really doesn’t make much difference in helping identify temperature differences.
That was my thinking when I bought the older, cheaper model — the resolution of these thermal cameras is so low I figured the focus wouldn’t make any difference.