Specifically-
"We then tested the same thing with the focus, going from a close focus all the way to infinity and back several times to see how it did. Our results revealed an issue that we often find with scopes that try to focus the parallax in too close. The reticle was pretty solid from the focus range of about 30 yards to infinity, it drifted maybe a total of .5 MOA through that entire adjustment range. But from the 30 yard focus down to its closest, at about 9 yards, the reticle shifted at least one full MOA, if not more. This seems to be an issue on any scope that tries to have that super close focus range. This is a big reason why we would prefer that they not do this and instead have a parallax focus that starts at 50 yards and goes to infinity. It’ll be more precise and they could allow for a knob to rotate the same amount and then giving finer granularity. This issue is not critical since for sniping purposes we are always shooting at ranges beyond 50 yards so the drift doesn’t effect us, it just seems a bit wasted."
Full article here-
http://www.snipercentral.com/sightron-s-tac-3-16x42mm-full-review/
NOTE that they explain problems of AO (side focus) made for under 50 yard with reticle shift.
This $500.00 scope is made in JAPAN !
CA
"We then tested the same thing with the focus, going from a close focus all the way to infinity and back several times to see how it did. Our results revealed an issue that we often find with scopes that try to focus the parallax in too close. The reticle was pretty solid from the focus range of about 30 yards to infinity, it drifted maybe a total of .5 MOA through that entire adjustment range. But from the 30 yard focus down to its closest, at about 9 yards, the reticle shifted at least one full MOA, if not more. This seems to be an issue on any scope that tries to have that super close focus range. This is a big reason why we would prefer that they not do this and instead have a parallax focus that starts at 50 yards and goes to infinity. It’ll be more precise and they could allow for a knob to rotate the same amount and then giving finer granularity. This issue is not critical since for sniping purposes we are always shooting at ranges beyond 50 yards so the drift doesn’t effect us, it just seems a bit wasted."
Full article here-
http://www.snipercentral.com/sightron-s-tac-3-16x42mm-full-review/
NOTE that they explain problems of AO (side focus) made for under 50 yard with reticle shift.
This $500.00 scope is made in JAPAN !
CA