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One of my scopes has a zoom/range function from 4x-12x.From 4x-9x the image is nice and clear but from 9x-12x the image blurs, not massively but enough to be annoying, but the reticle stays in sharp focus at all settings.There is no parralax or focus adjustment on the scope and nothing seems loose inside the scope, nothing rattles and the zoom functions flawlessly.
Is it a foible of the scope, my eyes or something else?.

Incidentally it is a Russian 1pn21 scope with a 54r calibrated bdc, the "4" setting corresponds to 400m, "5" to 500m and so on......the further the range the higher the magnification setting out to 1200m.

snayperskaya wrote:One of my scopes has a zoom/range function from 4x-12x.From 4x-9x the image is nice and clear but from 9x-12x the image blurs, not massively but enough to be annoying, but the reticle stays in sharp focus at all settings.There is no parralax or focus adjustment on the scope and nothing seems loose inside the scope, nothing rattles and the zoom functions flawlessly.
Is it a foible of the scope, my eyes or something else?.

Incidentally it is a Russian 1pn21 scope with a 54r calibrated bdc, the "4" setting corresponds to 400m, "5" to 500m and so on......the further the range the higher the magnification setting out to 1200m.

Rich, I have seen this on some lower cost scopes. I was wondering if the internal alignment was not up to snuff which might cause more obvious abberations at the higher mags, or, they may be there but just not visible at the lower mags. Zoom and variable focus takes a lot to get absolutely right accross the board and a lot of perfectly ground and aligned glass. We tend to use fixed single distance lenses and interchange, better all round at known fixed distances.

That said, there is a higher mag version of the Sightron I use which I have heard mixed reviews about at full mag, but not so with its 8-32x sibling. Some have said they wished they had bought the 8-32 while others rave about the 50x (?). It could be that peoples "Visual processing" is so subjective, it could be scope or difference in eyesight.

I would never take anyones recommendation as being enough to buy glass, you have to try before you buy (and even then).

I guess on that particular Friday Sergei in quality control had hit the AL11 early

Thanks for the reply . To be honest it is perfectly useable as it is only at high zoom/long range that it blurs and I got it more for its rarity than as an everyday scope, for that I have the PSO-1.