POI shift spec’ulation
Two things about glasses: I did an experiment because my distant vision is fine, but I wear glasses for close-up work so I have varifocals. I shot a few targets at 30 yards with my glasses on – all fine – and then shot a couple of groups with glasses removed. To my surprise, I had a 1cm group shift to the right – I am a lefty – so I put my glasses back on and the group returned to the original position! Also, I have transition lenses and they are a bad thing for airgunners, in my opinion. When I need them most, I’m sitting in my car and they don’t work due to the windscreen UV filters, so if you are going to do FT or HFT, do not use transition lenses. You can sit
in the sun, the target also in the sun, with no problems, but your next target might be in a heavily shaded area whilst you are still sitting in the sun; your glasses will still be maximum dark brown and you will struggle to see it.
Going back to point one above, if you remove your glasses for this shot so you can see the target, you will probably miss it and wonder why – POI shift. Peter Finch
Do our spectacles cause POI shift? Peter Finch believes so