Need Astigmatism Correction for F class ?
Posted: Sat Oct 24, 2015 6:15 am
Just thinking about buying a new F class scope and wonder if anyone can comment whether astigmatism will present a focus problem, and if so, how is it corrected ?
I shoot mainly full bore and use a correcting lens in my rear sight, the front sight is in focus and the aiming mark is almost in focus (that's the trade-off). I use a 0.5 eagle eye. If the correcting lens is not rotated to the correct axis then notwithstanding having the correct focal adjustment in the rear lens, the sight picture is not as good as it could be. This is why the rotation is needed, to bring it all together.
So, back to the scope. I used to have a Leupold Mk 4 mainly for load testing and the odd short range tac. match but sold it a few years ago to concentrate on full bore matches. My distance script is -0.5 and close up it is +1.5 dioptre. Axis to correct astigmatism is 140.
I have looked through a few scopes but not for any extended period. A few mates shoot with prescription glasses but I'm trying to avoid this.
Thanks.
Martin
I shoot mainly full bore and use a correcting lens in my rear sight, the front sight is in focus and the aiming mark is almost in focus (that's the trade-off). I use a 0.5 eagle eye. If the correcting lens is not rotated to the correct axis then notwithstanding having the correct focal adjustment in the rear lens, the sight picture is not as good as it could be. This is why the rotation is needed, to bring it all together.
So, back to the scope. I used to have a Leupold Mk 4 mainly for load testing and the odd short range tac. match but sold it a few years ago to concentrate on full bore matches. My distance script is -0.5 and close up it is +1.5 dioptre. Axis to correct astigmatism is 140.
I have looked through a few scopes but not for any extended period. A few mates shoot with prescription glasses but I'm trying to avoid this.
Thanks.
Martin