Page 1 of 1
Front Sight Lens Question
Posted: Wed Mar 11, 2015 11:54 am
by Paul
As I wanted to give it a try in our any sight smallbore prone matches, I bought a 1.5X foresight lens for my Centra DUO-Glass front tunnel. It's a 22mm. As I use a bloop tube, the distance between my front tunnel and my rear sight is about 41''.
Even when I crank up my front sight iris to its maximum (5.8mm !) I just can't get enough white around my bull. Is it because a 1.5X lens is too much ? Should I try a 1.3X ?
Thanks for your help !
Paul
Re: Front Sight Lens Question
Posted: Wed Mar 11, 2015 12:25 pm
by Cumbrian
Can't comment on the 0.3 lens idea, I'm afraid, but I can tell you that I tried something very similar recently - 22 mm Centra Vario and 0.5 lens on a standard Anschutz 1800 barrel with 8 inch extension tube - and found that I needed a 6.9 aperture, or something very close to that (I didn't have time to experiment very far), to get enough white to suit me. I was surprised at the effect another 8 inches had because normally I use an aperture in the 5.0 - 5.5 range, but of course those 8 inches are a fair percentage increase on the normal length between foresight and rearsight. I was using a Rightsight, which offers a much wider aperture with its 30mm Gehmann sight. You may need to invest in a standard Centra foresight with the appropriate size insert, which is annoying for those of us that have already shelled out for a Duo Vario.
Re: Front Sight Lens Question
Posted: Thu Mar 12, 2015 7:34 am
by patriot
Installing a lens in front of the iris requires a larger opening. The length of my bloop tube was determined by the largest opening of the largest Rightsight iris giving me the white I wanted. Would it help to install the lens on the shooter side of the sight?
Mark
Re: Front Sight Lens Question
Posted: Fri Mar 13, 2015 12:30 pm
by mobarron
It's interesting how different we are. I'm confortable using Centra fixed clear apertures at 5.2 and 5.4 with an 8" blooptube. Mike Barron
Re: Front Sight Lens Question
Posted: Sat Mar 14, 2015 2:42 am
by KennyB
patriot wrote:Would it help to install the lens on the shooter side of the sight?
Mark
No it wouldn't . Either way the lens would be so close to the iris that the magnification would be near as dammit 1x so it shouldn't matter which side of the iris/element the lens is on - as far as the size of opening is concerned.
The target is all that's magnified.
Ken.
Re: Front Sight Lens Question
Posted: Sat Mar 14, 2015 7:21 pm
by redschietti
Ive tried target and shooter side of front sight and thought there was a significant difference
Re: Front Sight Lens Question
Posted: Mon Mar 16, 2015 9:03 am
by Cumbrian
redschietti wrote:Ive tried target and shooter side of front sight and thought there was a significant difference
Can you elaborate on this, please? Which side gives the better magnification?