SWFA eye relief

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Hookster

Hookster

Member
Sep 19, 2017
641
19
NY, United States
So I bought a fixed 20x FWSA SS scope for my new FX .25 Compact. Love all the features and size of the scope however, the eye relief has a very tight distance. If I move my head a mm in or out the scope washes out. Has anyone else experienced this? Normally there is a enough room to move some. Not the case with mine and taking shots while hunting has proved difficult. Any help would be great.
 
Don't confuse eye relief with exit pupil.

The fixed 20X has a tiny 2.1 exit pupil... not good for hunting, however, it's good for long distance bench rest shooting. Whereas the 10X has double the pupil size (4.2) much better for hunting/plinking anything inside 100yrds.

For exit pupil size, simply divide the objective size/power. 42/20 = 2.1.

I need at least 3.8. for my 53yr old eyes.
 
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"Oregun"Don't confuse eye relief with exit pupil.
The fixed 20X has a tiny 2.1 exit pupil... not good for hunting, however, it's good for long distance bench rest shooting. Whereas the 10X has double the pupil size (4.2) much better for hunting/plinking anything inside 100yrds.
For exit pupil size, simply divide the objective size/power. 42/20 = 2.1.
I need at least 3.8. for my 53yr old eyes.
Click to expand...

Thank you for explaining the exit pupil calculation! I'm shopping for new glass and that's a spec I've been considering.
 
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I had the same problem "milky cloudy issue" with my 16X42 SWFA mounted on a springer. I could only fit one sun shade on it, and still have room to break the barrel and that did not solve the problem. I was sick about this so I got to thinking DANGERS if there is too much light coming in why not make a smaller hole for the light. I cut a hunk of gray foam to fit in the end of the sun shade with a one inch hole in the center closing it down from 1 3/4 in to 1 in. Call it redneck engineering or what you will, it worked fantastic. Now I can shoot all day without any aggravation or headache caused by blurred vision, bright clear picture on a great scope.
 
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"Hookster"Thanks for the heads up. The bummer is I wanted a more compact streamlined scope for my FX Compact. Now I need to put a sunshade that can be measured by the foot doesn't make me smile. I will give a couple more shades a try but if it looks too ridiculous the SWFA will be replaced pronto.
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Try to find a honeycomb glare filter for the scope. They don't need to be near as long as the tubular shades.
 
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Some damn fine ideas, thanks. I will look for a glare filter and I have a bunch of closed cell foam I can play with as well. Thanks for all the suggestions and I will post what worked best. So got home today and cut a circle of black foam and it appears to have done the trick. I have an anti glare screen coming but thanks to you all for the help. Much appreciated.
 
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SHAZAM! This thread explains a lot of the problems I have been having with medium/higher den scopes. 

I had great success with a Athlon Talos BTR 4-14x44 and a Talos 6-24x50. They were great - a bit dim, but I could read the text on a 10m target clearly at 14 to 16x power. So I upgraded to a Athlon Argos 6-24x50 and it was very clear and bright, but not as clear as the Talos 6-24x50 for some reason. I was going to purchase a SuperSniper 16x, but got scared off by the milky issue. I purchased a Athlon Midas 2.5-15x50 instead - ugh! I could not read the 10m target - blurry and "weird" I sent it back thinking it was banged around in shipping as the box had no packing and was severely damaged. The replacement was better - really bright and pretty clear, but not as clear as the cheap Talos 6-24x50. I could read the 10m target, but it was not as good as the cheap Talos 6-24x50. 

Following this thread, I tried adding a ring of foam to reduce the ocular diameter and the amount of light - BINGO - the image was much clearer, although noticeably less bright. I have a sunshade coming and may try to make a flashkill to help with this problem. This also explains my Hawke 4-16x50 Airmax problems as well. We should start a sticky thread on this issue.

Daniel Putz 
 
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I'm glad my silly idea foam light restrictor is working for some folks. I have since found a rubber grommet the right size fits inside the sun shade firmly, reducing the hole to just under 1 1/4 inch seems to be good size for a clear image. Although the image is clear it is not as bright as I would like but a big improvement. There are several ways to do this, I just used what I had on hand.
 
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