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Hole punched in scope caps?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 10:51
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Does anyone know why some military sniper pictures show a hole punched in the center of their scope caps?  I have to assume that it is to allow a quick point blank shot during stalking when the covers may be closed?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 10:55
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They allow for the scope to be used at shorter ranges. This is a technique employed for the use of bore sighters as well. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 11:36
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I always thought that it was for protection of night vision attachments. I have no background but the same type of small hole is used on night vision to cut the amount of light to keep from overloading the tube in night vision devises. So I learned something here. Thanks Cyborg
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 11:55
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it acts to reduce glare in bright light, and increases the depth of field considerably on higher mags, where some is usually lost. it does exactly the same thing as an iris in a camera lenses by "stopping down".  Burris had a line of scopes that had a built in iris about 15 years ago.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 12:11
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Thanks guys,
Is there a standard hole size?  Is it only done to the objective cap?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 15:16
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It is done to the objective only. Tens, and Dale, brought up points that I hadn't even considered. I'm such a SLACKER....Bucky  I'm unsure of the exact hole size but I believe it to be 3/16 inch.

Edited by cyborg - July/01/2008 at 15:20
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 16:39
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All good info!!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 16:41
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Originally posted by Dale Clifford Dale Clifford wrote:

it acts to reduce glare in bright light, and increases the depth of field considerably on higher mags, where some is usually lost. it does exactly the same thing as an iris in a camera lenses by "stopping down".  Burris had a line of scopes that had a built in iris about 15 years ago.

 
Thank you, Mr. Clifford.
I didn't know that either.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/01/2008 at 19:21
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Thanks for all the help guys.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/02/2008 at 09:09
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actually you can use a rectangle and get the same results. any size hole will have some results, but you reducing the exit pupil dia. accordingly. this is an ad hoc fix not a recommended thing, the reason a pin hole camera's picuture is in focus, (pin in the side of a box) works is because the small pin hole gives a very large depth of field in relation to the size of the film negative being used.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/10/2008 at 17:27
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 I learned another good fact !  I just don't know if my skull is big enough to hold all the extra knowledge that's probably going to make my head swell even bigger ...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/10/2008 at 17:36
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there are other answers of course
and it is the military so
the lens caps are frozen shut
too lazy to clean the lens, just cover it
great chick magnet
do it now so you won't have to do it later.
so you can sleep in.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/24/2008 at 16:51
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Originally posted by Dale Clifford Dale Clifford wrote:

there are other answers of course
and it is the military so
the lens caps are frozen shut
too lazy to clean the lens, just cover it
great chick magnet
do it now so you won't have to do it later.
so you can sleep in.
 
Roll%20on%20Floor%20Laughing
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2009 at 23:38
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I always thought that was to prevent the scope from casting a reflection/glare and giving away the sniper's position. It's interesting to know there are other reasons. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/12/2009 at 08:33
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 I've never encountered that, and learned some very interesting things this morning!
 Thanks guys!
 
 I love this site!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/07/2009 at 19:26
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Originally posted by cyborg cyborg wrote:

It is done to the objective only. Tens, and Dale, brought up points that I hadn't even considered. I'm such a SLACKER....Bucky  I'm unsure of the exact hole size but I believe it to be 3/16 inch.
 
Yeah, slacker, get offf the bucket! Smile
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