New Posts New Posts RSS Feed - What's with my eyes
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

What's with my eyes

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/08/2012 at 13:20
powderburn View Drop Down
Optics Journeyman
Optics Journeyman


Joined: April/09/2010
Status: Offline
Points: 345
Noted a first time experience for me the other day and was wondering the optics experts here have even experienced or heard of it. I was playing around with my 8x42 binoculars the other evening and was looking thru one barrel at a time trying to get them set just right. I noted that when closing my left eye and looking thru only the right barrel the image would take on a greenish cast while the doing the opposite would show the image in more of a reddish or orange thru the left barrel. the weird thing was if I turned the binoculars upside down so that I was looking thru the different barrels the right barrel would again show a greenish tint while the left barrel was again redder or more orangish tint.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/08/2012 at 16:13
Klamath View Drop Down
Optics Master
Optics Master
Avatar

Joined: May/20/2007
Location: United States
Status: Offline
Points: 1267
Sounds like the coatings, at some point in the system, are different in each barrel.  I'm going to guess they didn't cost a lot either.  Both eyes working together tend to cancel out the effect.  On the other hand it could be that the coatings on one of the objectives is wearing faster than the other side as another possibility.  The effect would be a bit like having sunglasses with each lens a different tint.
 
A way to illustrate this might be to hold the binocular up to a bright white sheet of papar in a well lit situation.  Hold the oculars toward the paper (don't touch the paper) and look through the objectives from a couple of feet distance.  The normal color bias of trhe binocular will show as a slight to definite color tint when you can have the white color of the paper as a check.  See if the same tints show up here as what you see.
 
Probably not your eyes either Smile


Edited by Klamath - July/08/2012 at 16:20
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/09/2012 at 05:30
powderburn View Drop Down
Optics Journeyman
Optics Journeyman


Joined: April/09/2010
Status: Offline
Points: 345
That's sort of what I thought so that is the reason I turned the binoculars upside down and looked thru them so that the barrels were oriented to my eyes in the exact reverse of normal use. Right eye left barrel , left eye right barrel . If it was the coatings I would expect to see the greenish tint move to the left eye however it remained visible in the right eye. Made me wonder if I had a touch of color blindness in one eye. I'll try the white paper test. Thanks
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/09/2012 at 08:04
supertool73 View Drop Down
Optics Jedi Master
Optics Jedi Master
Avatar
Superstool

Joined: January/03/2008
Location: Utah
Status: Offline
Points: 9521
My eyes do the same thing. One seems to show more red while the other is more blue
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: July/09/2012 at 11:53
RifleDude View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: October/13/2006
Location: Texas
Status: Offline
Points: 14313
You're not alone, my friend.  I too noticed the exact same thing a couple years ago and have been puzzled by it ever since.  At first, I thought I had a problem with my bino, so, like you, I rotated it upside down and the color bias stayed the same in each eye.  I tried it with 2 other binos... same thing.  The degree to which I was able to see this color difference depended somewhat on the lighting conditions and my viewing angle relative to direct sun.

I have no explanation either, but when I look through both barrels in normal use, the world looks normal, so I don't worry about it.  If I had to guess, I'm betting it has something to do with sunlight reflecting off lens coatings (that have varying tints themselves), and one objective lens is receiving more light than the other when viewing at an off-axis angle to the sun.  Perhaps the fact the lenses are inset into the objective barrels and the outer lens surfaces are parabolic, one is more shaded from direct sunlight than the other depending on viewing angle.  This is a total guess.  Try repeating the same test while viewing at different off-axis angles relative to the direction of the sun and see if the same color biases always follow the same eyes. 


 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "What's with my eyes"
Subject Author Forum Replies Last Post
Big Eyes bracket for Swarovski??? Sam11 Spotting Scopes 4 6/21/2005 12:13:57 PM
Steiner 25x80 big eyes? kokdyer Spotting Scopes 4 9/1/2004 11:24:18 PM
Are my eyes broke? jtslammin Rifle Scopes 4 11/24/2004 6:10:32 AM
Bad Eyes frankx45 Rifle Scopes 2 6/13/2007 3:02:02 PM
EYES kapt Rifle Scopes 0 6/19/2007 7:08:45 AM
Old Eyes Sandracer Rifle Scopes 8
old eyes and scopes Anthony Rifle Scopes 5 10/13/2006 12:13:09 AM
Eyes not as good as they use to be nightranger Shooting 29
two scopes / two eyes / too funny Rich Coyle Rifle Scopes 63
What was going on with my eyes? slowr1der Rifle Scopes 13


This page was generated in 0.188 seconds.