Bullseye-L Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.

Nygord’s Notes on Iris and clip on lenses

3 posters

Go down

Nygord’s Notes on Iris and clip on lenses  Empty Nygord’s Notes on Iris and clip on lenses

Post by RodJ 12/4/2021, 3:23 pm

Can someone help explain the “Champion” system that Mr. Nygord describes in his notes The Eyes Have It?  I count your basic lens (my regular prescription lenses, which I’m guessing are my ARS distance lenses, not Rx reading glasses or bifocals) on top of which there is a clip on lens of +0.25 to +0.50 diopters high is part of the system, then a separate iris as well?  Not sure I follow how it all works together.

Anyone have a picture? Is this still made?


http://www.cincinnatirevolverclub.net/nygordsnotes/eyes.htm

RodJ

Posts : 253
Join date : 2021-06-26

Back to top Go down

Nygord’s Notes on Iris and clip on lenses  Empty Re: Nygord’s Notes on Iris and clip on lenses

Post by shanneba 12/4/2021, 4:42 pm

Reading the link it looks like he is talking about these:

CHAMPION SHOOTING GLASSES SYSTEMS (precision-sports.com)

shanneba

Posts : 83
Join date : 2021-10-16
Age : 65
Location : Indiana

Back to top Go down

Nygord’s Notes on Iris and clip on lenses  Empty Re: Nygord’s Notes on Iris and clip on lenses

Post by james r chapman 12/4/2021, 5:06 pm

Or Knobloch K5

https://www.knobloch-schiessbrillen.de/K5-Shooting-Glasses
james r chapman
james r chapman
Admin

Posts : 5526
Join date : 2012-01-31
Age : 73
Location : HELL, Michigan

Back to top Go down

Nygord’s Notes on Iris and clip on lenses  Empty Re: Nygord’s Notes on Iris and clip on lenses

Post by RodJ 12/4/2021, 6:06 pm

Jim amd shenaba, thanks but I’m not seeing how those frames do this:

“This system uses clip-on lenses that can be quickly and easily put over the basic lens (usually a prescription lens to get your vision to "normal" or zero) to add power when needed. Then there is an adjustable iris or diaphragm that goes between the eye and the lens to allow changes in depth of field.”


He explains that in bright light, put a +0.5 clip on over your regular glasses.  In low light, put +0.25.  Then, I guess, put the iris on in low light?


Plus lenses bring the focus in, minus lenses move the focus out. Generally, we recommend you start with two clip-on lenses: +.25 and +.50 diopter (diopter is one meter change in focal length). These take care of most situations. Here the rule is: "The stronger the light, the stronger the lens". So, in bright light you will need to add the +.50 instead of the +.25. Why? Depth of field.
Depth of field means over how long a distance things are things in focus. In bright light, your natural pupil closes down and you get the "pinhole camera" effect: everything for quite a ways out is in focus. This means the pistol shooter's no-no: the target will be in focus! We all know that you don't want that, so it takes an added power lens to "fuzz" it up again. Now what about low light? Well, when your natural pupil opens up everything gets "fuzzy" - most importantly, the front sight! And that is where the adjustable iris comes in: you close it until you get the sights sharp and leave the target "fuzzy".


:thinking: 

RodJ

Posts : 253
Join date : 2021-06-26

chopper likes this post

Back to top Go down

Nygord’s Notes on Iris and clip on lenses  Empty Re: Nygord’s Notes on Iris and clip on lenses

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum