Fresnel rear sight

C

Centerfire

Member
I was at the range yesterday speaking with an AR15 competitor that needs that rear iron sight with the fresnel lens to allow the front sight and target to be in focus together. Sinclair used to have in catalog but the say they don't carry any more.
Anyone know who is selling them now?
Thanks,
Centerfire
 
You sure about the name ?
It was a focusing feature on 35mm slr cameras.
 
He's asking about a MicroSight which is a Fresnel like design. Brownells and Sinclair still show them online, on sale and available. Creedmoor used to have them but I see they aren't listed anymore. You might search for "MicroSight and see what you can find.

http://www.brownells.com/rifle-parts/sights/sight-accessories/aos-microsight-prod44975.aspx

http://www.sinclairintl.com/optics/sights/sight-accessories/aos-microsight-prod44975.aspx

http://www.accurateshooter.com/optics/microsight-technology-for-iron-sights/
 
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Thank you

Thanks for locating this for me. I tried Brownells twice and they did not know what I was talking about.
They have taken it out of their Sinclair Catalog.
Centerfire
 
maybe, but PETRI had a invented/patent on 35mm lens focusing system with the same name.

FBecigneul said:
Actually fresnel, pronounced fray-nel, is a flat lens with concentric cuts around the center and outward. This was done to focus the light into the center. Light house lenses were all fresnel lenses.
Click to expand...
 
FBecigneul said:
Actually fresnel, pronounced fray-nel, is a flat lens with concentric cuts around the center and outward. This was done to focus the light into the center. Light house lenses were all fresnel lenses.
Click to expand...

Was developed to reduce lens mass.
It allows the use of multiple piece lenses that would be very heavy and thick if made as a single piece.
The penalty is usually additional aberration.

For mm-wave (very very high frequency microwaves) we used to make them out of black nylon and Teflon.
Used to freak out the machine shop.

The machinists looked at us like we came from Mars.
 
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