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Large, quality, AR Lenses?

Exerd

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Jan 2, 2010
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Hi fellow LPF members,

I have been faced with a small challenge lately. That is, finding a large positive FL lens, of aspherical type, that is 88mm total OD (about 80mm minus its mounting flange), and back plane surface focal point of anywhere between 53-62mm. 60mm back focal point would be about perfect (FL from lens plano surface, not lens center).

I would like to use a quality lens, so I was looking past price, for something maybe CNC ground, glass (or other hard substance, with a high light transmission in the 4500K range for daylight-white LEDs).

I seem to be stumbling across cast glass/plastic once I find a lens that big. I have a 75mm cast glass lens, and it has a lot of spherical abberation. Almost as if, where it is brightest in focus, is not where it is actually focused best for clarity of the chip image.

Does anyone know of a company who may custom produce one to spec, or have quality lenses already of this size?

Thanks a lot. I'll keep digging myself. I've made a few orders now from Edmund, but their 80mm aspheric has been sold out it appears for a while now.
 



swamidog

Active member
Joined
Aug 21, 2009
Messages
388
Points
43
have you tried surplus shed? they have a pretty gigantor inventory of cheap good quality lenses:

Lens Finder - Surplus Shed


Hi fellow LPF members,

I have been faced with a small challenge lately. That is, finding a large positive FL lens, of aspherical type, that is 88mm total OD (about 80mm minus its mounting flange), and back plane surface focal point of anywhere between 53-62mm. 60mm back focal point would be about perfect (FL from lens plano surface, not lens center).

I would like to use a quality lens, so I was looking past price, for something maybe CNC ground, glass (or other hard substance, with a high light transmission in the 4500K range for daylight-white LEDs).

I seem to be stumbling across cast glass/plastic once I find a lens that big. I have a 75mm cast glass lens, and it has a lot of spherical abberation. Almost as if, where it is brightest in focus, is not where it is actually focused best for clarity of the chip image.

Does anyone know of a company who may custom produce one to spec, or have quality lenses already of this size?

Thanks a lot. I'll keep digging myself. I've made a few orders now from Edmund, but their 80mm aspheric has been sold out it appears for a while now.
 

steve001

Well-known member
Joined
Jun 3, 2007
Messages
2,521
Points
113
Hi fellow LPF members,

I have been faced with a small challenge lately. That is, finding a large positive FL lens, of aspherical type, that is 88mm total OD (about 80mm minus its mounting flange), and back plane surface focal point of anywhere between 53-62mm. 60mm back focal point would be about perfect (FL from lens plano surface, not lens center).

I would like to use a quality lens, so I was looking past price, for something maybe CNC ground, glass (or other hard substance, with a high light transmission in the 4500K range for daylight-white LEDs).

I seem to be stumbling across cast glass/plastic once I find a lens that big. I have a 75mm cast glass lens, and it has a lot of spherical abberation. Almost as if, where it is brightest in focus, is not where it is actually focused best for clarity of the chip image.

Does anyone know of a company who may custom produce one to spec, or have quality lenses already of this size?

Thanks a lot. I'll keep digging myself. I've made a few orders now from Edmund, but their 80mm aspheric has been sold out it appears for a while now.
Ask Edmund to make a custom optic. Look at their other division, Anchor Optics.
 
Last edited:

Exerd

Active member
Joined
Jan 2, 2010
Messages
448
Points
28
I found some nice items at the Surplus Shed, but they said that they couldn't coat them in house, but could grind them. I don't know about that, if they can't actually coat them it just adds another step.

It's funny on one of "Edmunds" envelops containing a lens I saw Anchoroptics.com, and you're right, the nice coated few lenses I did receive had the same packaging on them. I'll have to try them. Thanks
 




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