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Thread: Reduction (de)magnifer

  1. #1
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    Reduction (de)magnifer

    I have a customer that has a hand held lens that he calls a reduction lens, it is 3" in diameter with a handle like a magnifier. I measure the power and find -4.00D, biconcave lenses -2.00D each side. He is an artist that uses it to stand in front of a painting at about 3 feet and it allows him to see the entire painting 6'-8' wide. He needs to get a replacement and I have not had any luck finding one. Does anyone know where I could find one?
    Thanks

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    Quote Originally Posted by CME4SPECS View Post
    I have a customer that has a hand held lens that he calls a reduction lens, it is 3" in diameter with a handle like a magnifier. I measure the power and find -4.00D, biconcave lenses -2.00D each side. He is an artist that uses it to stand in front of a painting at about 3 feet and it allows him to see the entire painting 6'-8' wide. He needs to get a replacement and I have not had any luck finding one. Does anyone know where I could find one?
    Thanks
    Does it have to be double concave? What material? If so I would think any lab could make one. I think I could but it would have to be plastic.

  3. #3
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    I assume it is glass. He wants what he has now.

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    Quote Originally Posted by CME4SPECS View Post
    I assume it is glass. He wants what he has now.
    If all else fails tell him to stand further away!

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    Master OptiBoarder rbaker's Avatar
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    Duck soup if you have a hand pan, an 80MM rough lens blank, two laps and the appropriate abrasives. I doubt that you will be able to source this lens through an ophthalmic lab but a precision optics shop should be able to crank it our real easy.

  6. #6
    My Brain Hurts jpways's Avatar
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    I don't have the equations in front of me to know what % of minification is required but here's a 0.5x and a 0.25x https://ocutech.com/all-products/aid...tunnel-vision/

  7. #7
    OptiBoardaholic OptiBoard Gold Supporter Mick's Avatar
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    B&L had one eons ago. Maybe someone has one in olllld stock.

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    Master OptiBoarder CCGREEN's Avatar
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    Without a doubt any lab worth its salt should be able to make one for you. Providing the handle can be taken apart and a new lens inserted.

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    Thanks for all of your help. He thinks he bought in through mail order years ago.

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    Master OptiBoarder rbaker's Avatar
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    Quote Originally Posted by CCGREEN View Post
    Without a doubt any lab worth its salt should be able to make one for you. Providing the handle can be taken apart and a new lens inserted.
    Therein lies the problem; finding an ophthalmic lab worth its salt.

  11. #11
    What's up? drk's Avatar
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    Big time.

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