Helping finding a converging lens with focal length of several feet

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Dave - 26 Apr 2007 16:30 GMT

I am building a large camera obscura.

Can anyone recommend where or how to obtain a converging lens with a
focal length of several feet (for less than $200)?

I am open to unique suggestion,s even if they result in some
distortion of aberration.

Thanks
Dave

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dadiOH - 26 Apr 2007 20:13 GMT

> I am building a large camera obscura.
>
> Can anyone recommend where or how to obtain a converging lens with a
> focal length of several feet (for less than $200)?

I'd browse at Edmund Scientific...
http://www.edsci.com/

Especially this division...
http://www.anchoroptics.com/search/advanced.cfm

> I am open to unique suggestion,s even if they result in some
> distortion of aberration.

At your price you can count on it.

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Pat - 27 Apr 2007 14:38 GMT

> I am building a large camera obscura.
>
[quoted text clipped - 6 lines]
> Thanks
> Dave

what about stealing the lens out of an old opaque projector. I am not
recommending this specific one but am using it only as an example.
http://cgi.ebay.com/DA-LITE-BESELER-VU-LYTE-III-3-OPAQUE-PROJECTOR-12300_W0QQite
mZ110119320378QQihZ001QQcategoryZ15257QQrdZ1QQcmdZViewItem

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Menno - 27 Apr 2007 20:57 GMT

Old glasses. I think +1 diopter equals 1m focal length.

> I am building a large camera obscura.
>
[quoted text clipped - 6 lines]
> Thanks
> Dave

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