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Focal Length?

  • JulianP Tuesday, November 29, 2011 3:13 PM Reply
    It would be nice to know. Anyhow, I just bought the item. At $4.20, it's as cheap as a (large) packet of chips, and healthier.
    What we do in life, echoes in eternity. Gadgets unfortunately don't last
    as long.

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  • ThierryP03 Monday, January 30, 2012 1:30 PM Reply
    So now you have received them, what is their approx. focal length in mm?
    Thanks
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  • JulianP Monday, January 30, 2012 4:36 PM Reply
    I measured it at 15mm. It focuses my AA flashlights well, but I can barely screw the head back on because the lens is very thick.
    What we do in life, echoes in eternity. Gadgets unfortunately don't last
    as long.

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  • ThierryP03 Monday, January 30, 2012 5:40 PM Reply
    Thanks, indeed very thick lens, I'm going for a smaller one: SKU 4588.
    We'll, not 'one', you need to buy 20 of 'em.
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  • DrJones Friday, April 8, 2016 7:10 PM Reply

    However, these have a much better optical quality than sku.4588, which have quite a big spherical aberration.

    15mm is back focal length; effecive focal length is bigger; more like around 20mm (because the lens is so thick).   

    Replying after 4 years ... for whoever reads this :)

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