20x Hand Lens recommendations?

Harmon Seaver hseaver at cybershamanix.com
Mon Oct 28 04:53:16 EST 2002

  Please post the answers you get it they weren't sent to all -- I 
recently lost the lens I've been carrying for about 35 years, and 
haven't found anything to replace it (except my wife's, which she 
objects to, of course), so I'd like to find a good one. The site you 
listed has a great many, far more than I ever knew exiested. They're 
shipping charge, however, of over $8 for such a tiny thing is absurd.

Peter Werner wrote:
> I want to get a high-quality 20x hand lens to use when my 10x hand lens
> isn't powerful enough and am looking for recommendations. I will be
> using it mainly to look at fine structures on mushrooms and insects.
> Apparently, the best-quality optics are to be found in the Bausch and
> Lomb Hastings Triplet - however, the 20x magnifier in this series has a
> tiny lens, on the order of 7-8 mm, and hence has a tiny focal distance,
> which makes it very difficult to use. 
> I've been looking for alternatives. There are plenty of lower cost 20x
> triplets with 18-21 mm lenses, but I'm not sure about the quality of
> these. One company, GemOro, even makes a 20x magnifier in this size
> which it refers to as a Hastings Triplet, but I unfortunately cannot
> find a retailer who actually sells these.
> http://www.contenti.com/products/magnifiers/hand_magnifiers.html
> advertises a 20x qaudruplet magnifier from a Japanese company called
> JSP - it has a 14mm lens and apparently has aplanatic and achromatic
> correction. Has anybody ever tried these?
> Finally, I've read some brief mentions on one of these lists of a
> high-end 20x lens sold under the name Iwamoto. Its supposed to be very
> good quality and larger than the B&L 20x triplet. Unfortunately, a
> Google search turns up absolutely nothing about this or any other
> optical product under the brand name "Iwamoto". Can anybody give me
> more details about this?
> If anybody has any recommendations for a good-quality
> achromatic/aplanatic 20x hand lens with a decent focal length, please
> let me know.
> Thanks in advance,
> Peter

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