[SGVHAK] 3-D print a magnifying glass?

[nopbin at gmail.com]

Assuming you want to use your printer perhaps glass or plastic casting is
an option.




On Tue, Nov 19, 2013 at 8:09 PM, Claude Felizardo <cafelizardo at gmail.com>wrote:

> Did i say concave?  Typo on my part.  i meant bulging so yes convex.  Wow,
> I was rereading and I had typed concave again or perhaps it's the
> auto-correct?
>
> Joining lenses - tricky as you'll get refraction every time you change
> material from lens to cement to lens again.  Unless it's well done, it
> might affect the image.
>
> Protesting business practices or just be done with it.  You could spend
> hours searching for a comparable product.
>
> 5x?  I think i had a slide magnifier that looked similar, don't recall
> what magnification.  Probably not as large as 2.5".  Not sure as I haven't
> used in since a big slide scanning project several years back.  Don't
> recall if I had gotten it at a computer swap meet or at a photography
> store.
>
> Hey, what about B&H?  They have several to chose from:
> http://www.bhphotovideo.com/c/buy/Loupes-Magnifiers/ci/987/N/4077634476
>
> I just did a google search on "slide magnifier"
>
> Claude
>
>
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>
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>
> On Tue, Nov 19, 2013 at 7:27 PM, John Kreznar <jek at ininx.com> wrote:
>
>> In a posting purporting to be from Claude Felizardo
>> <cafelizardo at gmail.com> but lacking a digital signature, it is written:
>>
>> > What is your application for wanting to print a magnifying lens?
>>
>> It's to replace a lost pocket magnifier that was my constant companion
>> for over 30 years and that I used for everything from reading fine print
>> to inspecting small objects.  It was unframed glass, all chipped around
>> the edges with scratches and even a blob of superglue one the surface,
>> but still eminently useful.
>>
>> My first stop was http://www.scientificsonline.com (Edmund) where I
>> found http://www.scientificsonline.com/giant-5x-stand-magnifier.html,
>> 2.5" diameter, 5X, $10.95.  Good price, and I could remove the stand and
>> provably be back where I started.
>>
>> But in spite of fond memories of Edmund, I don't like their current
>> business practices.  Further, I'm beginning to try to move to Bitcoin
>> for trade whenever possible, and a low-priority project like this is a
>> good starting point.  Anybody have one they want to sell for Bitcoin?
>>
>> Of course, there's nothing "Bitcoin" about a 3-D printer, but I thought
>> I'd also use this occasion to tap SGVHAK's collective wisdom about
>> current 3-D printer capabilities.  Looks like they're not yet good
>> enough.
>>
>> > I think a magnifying lens has to be concave ...
>>
>> convex, for sure
>>
>> > ... if it's flat on once side then you've cut the power in half no?
>>
>> Hence my idea of cementing two together.
>>
>> > A fresnel lens cuts down on the volume of material needed and space
>> > but I don't think you really want to try reading through one for any
>> > length of time.
>>
>> Agreed.
>>
>> > The resolution of 3d printers are in the order of fractional mm but I
>> > think you might need something finer?
>>
>> No doubt.
>>
>> > I would think there would be so much optical distortion I can't see it
>> > being useful for reading.
>>
>> Yep.
>>
>> > Okay, looking around...
>>
>> Thanks for the links.  Following them now.
>>
>> --
>> OpenPGP key: http://ininx.com
>>  John E. Kreznar jek at ininx.com 9F1148454619A5F08550 705961A47CC541AFEF13
>>
>>
>
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