<div dir="ltr">Assuming you want to use your printer perhaps glass or plastic casting is an option.<br><br><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Nov 19, 2013 at 8:09 PM, Claude Felizardo <span dir="ltr"><<a href="mailto:cafelizardo@gmail.com" target="_blank">cafelizardo@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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?<div>
<br></div><div>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.<br>
<div><br></div><div>Protesting business practices or just be done with it. You could spend hours searching for a comparable product.</div><div><br></div><div>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. </div>
<div><br></div><div>Hey, what about B&H? They have several to chose from:</div><div><a href="http://www.bhphotovideo.com/c/buy/Loupes-Magnifiers/ci/987/N/4077634476" target="_blank">http://www.bhphotovideo.com/c/buy/Loupes-Magnifiers/ci/987/N/4077634476</a><br>
</div><div><br></div><div>I just did a google search on "slide magnifier"</div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Claude</div><div><br></div><div><br></div><div><br></div><div><br></div>
<div><br></div></font></span></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra">
<br><br><div class="gmail_quote">On Tue, Nov 19, 2013 at 7:27 PM, John Kreznar <span dir="ltr"><<a href="mailto:jek@ininx.com" target="_blank">jek@ininx.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
In a posting purporting to be from Claude Felizardo<br>
<<a href="mailto:cafelizardo@gmail.com" target="_blank">cafelizardo@gmail.com</a>> but lacking a digital signature, it is written:<br>
<div><br>
> What is your application for wanting to print a magnifying lens?<br>
<br>
</div>It's to replace a lost pocket magnifier that was my constant companion<br>
for over 30 years and that I used for everything from reading fine print<br>
to inspecting small objects. It was unframed glass, all chipped around<br>
the edges with scratches and even a blob of superglue one the surface,<br>
but still eminently useful.<br>
<br>
My first stop was <a href="http://www.scientificsonline.com" target="_blank">http://www.scientificsonline.com</a> (Edmund) where I<br>
found <a href="http://www.scientificsonline.com/giant-5x-stand-magnifier.html" target="_blank">http://www.scientificsonline.com/giant-5x-stand-magnifier.html</a>,<br>
2.5" diameter, 5X, $10.95. Good price, and I could remove the stand and<br>
provably be back where I started.<br>
<br>
But in spite of fond memories of Edmund, I don't like their current<br>
business practices. Further, I'm beginning to try to move to Bitcoin<br>
for trade whenever possible, and a low-priority project like this is a<br>
good starting point. Anybody have one they want to sell for Bitcoin?<br>
<br>
Of course, there's nothing "Bitcoin" about a 3-D printer, but I thought<br>
I'd also use this occasion to tap SGVHAK's collective wisdom about<br>
current 3-D printer capabilities. Looks like they're not yet good<br>
enough.<br>
<br>
> I think a magnifying lens has to be concave ...<br>
<br>
convex, for sure<br>
<br>
> ... if it's flat on once side then you've cut the power in half no?<br>
<br>
Hence my idea of cementing two together.<br>
<div><br>
> A fresnel lens cuts down on the volume of material needed and space<br>
> but I don't think you really want to try reading through one for any<br>
> length of time.<br>
<br>
</div>Agreed.<br>
<div><br>
> The resolution of 3d printers are in the order of fractional mm but I<br>
> think you might need something finer?<br>
<br>
</div>No doubt.<br>
<div><br>
> I would think there would be so much optical distortion I can't see it<br>
> being useful for reading.<br>
<br>
</div>Yep.<br>
<br>
> Okay, looking around...<br>
<br>
Thanks for the links. Following them now.<br>
<div><div><br>
--<br>
OpenPGP key: <a href="http://ininx.com" target="_blank">http://ininx.com</a><br>
John E. Kreznar <a href="mailto:jek@ininx.com" target="_blank">jek@ininx.com</a> 9F1148454619A5F08550 705961A47CC541AFEF13<br>
<br>
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