[simpits-tech] 3x Fresnel lens

[Rob Hommel]

The very idea that they are listing this thing as a 3X or 6X makes my head
hurt. Would one of you buy one of the damn things and figure it out. Fresnel
lenses have been a very common topic around here for a long time how many of
you have used them to date?

Magnification lenses are not quite the way you need to be thinking this
through. Pick up an Edmonds Scientific catalog and get a basic run down on
optics at least a refresher on the subject. Are you going to project the
image or hang the fresnel lens in front of a monitor? Two different
problems, two different solutions one of which has next to nothing to do
with magnification. I will be more than happy to assist you in trying to
understand fresnel lenses.

BTW The sales droid is lying through his hat about one of them being harder
to make than the other, The material maybe thicker but it really isn't any
harder for them to make. Do a search for Fresnel on the net and there is a
prim available on the subject someplace I have seen it. Do your homework on
this subject optics is one of the easiest of the physical sciences

Keep 'em Flying
Rob Hommel
----- Original Message -----
From: "Jim K." <JimK@sisna.com>
To: "Simpits" <simpits-tech@simpits.org>
Sent: Monday, October 21, 2002 8:38 PM
Subject: [simpits-tech] 3x Fresnel lens


> Guys,
> I emailed www.3dlens.com asking if they sold a 6X sheet lens and here was
> his reply:
>
> "We do not have 6x lens because it is very difficult to make high
> magnification on such large size in only 0.4mm thickness, unless the
> material is very thick as 2mm.
> In internet somebody said that he sells 6x lens, but I don't believe it.
> Most of TV projector resellers on eBay are our customers and use our 3X
> lens (#406 180mm x 260mm), but some sellers claim the lens a 6X lens, it
is
> not true.
> Best regards"
>
> Jim
>
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