[LargeFormat] a gritty day

[Vincent Dobson]

It is strange this thread started just as I am now in the process of
building a facility for CXXXXX Vision they are renting space from xyz co.
xyz co did the inventing and R&D to develop machinery that injects optical
plastic in molds to manufacture eyeglass lens. CV manufacturers and markets
the machines to the labs.
Interesting process, but, expensive to develop, however once developed, the
per unit cost is drastically reduced as compared to the labor intensive
method of taking a hockey puck size disk of plastic (or glass) and grinding
down to a particular prescription.

small world.



Vince Dobson
Visions In Nature
www.VisionsInNature.com



-----Original Message-----
From: largeformat-admin@f32.net [mailto:largeformat-admin@f32.net]On
Behalf Of Les Newcomer
Sent: Tuesday, January 21, 2003 4:50 PM
To: largeformat@f32.net
Subject: Re: [LargeFormat] a gritty day


And that would be just to make the mould to inject the optical plastic!

I think this thread started with ground glass for Speed Graphics and if
you want to use one for a  Speed you have to be a little careful where you
put it.

Most Anniversaries and Some Pacemaker Speeds did use fresnel or "Ektalite
Field lenses" as Graflex called them.  The ground glass on a Speed is
loaded from the back, and if you installed a fresnel where there wasn't
one, you'll shift the ground glass out of position the thickness of the
fresnel.

On Tuesday, January 21, 2003, at 01:28 PM, Vincent Dobson wrote:

> hmm, The material the man is made of is from various keys on~~~~~~~~~
> oops,
> I guess you mean the fresnels?  The ones I have are made from a very hard
> plastic, but this would not be a do it yourself project.  It takes a very
> precision and expensive machine - think optical grade lathe and cost mid
> 5
> to 6 figures I think.
>
>
>
> Vince Dobson
> Visions In Nature
> www.VisionsInNature.com
>
>
>
> -----Original Message-----
> From: largeformat-admin@f32.net [mailto:largeformat-admin@f32.net]On
> Behalf Of philip.lambert
> Sent: Tuesday, January 21, 2003 4:18 PM
> To: largeformat@f32.net
> Subject: Re: [LargeFormat] a gritty day
>
>
>
> ---
> From: "Vincent Dobson" <manitec@bellsouth.net>
> To: <largeformat@f32.net>
> Sent: Tuesday, January 21, 2003 7:52 PM
> Subject: RE: [LargeFormat] a gritty day
>
>
>> Very precise circular strokes. :)~~/~~~~!<
>
>
> Pardon me  -Is that a diagram or an oriental language?  And from what
> material
> do you make them?  PL
>
>
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