Firmann,
I presume you've already run a check using Google for "schlieren
optics." the first reference of 44,000 is http://www.fas.harvard.edu/
~scdiroff/lds/LightOptics/SchleirenOptics/SchleirenOptics.html.
Others offer to sell you the components, or even a complete system.
Roger
Roger Eichhorn
eichhorn@xxxxxx
On 22 Feb 2006, at 20:57, wpettit@xxxxxxxxxxxxx wrote:
Frimann,
We are referring to OLD copier lenses that were used in the late
1960's and early 1970's. They were fairly common a few years ago.
You might send an email to the Surplus Shed and tell them what you
are looking for--they might have one that they don't have listed.
Regarding the lenses you suggest using, I would defer to Andy on
that, and on optics resources as well.
Good luck,
Bill
-----Original Message-----
From: Fr�mann Kjer�lf <kjerulf@xxxxxxxxx>
Sent: Feb 22, 2006 7:24 PM
To: List for Photo/Imaging Educators - Professionals - Students
<photoforum@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: Question regarding an homebuilt focusing schlieren
system
Bill, Andy
When you talk about surplus copy lenses, are you talking about
lenses from
photocopy machines? I've just opened up an old photocopier
machine I had in
my garage, and there is no usable lens in there.
Surplusshed.com looks like a good source, but now it comes down to
my lack
of knowledge in lens engineering. From the little I know then my
guess is
that two lenses like the *L4146* from the surplusshed website,
stacked
together, might do the trick. That lens is:
TYPE: Double Convex
DIAMETER: 35.5 mm
FOCAL LENGHT: 444 mm
COATED: no
Also, I'm getting pretty curious on lens science. Any good hints
on website
or books that might be helpful?
regards
Fr�mann
On 2/20/06, wpettit@xxxxxxxxxxxxx <wpettit@xxxxxxxxxxxxx> wrote:
Frimann,
If you can't obtain surplus copy lenses at your location, check out
http://www.surplusshed.com I've bought a lot of surplus optics
from them
and they are a relible supplier. I'm sure they can ship
internationally.
Bill
-----Original Message-----
From: Fr?mann Kjer?lf <kjerulf@xxxxxxxxx>
Sent: Feb 20, 2006 4:24 PM
To: List for Photo/Imaging Educators - Professionals - Students
< >> photoforum@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Question regarding an homebuilt focusing schlieren system
Hi there
I'm currently planning to set up a focusing schlieren system as a
project at my school.
I'm using the technique andrew davidhazy describes on his website:
http://www.rit.edu/~andpph/text-schlieren-focus.html
My question is: Will this setup work with my Canon EOS / FD
lenses ?
What I have is :
50mm f/1.4 FD by Canon
50mm f/1.8 EOS by Canon
100mm f/3.5 by Vivitar
100-300mm f/4.5-5.6 by Canon
Andrew says on his site: "It is desirable to use a large aperture,
relatively long focal length lens for the imaging lens. Some
surplus
copier lenses can be applied for this purpose. "
So I guess my 50mm lenses will not do the trick?
Thanks in advance for any answers
Fr?mann Kjer?lf
--
Best Regards
Fr�mann Kjer�lf
