Frímann,
for a focusing schlieren system the 50mm lenses and even the 100 one will not
give you a significant field size plus the screen will need to be placed very
close to the image plane. Lesnes that start to be useful are thos that have a
focal length of maybe 300mm or more and an aperture of maybe f/4 or so. Your
zoom might work but I have not had experience with 35mm camera lenses used for
this application.
good luck,
andy
Andrew Davidhazy, Professor
Imaging and Photographic Technology
School of Photo Arts and Sciences/RIT
70 Lomb memorial Drive
Rochester, NY 14623
em: andpph@xxxxxxx
web: www.rit.edu/~andpph
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
Frímann Kjerúlf
