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
