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Old November 21st, 2004, 05:01 PM   #1
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distance between gg and lens?

hi gang..

i am 1 week close to testing my "very slow progressing homemade mini35 design (due to my exams at school)"...

i am using a 1.4 pentax slr lens..i must keep a CONSTANT distance between th ground glass and slr lens...which is 45 milimeters in other words 1,7578 inches...i am wondering does this distance change in different brands of lenses??..or lets say i want to use a 35mm lens...?

any one have any idea about this..?and is the length i am talking about called focal length ?

cheers
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Old November 21st, 2004, 08:32 PM   #2
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You are looking at the "flange distance". A table for various stills cameras is here:
http://www.graphics.cornell.edu/~wes...-register.html.
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Old November 22nd, 2004, 11:19 AM   #3
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yeah valeriu thats what i was looking for...do u have any idea from which point to point do we calculate...is it from the bayonet to the lens where it touches the bayonet?
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Old November 22nd, 2004, 03:54 PM   #4
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AFAIK it is measured from the body to the film plane or from where the lens and body make contact.
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Old November 22nd, 2004, 04:42 PM   #5
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just what i wanted thanx pal...
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Old November 23rd, 2004, 03:49 PM   #6
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focal plane

this is what I use in the static adapter to get a perfect focus to the ground glass.http://www.thorlabs.com/ProductDetai...roduct_ID=1486
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Old November 23rd, 2004, 08:44 PM   #7
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screwed (adjustable) flange distance was what i had in my first design..but when i speeded up the gg i saw vibration and it caused the ground glass to move milimeter by milimeter very slowly...i am now making another design with fixed flange distance...
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