I am in the middle of making a 5x7 Plate holder and I need someone to confirm that the T-distance for a 5x7 is 0.228. I have seen a few other measurements but this seems to be the US standard. Thoughts?
http://incameraindustries.com/
I am in the middle of making a 5x7 Plate holder and I need someone to confirm that the T-distance for a 5x7 is 0.228. I have seen a few other measurements but this seems to be the US standard. Thoughts?
http://incameraindustries.com/
This website claims it to be .228 as well
http://home.earthlink.net/~eahoo/page8/filmhold.html
Dan
The T-distance is indeed .228" +/- .010" according to the 1951 ASA standard. Keep in mind this is the distance to the back of the film slot, not to the emulsion. The slot is .012". This leaves a sloppy tolerance for the actual position of the film. A film or plate holder loaded from the back instead of from the front can minimize this slop.
so if the holder loads form the back should the t distance be .216?
Yes, or a wee bit more. While the slot is .012", film varies from maybe .004" to .010" with (I believe) .007" being common.
thanks Jim!
Stupid follow up question then the focus screen should be set such that the imaging surface is at the same point correct? If there is a fresnel in front of the screen, one would still want to set the matte surface of the screen to that dimension.
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