Graflex.org

zparras · Joined: 25 Nov 2004 Posts: 13 Location: Toronto Canada

I recently bought a Graflex Optar 380mm for my Speed Graphic. I was wondering where I could find the specs on the lens, regarding minimum focussing distance and the depth of field table. Great web site guys.

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Anthro photo guy

Henry · Posted: Sun Oct 23, 2005 5:03 pm Post subject:

According to Graphic Graflex Photography, 10th edition (1954), p. 32, "The longest focal length presently available in the Tele-Optar series is the 38cm (15-inch) Graflex Tele-Optar f/5.6. This has an effective magnification of nearly 3X on the 4x5 camera as compared with the 127mm lens, and 2X on the Super D Graflex 4x5." On p. 45, Table VI gives hyperfocal distances in feet for the 38cm lens as 223 (f/5.6), 156 (f/

, 114 (f/11), 78 (f/16), and 57 (f/22).

zparras · Joined: 25 Nov 2004 Posts: 13 Location: Toronto Canada

Thanks Henry, I actually missed that table in my copy of Graphic Graflex Photography, 10th edition (1954). Thanks for pointing this out to me.

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Anthro photo guy

Henry · Posted: Sun Oct 23, 2005 10:52 pm Post subject:

You're welcome! This exercise also gave me the opportunity to refresh my memory WRT hyperfocal distances, especially the fact that if one focuses precisely at the hyperfocal distance for a given f-stop, everything from infinity to *one-half* the hyperfocal distance will be in focus.