Graflex.org

primus96 · Posted: Wed Jan 19, 2005 8:59 pm Post subject:

I posted the same subject in Lens help, perhaps it was the wrong forum.
I wondered what sort of coverage is needed to cover every possible movement a Pacemaker Graphic is capable of.

Dan Fromm · Joined: 14 May 2001 Posts: 2148 Location: New Jersey

RichS · Posted: Thu Jan 20, 2005 5:09 am Post subject:

I was going to enter a reply with all the answer here (or try at least), so I started looking for the movement measurments of the Speeds... No luck in GGP or Paine or even graflex.org!

Does anyone know where the movements _are_ listed? Now I want to know...

Anyway, since you apparently have the camera, it's not too hard to figure out. Just move the lens as far as it will go in an direction and measure that amount of movement from the center position. Add twice that amount of movement to the roughly 155mm of coverage that the film needs, and the total is the amount of coverage the lens must have to illuminate the film area. So if the lens moves 25mm, the total would be 205mm image circle.

Although it does get more complex with tilts and you'd have to fugure out the angles... And then there's the additions of shifts, rise/fall and tilt... Hmmm, good luck...

Maybe someone just plains know

[ This Message was edited by: RichS on 2005-01-19 21:10 ]

primus96 · Posted: Thu Jan 20, 2005 8:05 am Post subject:

Never was much good at maths to work out angles, which is whyI wanted to pick your brains.
I ought to have said I meant 4x5.