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Lens for Series D

 
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xyzphoto



Joined: 03 Jan 2002
Posts: 47
Location: Oklahoma

PostPosted: Sun Feb 23, 2003 2:32 am    Post subject: Reply with quote

I did do the recommended reading before posting, but did not find the answer, so here's depending on some of you. I have a Graflex RB Series D 3 1/4 x 4 1/4 camera. The lens is marked "Xenar f:3.5 F=18 cm DRPa Jos. Schneider & Co. Kreuznach no. 290116". I have a basic understanding of what the f:3.5 and F=18 mean. In practical terms to me this lens gives me a field of view very close to my 35mm SLR with a 50mm lens. I would like a lens for this Graflex camera which would give me a field of view corresponding to a 100mm on the 35mm SLR. Is such available? If so, what specs would describe such a lens?
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Dan Fromm



Joined: 14 May 2001
Posts: 2119
Location: New Jersey

PostPosted: Sun Feb 23, 2003 2:51 am    Post subject: Reply with quote

Quote:

On 2003-02-22 18:32, xyzphoto wrote:
I did do the recommended reading before posting, but did not find the answer, so here's depending on some of you. I have a Graflex RB Series D 3 1/4 x 4 1/4 camera. The lens is marked "Xenar f:3.5 F=18 cm DRPa Jos. Schneider & Co. Kreuznach no. 290116". I have a basic understanding of what the f:3.5 and F=18 mean. In practical terms to me this lens gives me a field of view very close to my 35mm SLR with a 50mm lens. I would like a lens for this Graflex camera which would give me a field of view corresponding to a 100mm on the 35mm SLR. Is such available? If so, what specs would describe such a lens?
Well, 360/180 = 100/50, so you probably want a 360 +/-. There are a variety of barrel lenses of roughly that focal length around, I supposed you could adapt one. I have no idea if Graflex ever offered one for your 3 1/4 x 4 1/5.
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xyzphoto



Joined: 03 Jan 2002
Posts: 47
Location: Oklahoma

PostPosted: Sun Feb 23, 2003 7:40 pm    Post subject: Reply with quote

Thanks Dan. The 360mm helps get me started. Must such a lens be specific for a 3 1/4 x 4 1/4 or are the 2 x 3 and the 4 x 5 interchangable? What is the term used to describe the feature of this lens wherebe it must be stopped down manually?
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Dan Fromm



Joined: 14 May 2001
Posts: 2119
Location: New Jersey

PostPosted: Sun Feb 23, 2003 8:07 pm    Post subject: Reply with quote

Quote:

On 2003-02-23 11:40, xyzphoto wrote:
Thanks Dan. The 360mm helps get me started. Must such a lens be specific for a 3 1/4 x 4 1/4 or are the 2 x 3 and the 4 x 5 interchangable? What is the term used to describe the feature of this lens wherebe it must be stopped down manually?
A lens is a lens is a lens. The only questions are whether it has enough coverage and back focus. In the context of your Super D, "enough back focus" means, will it clear the mirror? I use lenses intended for 4x5, e.g., 160/5.6 Pro Raptar, 65/8 Acugon, on my 2x3 Graphics. I don't use my Nikon AIS mount lenses on the Graphics because they won't cover 2x3.

Manual diaphragm. You might -- I don't know -- have a lens or several for your camera with semi-auto diaphragms that need to be opened and cocked manually and that will stop down automatically when you push the shutter release. Most of the lenses you'll find that might do will have manual diaphragms; I don't know of any for LF that have preset diaphragms, but now that you have the idea you might be able to rig something that will act like one. With presets, there are two rings 'round the lens, one for the diaphragm itself, the other to stop the first. One sets the first to wide open, sets the second to the desired aperture, and then at the moment of taking the shot spins the first as far as it will go. The second ring stops the first at the right place. Clunky, but that's how 35 mm SLRs worked for a while.
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