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weemster
Joined: 21 Apr 2004
Posts: 12
Location: Colorado
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 Posted: Thu Jan 13, 2005 6:45 am Post subject: |
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Is it possible, without much work, to utilize a Pentax 645 lens with my graflex? A friend has given a couple of these to me and before I put them on Ebay I thought I would see if they were compatible with my crown.
Thanks,
Mike |
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RichS
Joined: 18 Oct 2001
Posts: 1468
Location: South of Rochester, NY
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| Posted: Thu Jan 13, 2005 6:54 am Post subject: |
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On 2005-01-12 22:45, weemster wrote:
Is it possible, without much work, to utilize a Pentax 645 lens with my graflex? A friend has given a couple of these to me and before I put them on Ebay I thought I would see if they were compatible with my crown.
Thanks,
Mike
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Yes, it's possible. "not much work" would be up to how creative you are!
But your Crown is probably a 4x5, correct? Those lenses will only cover 2x(2 or 3), not 4x5. Fine if you're using a roll film back or don't mind a circular image 
The next problem would be that they're probably in the short range, 50mm to 100mm or so. How well they work would depend on how short they are. You'd have a bit of trouble trying to use a 50mm...
The big problem is probably in the mounting. Crowns don't do well with temporary cardboard lensboards and these lenses may not be worth buying and drilling real ones to fit?
But if someone gave me some lenses, I would sure 'play' with them before I got rid of them... Have some fun!
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worldphoto
Joined: 05 Feb 2003
Posts: 199
Location: Southern California
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| Posted: Thu Jan 13, 2005 8:26 am Post subject: |
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| I know this doesn't answer your question but,at least, I can tell you how I use my 645 lenses. I bought a Medium format lens adapter for my 35mm Nikon. It is made in Germany by Zork. They are my best lenses for my Nikon! Harry |
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Dan Fromm
Joined: 14 May 2001
Posts: 2144
Location: New Jersey
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| Posted: Thu Jan 13, 2005 11:57 am Post subject: |
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| Quote: |
On 2005-01-12 22:45, weemster wrote:
Is it possible, without much work, to utilize a Pentax 645 lens with my graflex? A friend has given a couple of these to me and before I put them on Ebay I thought I would see if they were compatible with my crown.
Thanks,
Mike
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Um, doesn't the 645 have a focal plane shutter? If so, lenses for it are not in shutter. Your Crown has no shutter. Get the picture?
Coverage is also a problem; lenses for the 645 won't come close to covering 4x5. |
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Tiltall ED
Joined: 24 Feb 2005
Posts: 6
Location: Olympic Peninsula Wa. gateway to heaven
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| Posted: Wed Mar 02, 2005 4:31 pm Post subject: |
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This is something I've wondered about for quite awhile, but I have the Pentax 6x7, with the lenses, I have for it. Since on the body, it's a set distance from the bayonet ring to the film plane. The long lens if use as manual barrel lenses, and could be fitted to a bayonet ring mounted on a lens board, for the Speed Graphic, might work. If the lens board bayonet ring was designed to accept lens on both sides, a 67 converter on the inside would double the focal length and f-stop, and if 67 lens extension tubes, or helicoid were used on the front would enlarge the image, and produce a larger image circle, Yes! or No? These lenses stop down to f/22 (55mm f/3.5, 105 f/2.4) & f/32 on three of my lenses. (135 f/4, 165 f/4, 200 f/4)
And there are two lenses Pentax made that have leaf shutters in them, ( 90mm. f/ 2.8 and 165mm. f/ 4 ) and the Soft 120mm. f/ 3.5 is click stop diaphragm, which would work the best as a view lens. And with Pentax''s inner and outer bayonet ring the 600mm f/4-f/45 (or 300mm. in a 35mm lens)
Now if a cable linkage to the Graflex shutter and bayonet ring all lenses would work in Auto, now all I need is some parts, and get my butt out in my machine shop. And a Pentax engineer's or users input. What did Fred Picker always say? Try it!!
These are some great lenses, not to be cross- usable !
Where's my pipe? I need to dream some more!
_________________
Only you and a camera, can capture an image, a moment of time, in a fraction of time! Why wait?
"Oh babe!, you're a hefty one!, spread your legs, raise up a little, turn to the left, and now right! You're the most beautiful.... tripod I use! |
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Dan Fromm
Joined: 14 May 2001
Posts: 2144
Location: New Jersey
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| Posted: Wed Mar 02, 2005 5:46 pm Post subject: |
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| Quote: |
On 2005-03-02 08:31, Tiltall ED wrote:
This is something I've wondered about for quite awhile, but I have the Pentax 6x7, with the lenses, I have for it. Since on the body, it's a set distance from the bayonet ring to the film plane. The long lens if use as manual barrel lenses, and could be fitted to a bayonet ring mounted on a lens board, for the Speed Graphic, might work. If the lens board bayonet ring was designed to accept lens on both sides, a 67 converter on the inside would double the focal length and f-stop, and if 67 lens extension tubes, or helicoid were used on the front would enlarge the image, and produce a larger image circle, Yes! or No? These lenses stop down to f/22 (55mm f/3.5, 105 f/2.4) & f/32 on three of my lenses. (135 f/4, 165 f/4, 200 f/4)
And there are two lenses Pentax made that have leaf shutters in them, ( 90mm. f/ 2.8 and 165mm. f/ 4 ) and the Soft 120mm. f/ 3.5 is click stop diaphragm, which would work the best as a view lens. And with Pentax''s inner and outer bayonet ring the 600mm f/4-f/45 (or 300mm. in a 35mm lens)
Now if a cable linkage to the Graflex shutter and bayonet ring all lenses would work in Auto, now all I need is some parts, and get my butt out in my machine shop. And a Pentax engineer's or users input. What did Fred Picker always say? Try it!!
These are some great lenses, not to be cross- usable !
Where's my pipe? I need to dream some more!
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Not to be overly negative or dampen your enthusiasm, but the shortest lens that will for sure focus to infinity on a 4x5 Graflex is the 190 Ektar. |
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