Look at this!

greenspun.com : LUSENET : Pentax 67 SLR : One Thread

http://digilander.iol.it/clabo/flexpen/ Even more beautiful then my 6x7 with home made tilt/shift contraption of a enlarger bellows and Vivitar VHE 135mm enlarger lens. But then, this bellows cost $400 secondhand in my country.. Nice work!

-- Peter Gooijer (rockrose@freeler.nl), February 06, 2001

Answers

Roberto, a 105mm lens would be the shortest focal length that would work with the bellows unless you found a shorter focal length that that was a reversed telephoto design(wide angle). Most lenses that people have in mind for such a project would be symmetrical or semi-symmetrical and either from a view camera or enlarger. These lenses lend themselves to off axis work(tilt/shift/swing etc).

-- Steve Rasmussen (srasmuss@flash.net), February 07, 2001.

I have contacted Claudio today, he told me he used a S2A Bronica bellows and the help from a craftman to build its tilt&shift converter. Unfortunately he claims the minimum focal lenght you can mount on a device like that is a 125 mm lense. This infact rules out architecture and landscape work. I have also contacted Zoerk, they have told me their MFS for P67 can be modified to accept a modified 105 mm enlarger lense. Not bad, what is really bad is the price, enough to buy a used 4x5" folding basic system. I also wonder if 105mm is really the minimum focal lenght obtainable with tilt&shift converters for P67..

-- (ik4jqw@amsat.org), February 07, 2001.

I forgot to put my name ...

-- Roberto Manderioli (ik4jqw@amsat.org), February 07, 2001.

Cool! Someone beat me on this one. I've got all the materials, just haven't had time to buy a spare P67 lens mount and machine it on there.

A source of wide angle lenses that would clear the Pentax 67 mirror box would be those from Mamiya RB67 or Fuji 680III. The Mamiya lense's wouldn't offer that much coverage so may not be that great for shift work, but Fuji's lenses are designed to cover the 6x8 format, and would easily cover the 6x7 negative, even with movements. Only problem might be vignetting due to the mirror box with extreme movements.

Otherwise the above posts are correct you are limited to about 100mm or greater in focal length for shift/tilt work.

Peace, Rolland

-- greenants (relliott@nasheng.com), February 09, 2001.


The only problem is however Rolland, that those lenses are so expensive, that you can consider to use the Fuji 680 as a film-holder instead, already having tilt/shift possibilities. In my case I have mounted a used Vivitar 135mm enlarger lens, giving me infinity and macro capabilities with focal plane manipulation for about $15. I found out that besides architecture the close-up range lends itself very good for this. The DOF is already even smaller then with 35mm, but with this you can select the area of sharpness. And this lens has a smallest aperture of f 45 ! I have already made some amazing test images.

-- Peter Gooijer (rockrose@freeler.nl), February 09, 2001.


Peter: how many degrees can you tilt the lense with your homebrew device?

-- Roberto Manderioli (ik4jqw@amsat.org), February 11, 2001.

I am digging your "Flex-Pen". I made mine last summer and have been having so much fun with it. My camera forgoes the front standard, it's just a flexible black rubber boot that holds an old folding camera lens to a body cap. Here is my post from last summer:

I did exactly what you describe using an old ('20's) lens liberated from a non-working 6x9 folding camera (the lens covers 4x5). I used a body-cap as a lens mount, first drilled a large hole in it then went to the router table and enlarged the hole. My first attempt at connecting the lens to the lens mount was a failure. My idea was to have the lens mounted on a flexible rubber snoot that I could tweak to get the focus (or lack of focus) that I was after. I tried cutting sheets of rubber glued with cement to make a snoot but the whole thing was unwieldy and ugly. Then I remembered the shift knob boot in my '72 VW and made a trip to the autoparts store. Well, about $30 later I now have a new favorite lens, have used it on a few editorial jobs, and love the affect. I am on my second generation lens, about 2 stops brighter than the first. The current lens is easier to use (brighter) and results in less depth of field. Not sure if I can post picture to this list...but let me know if you want to see the monster. This did not result in a mini-field camera, but that was not the result i was after. -- Abel, August 24, 2000.

-- Abel Sanchez (aamsanchez@hotmail.com), March 23, 2001.


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