Mounting 80mm Enlarger Lens over Pentax 6x7 - Any Ideas How?

Hi,

I am shooting macro images and have just bought a used Pentax 6x7
body, no lens. Instead of using Pentax's lens, I'll be placing an
80mm El-Nikkor enlarging lens over the P67. The coverage of the lens
is large enough and the image it throws on the film plane looks nice
and sharp at the right distance - so technically no problem here,
except I'm not sure how to mount the lens to hold it in place. (Just
a minor practical problem I failed to think through.)I'm thinking of
building a threaded ring so I can adjust the distance of the lens from
the film by turning the lens. Can anyone suggests places where I can
buy the parts or materials which I can adapt for my purposes? Thanks.

Nelson

In article ,
(Nelson Win) wrote:

Hi,

I am shooting macro images and have just bought a used Pentax 6x7
body, no lens. Instead of using Pentax's lens, I'll be placing an
80mm El-Nikkor enlarging lens over the P67.

I'm sure Bob M will chime in here with a URL. If I weren't in a rush at
the moment I'd surf his site to find references.

Short answer - get the #1 extension tube, some PVC pipe, epoxy cement and
gaffer's tape and put it together. Just make sure surfaces are
perpendicular to the axis and have fun.

In article ,
(Nelson Win) wrote:

Hi,

I am shooting macro images and have just bought a used Pentax 6x7
body, no lens. Instead of using Pentax's lens, I'll be placing an
80mm El-Nikkor enlarging lens over the P67. The coverage of the lens
is large enough and the image it throws on the film plane looks nice
and sharp at the right distance - so technically no problem here,
except I'm not sure how to mount the lens to hold it in place. (Just
a minor practical problem I failed to think through.)I'm thinking of
building a threaded ring so I can adjust the distance of the lens from
the film by turning the lens. Can anyone suggests places where I can
buy the parts or materials which I can adapt for my purposes? Thanks.

Nelson

The Novoflex BALPRO 1 bellows system will mount to a Pentax 67 and
accept a Leica thread lens. (or any other 35mm camera and most 2 1/4
camera lenses).

http://www.novoflex.com/english/html/products.htm

--
To reply no_ HPMarketing Corp.

I am shooting macro images and have just bought a used Pentax 6x7
body, no lens. Instead of using Pentax's lens, I'll be placing an
80mm El-Nikkor enlarging lens over the P67. The coverage of the lens
is large enough and the image it throws on the film plane looks nice
and sharp at the right distance - so technically no problem here,
except I'm not sure how to mount the lens to hold it in place. (Just
a minor practical problem I failed to think through.)I'm thinking of
building a threaded ring so I can adjust the distance of the lens from
the film by turning the lens. Can anyone suggests places where I can
buy the parts or materials which I can adapt for my purposes? Thanks.

A toilet paper tube and some duct tape?

JEEZ...where do you people come up with this nonsense?

In article ,
(Nelson Win) wrote:

Hi,

I am shooting macro images and have just bought a used Pentax 6x7
body, no lens. Instead of using Pentax's lens, I'll be placing an
80mm El-Nikkor enlarging lens over the P67. The coverage of the lens
is large enough and the image it throws on the film plane looks nice
and sharp at the right distance - so technically no problem here,
except I'm not sure how to mount the lens to hold it in place. (Just
a minor practical problem I failed to think through.)I'm thinking of
building a threaded ring so I can adjust the distance of the lens from
the film by turning the lens. Can anyone suggests places where I can
buy the parts or materials which I can adapt for my purposes? Thanks.

Nelson

Another way would be to take a Pentax 67 body cap and have a machinist
bore it out to accept the Rodenstock Modular Focus tube. This is used
mainy to mount Leica thread or 32.5mm thread lenses to 35mm cameras or C
mount cameras. But would work on 2 1/4 with the proper adaptation to
adapt it to the camera. 25mm long extension tubes are made for it to get
the proper distance for infinity focus.

http://www.hpmarketingcorp.com/rodenstock.html

However enlarging lenses are not the best quality for infinity work.
They are excellent for macro, especially when reversed. Don't forget to
block off the illuminated aperture port or you may get funny colors on
your film.

--
To reply no_ HPMarketing Corp.

"Randall Ainsworth" wrote in message
...

A toilet paper tube and some duct tape?
JEEZ...where do you people come up with this nonsense?

Tech call! Are we supposed to remove the paper from the roll first? We can
posit a dozen advantages to leaving it on or off, then we can argue about
the merits of scented, plain, double and single ply. Finally we can whine
that the advertising image of cute huggable toy bears diminishes our serious
dedication to hardware.

jjs wrote:

"Randall Ainsworth" wrote in message
...

A toilet paper tube and some duct tape?
JEEZ...where do you people come up with this nonsense?

Tech call! Are we supposed to remove the paper from the roll first? We can
posit a dozen advantages to leaving it on or off, then we can argue about
the merits of scented, plain, double and single ply. Finally we can whine
that the advertising image of cute huggable toy bears diminishes our serious
dedication to hardware.


You missed what seems to be an obvious issue. Needing to paint the inside
flat black. Leaving the paper on would be a positive I think. It would
provide a soft comfortable hand hold. Help make sure the tube is light
tight. I'd avoid scented. Who knows what chemicals are used and how they
might react with everything else.

Nick

"Nick Zentena" wrote in message
...
jjs wrote:

You missed what seems to be an obvious issue. Needing to paint the
inside
flat black.

Heresy! Only black flocking paper would be appropriate. Wait, I wonder if we
just didn't stumble across a new product: black flocked toilet paper.

"Nelson Win" wrote in message
om...
Hi,

I am shooting macro images and have just bought a used Pentax 6x7
body, no lens. Instead of using Pentax's lens, I'll be placing an
80mm El-Nikkor enlarging lens over the P67. The coverage of the lens

I expect the light pipe that illuminates the aperture ring will add some
flare light. I don't know how significant this will be.

I would think Pentax makes a bellows set for macro work.

On Tue, 18 May 2004 09:40:28 -0500, "jjs" wrote:


"Randall Ainsworth" wrote in message
.. .

A toilet paper tube and some duct tape?
JEEZ...where do you people come up with this nonsense?

Tech call! Are we supposed to remove the paper from the roll first? We can
posit a dozen advantages to leaving it on or off, then we can argue about
the merits of scented, plain, double and single ply.

On the (w)hole, it's all pretty much the same....