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  1. #11

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    Quote Originally Posted by jjstafford
    And to the Wide focal lengths, this on a Sinar 4x5
    And at the short end, here's a 1.75"/2.8 Elcan on a 2x3 Pacemaker Speed Graphic. The lens is focused to infinity. For those who speak only metric, that's 44 mm. Doesn't cover 2x3, though, clips the corners. Illuminates 90 mm.

    Cheers,
    Attached Thumbnails Attached Thumbnails 1.75 inch elcan on speed bs.jpg  

  2. #12
    bobfowler's Avatar
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    Quote Originally Posted by jimgalli
    OK Dan, time to quit messing around and get "Big Bertha"!

    <snip out the image>

    Of course those were 1959 $$ when a new Ford was only about double that so 20 grand ought to do it. I don't think I can survive another day without 40 inch TTL focus on a rollfilm back!
    A camera from when men were men and sheep were nervous!
    Bob Fowler
    fowler@verizon.net
    Some people are like Slinkies. They're really good for nothing, but they still bring a smile to your face when you push them down a flight of stairs.

  3. #13

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    Quote Originally Posted by Dan Fromm
    Tom, I have a 600 Apo Ronar that weighs 8 pounds. Wanna trade?

    Dan
    I already have one of those, Dan - can't find it right now though...
    Tom Hoskinson
    ______________________________

    Everything is analog - even digital :D

  4. #14

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    Great looking camera(s) Dan, but where's the photo taken _by_ the camera??

  5. #15
    Ole
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    Quote Originally Posted by Dan Fromm
    Tom, I have a 600 Apo Ronar that weighs 8 pounds. Wanna trade? I've designed additional bracketry for mounting the Apo Ronar, am convinced that on my setup it it will cover nominal 6x6 at best. The nicest thing about the additional bracketry is that I can fabricate it myself. Had to farm out fabrication of the current set of brackets and especially the coupler that goes between the cameras...
    Dan, I have a nice little Schneider Göttingen Aertotar 500mm f:6.6 that could use some bracketing - the only camera I have with a front strong enough to hold it doesn't have enough extension... Besides it's a tele design, flange focal distance about 40cm. But that old German Reisekamera only goes to 32cm. A 20cm tube? Large catfood tin (empty)?
    -- Ole Tjugen, Luddite Elitist
    Norway

  6. #16

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    Quote Originally Posted by Ole
    Dan, I have a nice little Schneider Göttingen Aertotar 500mm f:6.6 that could use some bracketing - the only camera I have with a front strong enough to hold it doesn't have enough extension... Besides it's a tele design, flange focal distance about 40cm. But that old German Reisekamera only goes to 32cm. A 20cm tube? Large catfood tin (empty)?
    Ole, what do you intend to use for a shutter?

    I made the tandem rig instead of building a monorail incorporating my 2x3 Speed with (a) a moveable front standard or (b) a rack and pinion device for moving the Speed fore and aft for focusing. The monorail seemed much harder and more expensive to realize.

    The potential problem I see with your Aerotar is that the rear node (or perhaps I should have said exit pupil) is ~ 10 cm in front of the back of the lens. You'll need to put the shutter as close to the back of the lens as possible to reduce the chances of vignetting. Reasoning from similar triangles, if the shutter is at the back of the lens, to cover the format you need a shutter whose diameter/10 cm >= 150/500, i.e., whose diameter wide open >= 3 cm. So a #1 will just do, and larger would be better.

    How big is your Reisekamera's lens board? If its front standard will bear the load, you might make a tube out of PVC pipe. Stronger than a coffee can, easy to machine.

    Good luck, go on having fun,

    Dan

  7. #17
    Ole
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    Quote Originally Posted by Dan Fromm
    Ole, what do you intend to use for a shutter?
    ...
    How big is your Reisekamera's lens board? If its front standard will bear the load, you might make a tube out of PVC pipe. Stronger than a coffee can, easy to machine.

    Good luck, go on having fun,
    ...
    I just started thinking about building an extension with a Packard shutter in - since I happen to have one, I mean The lens board currently holds an Iris mount with 4½" opening, total diameter about 6". That's why I bought that camera, it was cheaper than the mount alone! And it's a classic rear focus "Reisecamera" - the front is rigid, there in no front standard at all!

    I haven't checked if a catfood tin will fit in the iris yet. Hmmmm - lots of fun when I get home!

    On the other hand I might put the iris mount on the Russian 30x40cm camera that's on the way - lensboard even bigger, construction if possible stronger, and none of my 5x7" lenses will cover. My best candidates are a Steinheil Patent #6, and a slightly newer Lancaster & Son "Patent Rectilinear" 12x10". I was a bit disappointed that the Aerotar was a tele lens, that reduces the chances of covering 500mm considerably
    -- Ole Tjugen, Luddite Elitist
    Norway

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