790mm F:5.4 ULF Lens Now Available

Discussion in '[Classifieds] For Sale' started by Reinhold, Jun 20, 2013.

  1. Reinhold

    Reinhold Subscriber

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    It's finally here and ready for your inspection...

    This lens was prompted by Craig T's request for a lens fast enough for alternative photography to cover his 20x24 Chamonix as well as for his mobile Ford Transit Van ("Australia's largest mobile camera") shooting 24"x32" ambrotypes and ferrotypes. Another customer wanted to make life-size portraits with his caravane (trailer). And there are those who are resurrecting the old Century Studio cameras. Let's not forget the folks designing and building their own cameras...

    This is a custom ground lens using the same optical glass as in premium camera filters.
    The diameter and focal length was selected to result in a fast (f:5.4) lens that would project an image circle of at least 1200mm (±48") for negatives/plates of up to 24x30". In reality, the lens covers 32x40" easily and creates a striking 6' diameter camera obscura image. The lens follows the classic Wollaston meniscus design of 1812.

    As with my original lenses, I use PVC materials, in this case the exterior is white PVC. A black finish would be vulnerable to white scratches. If you want brass 'cause it looks cool, the cost would be 3x. It is not small, the lensboard hole must be at least 165mm (6.5") diameter to get maximum coverage without vignetting. If you are shooting smaller, say; 16x20 or 14x18, it may be possible to adapt the lens to interface with smaller boards.

    If you are used to seeing lots of flare with a shorter meniscus lens, you will be pleasantly surprised at how easy it is to use the lens. As focal length and glass diameters increase, the curvature is flatter and flare is significantly reduced. This means that there is a wider zone of transition from a soft/diffuse image to a sharp/crisp image as the lens is stopped down. To take advantage of this wider zone of image formation, I supply aperture cards in 1/2 stop intervals.

    Since a 790mm focal length is quite long, depth of focus is quite short. By utilizing this fact, portraits can be composed so that the subject is in focus and the background falls out of focus quickly, This will emulate the classic sharp center/diffuse background style of historic portraiture.

    The stop card slot is a bit wider so a gel filter could be taped to an aperture card for contrast control or for selective filtering according to your emulsion's chromatic response characteristics. If you want to experiment, blank cards are available for cutting into a "sink strainer" for even more diffusion control.

    The basic lens package includes the lens, six aperture cards in 1/2 stop increments, one blank card as a front lens cover, mounting screws, a cleaning cloth, and a documents packet. The price is $375 plus shipping.

    The accessory package includes a slip-fit front lens cap which doubles as a shutter (please specify knob style), four aperture cards (f:22, f:32, and two blank cards), an expandable folder to keep the cards organized and handy, and a birdcage awl for drilling the screw mounting holes. The price is $49 (plus shipping if ordered separately.

    It's been a while getting this lens ready, thanks for your patience,
    Reinhold

    www.re-inventedphotoequip.com
     

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  2. Reinhold

    Reinhold Subscriber

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    If you decide to order the lens cap kit, please let me know which knob you prefer.
    The white one is wood, painted glossy white.
    The black one is a typical pot lid knob (pedestrian, but functional).
    If you want to finish a wood knob to match your camera, I now have two styles, Mushroom and traditional English.

    Reinhold
     

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  3. Reinhold

    Reinhold Subscriber

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  4. Film Guerilla

    Film Guerilla Member

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    Hi Rein, Do you have a good portrait focal length for 8x10? :smile:
     
  5. Reinhold

    Reinhold Subscriber

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    Hi FG,

    For portrait length, I have a 500mm f:6.9 with an 880mm image circle.
    The next option is 335mm f:5.6 with a 510mm circle.
    I'd consider 335mm to be too short for portrait work, but that's your choice.

    Reinhold

    Here's a summary of my current offerings, plus a drawing of the general configuration:
     

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  6. Film Guerilla

    Film Guerilla Member

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    Thanks. I've contacted you about KMV board before. If ever i will get a lens i hope i could get one with a KMV lensboard.
    335mm is too short for me and the 500mm is a bit long. I was thinking of 360-410mm but let see.

    Thank you!



     
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  7. Reinhold

    Reinhold Subscriber

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    You folks have been keeping me quite busy lately...

    Reinhold
     

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  8. Curt

    Curt Subscriber

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    Hello Reinhold,

    I'm completing my Rosewood / Ebony 11x14 view camera, when the last two knobs arrive from Germany that is. Besides my Artars and Others what can you recommend for a "normal" to "long" lens? Schneider, Nikon, or Fuji in Copal shutter with a 360 - 450 range? Or an older lens? Even with long exposures I still like a shutter.

    Curt
     
  9. Reinhold

    Reinhold Subscriber

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    Hello Kurt,

    Some time ago, I made a drawing which extrapolates the data in a nomograph I found in a Kodak Technical Handbook.

    Using the traditioal rule of thumb which suggest that a "normal" lens focal length is about the same as the diagonal of the film, a "normal" lens for 11x14 would be about 450mm.

    By the Kodak data, 450mm would be considered a "short normal" (120mm on a 4x5).
    I use a 450 on my 8x20 Canham as a "short normal" lens. (8x20 diagonal is the same as 11x14)

    By Kodak, 600mm is closer to a tru "normal" for 11x14 and 8x20. (165mm on a 4x5)
    I use a 600mm on my 8x20 as a "normal normal" lens.

    By Kodak data, "moderate telephoto" would be in the 760 to 850mm range. (200~210mm on a 4x5)
    I use a 760mm Rodenstock Apo-Ronar as my "moderate telephoto" lens on my 8x20.

    My .pdf graphic may be a bit hard to read, I made the lines and text too small, but here it is four your edification...

    Oh, and if you're asking if I have a lens for sale, that 760 Apo-Ronar is available here:
    http://www.apug.org/forums/forum379/108092-760mm-30-inch-f-14-rodenstock-apo-ronar-copal-3-a.html

    Reinhold
     

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  10. jnanian

    jnanian Advertiser Advertiser

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  11. Reinhold

    Reinhold Subscriber

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  12. StoneNYC

    StoneNYC Subscriber

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    I love the 35mm (Kodachrome?) cans in the background ... cause I'm sure you would use 35mm film in one of those 20x24 cameras... haha I wonder how many strips of 35mm would be required to cover the surface haha. :smile:
     
  13. StoneNYC

    StoneNYC Subscriber

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    PS, what kind of focal length would we be talking if this were somehow be able to be mounted on a 4x5 camera (yes I know the glass is bigger than the damn piece of film haha, just go with it). :smile:

    EDIT: I mean equivalent for the surface area size of the film ...
     
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  14. Reinhold

    Reinhold Subscriber

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    The old rule of thumb when developing film was that one 8x10 film was the equivalent to one 36 exposure roll of 35mm film. A lazy parallelism would be that one 20x24 would equal six 35 exposure rolls of 35mm film. Izzat close enuff, or are you going to force me into breaking out my slide rule?... (If I can find it...)

    Reinhold
     
  15. StoneNYC

    StoneNYC Subscriber

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    Haha close enough for sure :smile:

    Really cool... and here I am saving up for a Toyo45a haha


    ~Stone | Sent w/ iPhone using Tapatalk
     
  16. Curt

    Curt Subscriber

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    A delayed thanks for the chart and the lens offer.

    Curt
     
  17. Reinhold

    Reinhold Subscriber

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