Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 68,646   Posts: 1,481,267   Online: 716
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    Reinhold's Avatar
    Join Date
    Aug 2003
    Location
    Washougal, Washington
    Shooter
    Multi Format
    Posts
    671
    Images
    14

    Soft Portrait Meniscus Lens, Mounted

    Here's a 285 mm f 4,9 soft portrait simple meniscus lens, all mounted and ready to go...

    This lens is aimed primarily at the 5x7 large format portrait camera user.
    (You'll need 285mm of bellows draw just to focus at infinity).
    While it will throw an image well over 14" diameter, light fall-off must be expected from this most basic of all photographic lenses. Focused at 10 feet (3 meters), the field of view is about 4.5 feet (1.4 meters) wide

    If I get enough interest, I'll make one for 4x5 (somewhere around 150 ~ 180mm)...

    Being a simple positive meniscus lens, using it wide open results in very soft and "dreamy" image. Using progressively smaller aperture cards will increasingly sharpen the image. The attached portraits were made using the 35mm diameter (f8.0) aperture card.

    Focusing a wide open meniscus lens is challenging, especially in low contrast lighting. Pre-focusing using a card one-stop larger makes focusing easier.

    Five aperture cards (aka: "Waterhouse Stops") from f4.5 to f16 are included.
    The aperture cards have a simple chart listing effective apertures at 10' and 3' focusing distances. The cards are die-cut from black & white matboard, the black side faces the film, the white side is for making notations...

    The lens itself is a positive meniscus glass lens from a well known supplier of surplus optical components and has been mounted in a machined barrel.
    The lens barrel is 3" long x 2-7/8" diameter PVC tubing.
    The lens itself is mounted 15mm in front of the flange (this amounts to a 15mm "extended lensboard").
    The card slot abuts an internal ledge which acts as a light trap to minimize light spill around the edges of the card during exposure.

    The PVC flange is 3-5/8" diameter, 3-3/8" across the flats.
    Four countersunk screw holes for #4 flat head mounting screws.
    Specify if you'd like brass or stainless screws. (#4 x 3/8")
    A lens board hole of about 2-1/4" diameter (60mm) is suggested.

    $65 + shipping.

    Reinhold

    www.classicBWphoto.com
    Attached Thumbnails Attached Thumbnails Jim @ 96.jpg   IMG_0124.JPG   IMG_0121.JPG   Larry @96.jpg  

  2. #2
    Two23's Avatar
    Join Date
    Jul 2010
    Shooter
    4x5 Format
    Posts
    268
    This is pretty cool! I've been looking at Hermagis meniscus lenses for my 4x5. I'm impressed.


    Kent in SD

  3. #3

    Join Date
    Jan 2010
    Shooter
    4x5 Format
    Posts
    10
    If you build one in 4x5 I would need to have it LOL Pretty images

  4. #4
    Jeff Bannow's Avatar
    Join Date
    Mar 2007
    Location
    Royal Oak, MI
    Shooter
    Medium Format
    Posts
    1,754
    Images
    41
    Very nice! How would this perform for whole plate or 8x10?
    - Jeff (& sometimes Eva, too) - http://www.jeffbannow.com

  5. #5
    Reinhold's Avatar
    Join Date
    Aug 2003
    Location
    Washougal, Washington
    Shooter
    Multi Format
    Posts
    671
    Images
    14
    Jeff,

    I wish I had an 8x10 to try it on...
    I did a rough preview with my 8x20, and could see an image almost all the way across 20 inches (wow).
    But judging light fall-off is a guessing game at best.

    Maybe one of the optical experts among us could calculate fall-off at various radii (lens focal length -vs- image circle).

    I'm half tempted to sacrifice a sheet of film just to see how it works...

    To address your question directly;
    You will get full coverage across 8x10.
    Vignetting (a distinct edge) is not visible.
    Light fall-off is plainly evident at a 14" image circle.
    My guess... at 12" (the approximate diagonal of 8x10) fall-off would be about 1 stop at the corners.

    I gotta go borrow an 8x10...

    Reinhold

    www.classicBWphoto.com

  6. #6
    gandolfi's Avatar
    Join Date
    Jan 2005
    Location
    Denmark
    Shooter
    Large Format Pan
    Posts
    1,764
    Images
    387
    cool.
    I bet it will look great at 8x10!

    I have several meniscus type lenses and they are so much fun to use!!

    first example: small Lancaster meniscus on 4x5 ("too" big for that lens..)

    secondallmeyer meniscus on 13x10 (clost to 5x7)

    Addictive!
    Attached Thumbnails Attached Thumbnails lancaster-Stine-01.jpg   dallmeyer6.jpg  

  7. #7
    Reinhold's Avatar
    Join Date
    Aug 2003
    Location
    Washougal, Washington
    Shooter
    Multi Format
    Posts
    671
    Images
    14
    For those of you wondering if this lens would work on a 4x5 camera, here are a few numbers:

    My Tachihara has 12" (305mm) max bellows draw.
    With this lens on my Tachi., the closest I can focus is 6'-3" (1.9 meters).
    The field of view is 21" (533mm) or about the width of my shoulders (I'm of slight build).

    So this lens will do a "head and shoulders" portrait (vertical format) on a 4x5 camera.

    If your camera has 16" (406mm) bellows draw, you can focus as close as 40" (1.0 meters).

    Reinhold

    www.classicBWphoto.com

  8. #8

    Join Date
    Dec 2010
    Location
    Santa Ana, CA
    Shooter
    Medium Format
    Posts
    41
    I would be interested in the aforementioned 150-180mm 4x5 lens. Let me know if you decide to make any.

    Thanks
    Ryan

  9. #9
    Reinhold's Avatar
    Join Date
    Aug 2003
    Location
    Washougal, Washington
    Shooter
    Multi Format
    Posts
    671
    Images
    14
    I should have said that the field of view is 21 x 26 inches (533 x 660 mm) on 4x5 film when focused at 6'-3"

    Reinhold

    www.classicBWphoto.com

  10. #10
    guissimo's Avatar
    Join Date
    Mar 2005
    Location
    California
    Shooter
    Medium Format
    Posts
    116
    Images
    6
    Yeah, I would also be interested in a lens for a 4x5. Thanks.

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin