Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,538   Posts: 1,544,278   Online: 794
      
Page 2 of 2 FirstFirst 12
Results 11 to 18 of 18
  1. #11
    StoneNYC's Avatar
    Join Date
    Aug 2012
    Location
    Connecticut, USA
    Shooter
    8x10 Format
    Posts
    7,331
    Images
    225

    120-135 lens that vignettes on 4x5?

    Quote Originally Posted by ic-racer View Post
    Not all old brass lenses give a "Holga" effect. This is an Anthony lens from 1890s wide open: It is sharp right up to the edge and cuts off rather abruptly like a modern lens.
    Sorry to interject, gorgeous shot!


    ~Stone

    The Noteworthy Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic

    Sent from my iPhone using Tapatalk
    ~Stone | "...of course, that's just my opinion. I could be wrong." ~Dennis Miller

  2. #12

    Join Date
    Mar 2005
    Shooter
    Multi Format
    Posts
    3,399
    You're not going to get a lot of optical vignetting (cos^4 falloff) from a 120 mm lens on 4x5. You'll probably get substantial image degradation towards the corners with a lens around 120 mm made for a 6x6 or 6x7 camera.

    Your best best at 4-5 feet would be a shorter lens made for a 6x6 camera. And it won't give you exactly what you want.

  3. #13

    Join Date
    Sep 2011
    Location
    Olympia, wa.
    Shooter
    35mm
    Posts
    241
    How about two series 5 or series 6 close up lenses. If mounted concave to concave a plus 3 and a plus 4 would be a plus 7, about 143mm. Put a thin brass stop inside, about a 17 mm hole should give you f8.5 with plenty of fall off. Don't know what to do about a shutter.

  4. #14

    Join Date
    Jun 2003
    Location
    Portland, Oregon
    Posts
    1,338
    How about an 80mm enlarging lens?

    Peter Gomena

  5. #15
    Denis P.'s Avatar
    Join Date
    May 2004
    Location
    Croatia
    Shooter
    Multi Format
    Posts
    466
    Images
    9
    Ben,

    Your best bet might be either:

    1) a lens designed for smaller format (6x6 cm or 2x3 in), e.g. lenses for 2x3 Speed Graphics (or Century Graphics), like the 101/4.5 Ektar or Optar, or similar, or a lens scavenged from a medium format (6x6 or 6x9) folder. However, in this case you're limited to focal lengths ranging from about 80mm (6x6 format) to about 105mm (2x3 format).

    2) some DIY lens hacking - mix and match various lens cells in an existing shutter - or use close-up (diopter) lenses, as already mentioned. You could try one of the lenses mentioned under 1) above, and try removing/swapping lens elements with other lenses, close-up diopters, etc.

    Most of the lenses in shutter in the focal lengths you mention (120-135mm) will cover 4x5 without serious vignetting - at least not as pronounced as in a Holga. The Kodak Ektar 127 that Andrew mentioned does not really vignette on 4x5: well, it actually does when you try movements, but only on the side which ran out of coverage (not what you want).

    Now that I think of it, there might be a third solution: you could try 135mm lens from a Mamiya TLR, but I'm not sure about its coverage and vignette characteristics (if any) when used on 4x5 format.

    If you're willing to forego the shutter, your options increase with many older barrel lenses you might try.

  6. #16

    Join Date
    Mar 2004
    Location
    San Francisco Bay Area
    Shooter
    Multi Format
    Posts
    833
    Images
    42
    I have actually mounted the Agfa Solinar 105mm from my Record III on a 5x4. This is a tessar-type lens and normal for 6x9cm. It illuminates 5x4, but gets soft outside of the intended 6x9 frame. It does not vignette at the corners - you would have to put it on a 5x7 to see the corners really darken. The Synchor-Compur shutter has the close to circular iris mentioned originally, though the lens also mounts in a standard Copal 0 shutter.

    I suspect that any lens designed as 'normal' i.e. a focal length close to the diagonal of the format won't work for corner vignetting at the focal lengths you want. You probably need a projection lens of some sort.
    I feel, therefore I photograph.

  7. #17

    Join Date
    Mar 2007
    Location
    Ithaca, NY and Chicago, IL
    Shooter
    Large Format
    Posts
    21
    Grabbed a cheap 135 Mamiya TLR lens on eBay tonight - we'll see what that does in a few days. I have the 127/4.7 Ektar and that does indeed cover 4x5, at least any closer than infinity. Checked a 101 Raptar which seems to cover too well also. Will test other options as time allows. Even 6x9 lenses would fill the narrow dimension of the 4x5 frame though, I think.

    Thanks for suggestions.

    Ben
    Last edited by Ben Altman; 12-16-2012 at 10:31 PM. Click to view previous post history.

  8. #18

    Join Date
    Mar 2007
    Location
    Ithaca, NY and Chicago, IL
    Shooter
    Large Format
    Posts
    21
    Update - the Mamiya 135 TLR lens comes close to what I want if I use it wide open. A bit more coverage than I want but it does fall off towards the sides. Corners are dark but a bit more abrupt than I'd like. Not bad, though. May try some mechanical vignetting too. It's hard to get something as bad as a Holga lens... Thanks Denis for the suggestion.

    Ben

Page 2 of 2 FirstFirst 12


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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