Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,276   Posts: 1,534,787   Online: 834
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 17
  1. #1

    Join Date
    Sep 2005
    Shooter
    Medium Format
    Posts
    31
    Images
    5

    Film image not focusing on left side

    I have been testing out a Perkeo 6x6 folding camera. At infinity setting I am getting the center of the negative sharply focused. However, the left side is blurry. See example attachment. This fuzziness is less apparent in shots focused 60 ft or less.
    I have tried measuring the parallelism of the lens and the back film rollers and, within my accuracy limits, they seem OK. The lenses are clean and very clear.

    Any suggestions?
    Attached Thumbnails Attached Thumbnails Court Email.jpg  

  2. #2

    Join Date
    Feb 2005
    Location
    Richmond, VA
    Shooter
    Multi Format
    Posts
    1,066
    Looks like the film is not flat at the exposure plane. I don't know this camera, but can you open the back (or remove the lens), load (sacrifice) a roll of film, advance it across the exposure opening, and see if it is flat?
    If it looks like most folders I've seen, the image would be upside down, so the problem would be on the leading (take-up) side of the film, yes?

  3. #3
    Sirius Glass's Avatar
    Join Date
    Jan 2007
    Location
    Southern California
    Shooter
    Multi Format
    Posts
    13,093
    Look for the problem on the right side of the lens from the back of the camera. The image is flipped around: top on bottom, bottom on top, right on left, left on right.
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  4. #4

    Join Date
    Feb 2005
    Location
    Richmond, VA
    Shooter
    Multi Format
    Posts
    1,066
    As Sirius Glass says, with different words, I came back to this, thought about something else - see if the take-up mechanism is lifting or distorting that right end (looking from the back) when advancing, and leaving it that way. Does this happen on every frame?

  5. #5

    Join Date
    Mar 2007
    Location
    Tallinn, Estonia
    Shooter
    Multi Format
    Posts
    332
    Images
    2
    Is this present on all rolls? The film is not wound tightly over the rollers?
    Or maybe the lens and shutter have been removed and were not put back correctly. Or, on the worst case, the lens has been disassembled and reassembled incorrectly.
    Front standard not locking correctly or maybe wobbling. Where is the shutter release, on the body or on the lens?.

    Such a fuzziness should be apparent even on ground glass, using the loupe. A bit of work of course due the tiny image.

  6. #6
    Mustafa Umut Sarac's Avatar
    Join Date
    Oct 2006
    Location
    İstanbul - Türkiye
    Shooter
    35mm RF
    Posts
    3,821
    Images
    108
    May be you did not strech the film between right roll and left roll. You need to play with winding knob to strech the film before exposing. It must be tight but dont rip the film also.
    My Leica had it , I went a famous repairman 400 kilometers far and he hold the body and pressed the plate with two fingers and everything sat where it might be sit before.
    Press the plate with two first fingers and check from the side , does it parallel to film and cover.

    Good luck ,

    Umut

  7. #7

    Join Date
    Sep 2005
    Shooter
    Medium Format
    Posts
    31
    Images
    5
    Thanks everyone. The standard is rock solid, the film is always wound tightly. I believe the back plate is allowing a movement of the film further away from the lens at the take up side. I have applied a little pressure and it moved. Another test roll I think.
    Once again, I appreciate your ideas and suggestions.

  8. #8

    Join Date
    Sep 2005
    Shooter
    Medium Format
    Posts
    31
    Images
    5
    Correction NOT the left take up side but the right, new roll side.

  9. #9

    Join Date
    Jun 2003
    Location
    local
    Shooter
    Multi Format
    Posts
    16,125
    Blog Entries
    1
    Images
    1
    hi there

    take a piece of waxedpaper and tape it on the film gate / place where your film would sit to be exposed.
    open your shutter up / bulb, and get a loup and focus your camera and see if with the stretched tight
    waxed paper the image is sharp from edge to edge. if it isn't ... your lens is off-kilter
    if it is sharp from edge to edge it might be something like a roller or pressure plate not being right ..

    and you need to have it straightened, unless, you want to use that affect as an effect and have it part of your signature

    good luck !
    john
    Last edited by jnanian; 12-09-2012 at 05:39 PM. Click to view previous post history.
    silver magnets, trickle tanks sold
    artwork often times sold for charity
    PM me for details

  10. #10

    Join Date
    Jul 2006
    Location
    Ohio
    Shooter
    Medium Format
    Posts
    105
    I had a similar problem and it turned out to be the pressure plate not being flat

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