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  1. #1
    Join Date
    Mar 2009
    Location
    Netherlands
    Posts
    76

    Minolta 35-70 F4

    I got a Minolta 35-70 F4 lens yesterday but I think I got a problem.

    On F4 the shot is very good but if I go smaller it becomes very light. At a minimum of 22 the shot is white. I can go to 5,6 then it is still good but after that it is too light.

    Any ideas of what can be wrong or what I do wrong?

  2. #2
    Join Date
    Dec 2006
    Location
    God's Country - Australia
    Posts
    10,424
    post some samples with exif.
    D800e l V3 l AW1 l 16-35 l 35 l 50 l 85 l 105 l EM1 l 7.5 l 12-40 l 14 l 17 l 25 l 45 l 60 l 75
    flickr

  3. #3
    Join Date
    Mar 2009
    Location
    Netherlands
    Posts
    76
    Will follow soon.

  4. #4
    Join Date
    Mar 2009
    Location
    Netherlands
    Posts
    76
    Here are some samples. They are all taken at the same time of the day. This is the only lens that is doing this.


    Minolta 35-70 F4
    Alpha A300
    App: F22
    Shutt: 1/80 sec
    35 mm
    ISO: 200


    Minolta 35-70 F4
    Alpha A300
    App: F11
    Shutt: 1/320 sec
    35 mm
    ISO: 200




    Minolta 35-70 F4
    Alpha A300
    App: F4
    Shutt: 1/2500 sec
    35mm
    ISO: 200

  5. #5
    Join Date
    Dec 2006
    Location
    Guelph, Ontario
    Posts
    1,903
    your aperture is stuck.
    hold the lens only in your hand and move the aperture spring. see if iris expand and retract trough the lens when you do it!
    Last edited by Elisha; 05-10-2009 at 07:55 AM.
    Canon EOS 7D

    flickr
    FLUIDR

  6. #6
    Join Date
    Jun 2008
    Posts
    73
    that is happening also to the 35-70 f/4 of my friend. don't know if this is common to the 35-70 of minolta.

  7. #7
    Join Date
    Dec 2006
    Location
    Guelph, Ontario
    Posts
    1,903
    it happened to my Beercan. i had to take it apart myself and align the iris actuator to the plastic piece above the aperture blades.
    Last edited by Elisha; 05-10-2009 at 07:55 AM.
    Canon EOS 7D

    flickr
    FLUIDR

  8. #8
    Join Date
    Dec 2006
    Location
    Guelph, Ontario
    Posts
    1,903
    here's the guide for disassembly: http://www.pbase.com/pganzel/maxxum_3570_f4_disassembly

    this is the picture of the actuator in place: http://www.pbase.com/pganzel/image/98807093
    Canon EOS 7D

    flickr
    FLUIDR

  9. #9
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560
    Sounds like you guys are on the right track with this problem. The lens' aperture action would appear to be the culprit. I had issues with my SONY 70-200mm f/2.8 G SSM not responding to the aperture arm of the A700 ... it would not close-down. I had f/2.8 ALL DAY! The new lens went back. The problem you describe almost sounds like it is working bass-ackwards!

    The only thing is ... from f/4 ("normal exposure" or 0 Ev) to f/22 (-4 Ev) ... at the same speed and ISO ... the f/22-image would more than likely be black. -4 Ev on anything is kind of a seriously harsh change in exposure.

    A similar change in ISO would be like going from ISO-3200 -> ISO-200

    or shutter-speed wise ... from 1/30 sec -> 1/500th!

    Just screwing around, turning and shooting out of a "screened" window (which diffuses the focus a bit),
    w/ the 35-70 f/4 @ f/4 (0 Ev) - Same Shutter speed and ISO for both shots.
    Name:  f4-35-70-0-Ev-test.jpg
Views: 1912
Size:  273.4 KB

    and then f/22 (-4 Ev)
    Name:  f4-35-70-minus-4-Ev-test.jpg
Views: 1707
Size:  63.0 KB

    "Where did the light go?"

    BTW: You can't shoot this kind of test indoors, with this lens ... as it is effectively black at both apertures. LOL Okay, okay ... I know, adjust for Ev shift ... but still, f/4 indoors? Where's my flash?

    This was one of 'Peek's' favorite lens. I wonder what he's been up to? Personally, I recommend upgrading to a real digital lens, like the TAMRON SP AF 28-75mm f/2.8 XR DI LD Aspherical (IF), if this is your range choice. Focus is sharper ... aperture is wider ... focal length wider ... just better choices all around.

    TAMRON SP AF 28-75mm f/2.8 XR DI LD Aspherical (IF) @ 0 Ev
    Name:  f4-28-75-0-Ev-test.jpg
Views: 2332
Size:  250.5 KB
    Last edited by DonSchap; 05-10-2009 at 11:01 AM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

  10. #10
    Join Date
    Mar 2009
    Location
    Netherlands
    Posts
    76
    I thought that if it is stuck in the F4 position the at F22 with the 1/80 sec shutter speed the photo would be dark or am I sitting next to the pot now?

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