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  1. #1
    Senior Member
    Bob Blaylock's Avatar

    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f/3.8 Tele-Zoom

    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom
    It got into my head to set my ancient Vivitar 85-205mm ƒ/3.8 Tele-Zoom lens up on a fixed scene, and take pictures at different aperture settings, to show the effect of aperture on the depth of field and image quality. I ended up doing it twice, with the lens zoomed all the way to 205mm, and again zoomed in to 85mm.

    This is an ancient, non-AI lens built in the late 1960s or early 1970s. See also, this thread for a similar treatment of my equally-ancient 50mm ƒ/1.4 Nikkor.

    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-csc_3391.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-csc_3390.jpg
    [In case anyone is wondering, the text that is lost in the glare in both of the above pictures, just clockwise of the serial number and counterclockwise of the “Vivitar” name, is “AUTO”.]

    Aside from depth of field, this lens has some rather interesting distortions that occur at wider aperture settings.

    So, here are the results. Note that aperture setting, focal length, and other lens-specific characteristics are not correctly recorded in the EXIF data of the following images, due to the fact that this is not a CPU lens, and does not provide these data to the camera.

    ƒ/3.8:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3374.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3367.jpg

    ƒ/5.6:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3375.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3368.jpg

    ƒ/8:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3376.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3369.jpg

    ƒ/11:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3377.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3370.jpg

    ƒ/16:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3378.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3371.jpg

    ƒ/22:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3379.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3372.jpg



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    Last edited by Bob Blaylock; 09-12-2015 at 02:07 AM. Reason: May Laurence Tureaud have compassion toward you. — http://tinyurl.com/LaurenceTureaud
    Thanks/Like Bill16, Philnz Thanks/liked this post
     



  2. #2
    Senior Member
    PapaST's Avatar

    Re: Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom

    Wow, that's a cool lens. What was your distance to the subject?
    Thanks/Like Bill16 Thanks/liked this post
     

  3. #3
    Senior Member

    Re: Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom

    That's pretty cool. Although the bokeh isn't like todays lens's for some reason. Look's somewhat different.

  4. #4
    Senior Member
    Bob Blaylock's Avatar

    Re: Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom

    Quote Originally Posted by PapaST View Post
    Wow, that's a cool lens. What was your distance to the subject?
    I had intended to measure that distance before I took everything down, and forgot to do so. I can only now give a rough estimate that it was certainly at least six feet, and probably not more than ten feet, from my camera, to the Hershey's bar on which the lens was focused.

  5. #5
    Senior Member
    Philnz's Avatar

    Thumbs up Re: Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom

    Quote Originally Posted by Bob Blaylock View Post
    It got into my head to set my ancient Vivitar 85-205mm ƒ3.8 Tele-Zoom lens up on a fixed scene, and take pictures at different aperture settings, to show the effect of aperture on the depth of field and image quality. I ended up doing it twice, with the lens zoomed all the way to 205mm, and again zoomed in to 85mm.

    This is an ancient, non-AI lens built in the late 1960s or earlier 1970s.

    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-csc_3391.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-csc_3390.jpg

    Aside from depth of field, this lens has some rather interesting distortions that occur at wider aperture settings.

    So, here are the results. Note that aperture setting, focal length, and other lens-specific characteristics are not correctly recorded in the EXIF data of the following images, due to the fact that this is not a CPU lens, and does not provide these data to the camera.

    ƒ3.8:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3374.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3367.jpg

    ƒ5.6:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3375.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3368.jpg

    ƒ8:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3376.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3369.jpg

    ƒ11:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3377.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3370.jpg

    ƒ16:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3378.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3371.jpg

    ƒ22:
    Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3379.jpg Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom-dsc_3372.jpg
    After all that hard work I hope you got to eat the sweets
    Phil. Ngatea New Zealand
    Life is like a camera
    Focus on what is important
    Develop from the negatives
    And if things don't work out
    Take another shot.

  6. #6
    Senior Member
    Bob Blaylock's Avatar

    Re: Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom

    Quote Originally Posted by Philnz View Post
    After all that hard work I hope you got to eat the sweets
    Alas, no. I'm diabetic. What candy and sweets we keep around are for my wife. Or for me to use as photographic subjects.

  7. #7
    Senior Member
    Challenge Team
    cwgrizz's Avatar

    Re: Aperture/Depth_of_field Relationship -- Vivitar 85-205mm f3.8 Tele-Zoom

    Bob, Nice visual demo. Thanks for taking the time to do this.
    Walt

    D750; D7100; D5300;
    18-55mm f/3.5-5.6 G II VR; AF-S VR 70-300mm f/4.5-5.6 G IF-ED; AF-S 85mm f1.8; Tokina 11-16mm f2.8 (IF) DX II; 200-500mm f5.6E ED VR; AF-S VR 24-120mm f/4G ED; TC14E II







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