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  1. #1
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
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    9,560

    Lightbulb Minolta "WHITE" caps

    I'm not sure how many of you may have gotten a white rear lens cap with your lens, but they are a little different than the usual black ones.

    For one thing, they have a protruding blade on the inside that actually actuates the aperture blades as you tighten it down, until the aperture was set wide open.

    Here it is on the SONY 50mm f/1.4 and the SONY CZ 135mm f/1.8

    Name:  Aperture-fights.jpg
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Size:  173.8 KB

    Also, if your lens is 135mm or longer, you can actually get an image to present on the rear cap, by manual focusing to sharpness.

    The scene with the lens

    Name:  scene-with-lens.jpg
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Size:  167.4 KB

    The scene ... in the lens!
    Name:  scene-in-lens.jpg
Views: 92
Size:  192.4 KB

    Just a little something extra to think about with these older Minolta "WHITE" caps.
    Last edited by DonSchap; 01-24-2009 at 09:54 PM.
    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

  2. #2
    Join Date
    Dec 2007
    Posts
    2,562
    Why do you want to store your lenses with the aperture open??

    Frank
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  3. #3
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560
    I guess it keeps the spring working ... and also looks cool on the display shelf. You have one of those in the house, don't you? You know, for your equipment, when you unload your backpack and are not toting it all around with you.
    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

  4. #4
    Join Date
    Jun 2008
    Posts
    2,204
    lol interesting, wouldn't that stretch out your spring, by keeping it compressed?
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

  5. #5
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560

    Smile

    dr4gon ... this is a Minolta-design.

    Name:  white-cap-logo.jpg
Views: 94
Size:  305.9 KB

    I think they knew what they wanted to do ... so, I'm good with it.
    Last edited by DonSchap; 01-24-2009 at 09:53 PM.
    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

  6. #6
    Join Date
    Jun 2008
    Posts
    2,204
    ... just questioning they're logic. (well since it is no longer around)
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

  7. #7
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    The old black ones are the same. I have a Sony Cap (not sure how) that is the same as well.
    Obviously this design is bad for the spring, but I think it relieves pressure on the Iris Blades.

  8. #8
    Join Date
    Dec 2007
    Posts
    2,562
    I did a check of all my back caps and all of them have it as well.

    Frank
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  9. #9
    Join Date
    Oct 2008
    Location
    Indiana, USA
    Posts
    52
    As I twist the rear lens cap on all my Sony lenses and look down the front end I can also see the aperture blades open and close on them. Now on the other hand it is not that way with my Tamron lenses with their rear caps.
    Last edited by Tom F; 01-25-2009 at 06:38 AM.
    Sony α900
    Zeiss 16-35mm f/2.8, Zeiss 24-70mm f/2.8, Sony 70-200 F/2.8 G, Sony 100mm F/2.8 Macro

  10. #10
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560
    Yep ... oops ... the black ones, too. How did that rascal get by me? The TAMRON caps do not .. and guess who has a whole lot of TAMRON caps? It's just that the white ones make the aperture blade movement so obvious ... I thought I'd mention you also can get a clear, focused image with some of the longer lenses.
    Last edited by DonSchap; 01-25-2009 at 08:17 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

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