Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 73,051   Posts: 1,611,083   Online: 1130
      
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 27
  1. #11
    EASmithV's Avatar
    Join Date
    Aug 2008
    Location
    Maryland
    Shooter
    Multi Format
    Posts
    1,890
    Blog Entries
    4
    Images
    123
    COCK
    www.EASmithV.com

    "The camera is an instrument that teaches people how to see without a camera."— Dorothea Lange
    http://www.flickr.com/easmithv/
    RIP Kodachrome

  2. #12
    Danielle's Avatar
    Join Date
    Jun 2011
    Location
    Melbourne, Australia
    Shooter
    Multi Format
    Posts
    71
    So I presume that an RB Mamiya should be stored cocked too? I stored it for a number of years, and its without a problem I might add. Nobody ever told me to store it cocked, unless its different to a hasselblad in that regard. So I was probably doing the wrong thing?

    I like this site, I pick up little bits of information here and there.

  3. #13
    Steve Smith's Avatar
    Join Date
    May 2006
    Location
    Ryde, Isle of Wight
    Shooter
    Medium Format
    Posts
    8,814
    Images
    122
    Cocked or un-cocked doesn't really matter with any shutter as the spring is in tension in either case. i.e. it is still in tension when un-cocked as the mechanism only uses a small portion of the spring's movement to actuate.

    As most camera systems need the lenses to be cocked for removal and re-mounting, it seems logical to keep them cocked.


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  4. #14
    Frank Chambers's Avatar
    Join Date
    May 2011
    Location
    Berlin, Germany
    Shooter
    Multi Format
    Posts
    16
    Images
    5
    Just a quick excursion to the mentioned Mamiya system. In the instructions for RZ interchangeable lenses, point 6 is written:

    "If a lens is not to be used for a prolonged period, we recommend storing it with the shutter released. To release the shutter of a lens that has been removed from the camera body,..."

    This is indeed for the Mamiya RZ lenses only.

  5. #15
    brucemuir's Avatar
    Join Date
    Dec 2007
    Location
    Metro DC area, USA
    Shooter
    Multi Format
    Posts
    2,264
    Images
    4
    Quote Originally Posted by Frank Chambers View Post
    Just a quick excursion to the mentioned Mamiya system. In the instructions for RZ interchangeable lenses, point 6 is written:

    "If a lens is not to be used for a prolonged period, we recommend storing it with the shutter released. To release the shutter of a lens that has been removed from the camera body,..."

    This is indeed for the Mamiya RZ lenses only.
    Does it hint at what "prolonged" constitutes?

  6. #16
    Frank Chambers's Avatar
    Join Date
    May 2011
    Location
    Berlin, Germany
    Shooter
    Multi Format
    Posts
    16
    Images
    5
    Quote Originally Posted by brucemuir View Post
    Does it hint at what "prolonged" constitutes?
    Nope, no hint is given. I guess it might be more than a month or longer... But I have a 110/2.8 which was stored about 10 years cocked and it works perfect. Its shutter tension is very, very soft compared to uncocked stored lenses but as said, it works perfect.

    And yes, of course it's different to Hasselblad.

  7. #17
    Danielle's Avatar
    Join Date
    Jun 2011
    Location
    Melbourne, Australia
    Shooter
    Multi Format
    Posts
    71
    Thats interesting to know, blad's cocked and mamiya's uncocked. Ha. - If I ever decide to blow money on a blad as well. *shrugs* ... Was contemplating, thats all.

    Its an RB I have. My 'prolonged period' was like 6 years. Stored in a huge lowepro bag with silica gel uncocked with the lens on the body.

  8. #18
    MattKing's Avatar
    Join Date
    Apr 2005
    Location
    Delta, British Columbia, Canada
    Shooter
    Multi Format
    Posts
    13,246
    Images
    60
    Actually .....

    In normal use, the shutters in the Mamiya RB/RZ lenses are intended to be left tensioned between uses, so the suggestion to release the tension for long term storage is interesting, and clearly differentiated from the "norm".
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  9. #19

    Join Date
    Jun 2005
    Shooter
    4x5 Format
    Posts
    523
    I had a similar this discussion with Hasselblad's optical engineer. For reference his initials were E. P. It is not appropriate to supply his name. He was responsible for the glass and mechanical lens parts. He recommended low humidity to avoid growth <35%. The shutter should be stored uncocked since this puts less stress on the main spring. If removed from the camera use a coin to slow down the unwinding of the shutter mechanism. (Hold a coin in the slot then trip the lens by pushing the protected release on the back of the lens.) Store at 1 second since this is also a less stressed position.

    To keep the shutter parts lubricated, activate the lens at least once a year at a variety of speeds. Also, rotate the focusing ring through the range. Storing at a variety of orientations keeps the lubricate from building up in one place.

    To reinstall on the camera body, carefully wind the lens with the coin. Be careful not to let the coin slip.

    The camera leaves the lens cocked in order to provide a user feature. The lenses can standup to this use but it may not be ideal for long term storage.


    It is still best to use it!
    Last edited by laser; 01-01-2012 at 09:48 PM. Click to view previous post history.

  10. #20
    Steve Smith's Avatar
    Join Date
    May 2006
    Location
    Ryde, Isle of Wight
    Shooter
    Medium Format
    Posts
    8,814
    Images
    122
    Quote Originally Posted by Sirius Glass View Post
    Yes, but the Hasselblad lenses are specifically designed to be stored in the cocked position. Mamiya does not use the same design criteria, that is the difference.
    But they both use springs and in either case, a cocked spring probably only has 10% to 20% more tension than an un-cocked spring.



    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

Page 2 of 3 FirstFirst 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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