Site Sponsors
Results 1 to 9 of 9

Thread: ALPA (not Alpha) lenses on the A7

  1. #1
    Senior Member f/otographer's Avatar
    Join Date
    Jul 2012
    Posts
    281
    Post Thanks / Like

    ALPA (not Alpha) lenses on the A7

    Does anyone have experience using Alpa bayonet lenses on the A7? Some wonderful and very esoteric lenses were made for this system back in the day. It has peaked my interest due to the fairly short flange to focal distance of the Alpa mount. At only 37.8mm the FTF is shorter then the shortest Japanese SLR system which is Konica at 40.5mm. A shorter adapter will help the overall A7 package stay nice and small.

    My concern is that the mount registration distance is getting so short that it is very close to some of the longer rangefinder distances where we know all kinds of corner and smearing issues can show up. For instance, the Contax RF register is 34.5mm.

    Im wondering though if the lens designs for the Alpa system were more SLR like then Rangefinder like so this might help prevent bad corners and such.

    And advice would be appreciated.

  2. #2
    Super Duper
    Senior Member

    Join Date
    May 2008
    Location
    Manchester/Jerusalem
    Posts
    2,652
    Post Thanks / Like
    Images
    290

    Re: ALPA (not Alpha) lenses on the A7

    Can you tell me about their lenses? I've only ever heard of them as a name.
    I am not a painter, nor an artist. Therefore I can see straight, and that may be my undoing. - Alfred Stieglitz

    Website: http://www.timelessjewishart.com

  3. #3
    Senior Member f/otographer's Avatar
    Join Date
    Jul 2012
    Posts
    281
    Post Thanks / Like

    Re: ALPA (not Alpha) lenses on the A7

    Im not familiar with much of the line Ben. I know that the Kern Macro Switar is supposed to be the best 50mm lens ever, beating out even the Summilux. All that is subjective of course and up to an individuals tastes. Examples I have seen from the lens online look very nice.

    Alpa made some of their own lenses but many famous makers also supplied glass. Angenieux and Schnieder to name just a couple. Prices for many of the lenses are now in the 'esoteric' bracket. How they actually perform in real life I would like to see for myself.

  4. #4
    Super Duper
    Senior Member

    Join Date
    May 2008
    Location
    Manchester/Jerusalem
    Posts
    2,652
    Post Thanks / Like
    Images
    290

    Re: ALPA (not Alpha) lenses on the A7

    The prices are certainly 'exotic'!
    I am not a painter, nor an artist. Therefore I can see straight, and that may be my undoing. - Alfred Stieglitz

    Website: http://www.timelessjewishart.com

  5. #5
    Member
    Join Date
    Jun 2009
    Posts
    49
    Post Thanks / Like

    Re: ALPA (not Alpha) lenses on the A7

    Quote Originally Posted by f/otographer View Post
    My concern is that the mount registration distance is getting so short that it is very close to some of the longer rangefinder distances where we know all kinds of corner and smearing issues can show up. For instance, the Contax RF register is 34.5mm.
    FWIW, the smearing issues are related to the exit pupil distance. Exit pupil distance is unrelated to mount registration distance or to the BFL.

  6. #6
    Super Duper
    Senior Member
    Michiel Schierbeek's Avatar
    Join Date
    Mar 2009
    Location
    Amsterdam/Normandy
    Posts
    4,058
    Post Thanks / Like
    Images
    762

    Re: ALPA (not Alpha) lenses on the A7

    I think Klaus and Hakkalo are your men.
    You can ask Klaus in the M4/3 bokeh thread where he posts almost dayly.

  7. #7
    Senior Member f/otographer's Avatar
    Join Date
    Jul 2012
    Posts
    281
    Post Thanks / Like

    Re: ALPA (not Alpha) lenses on the A7

    Quote Originally Posted by brianc1959 View Post
    FWIW, the smearing issues are related to the exit pupil distance. Exit pupil distance is unrelated to mount registration distance or to the BFL.
    You are, of course, entirely right Brian. I had learned this some time back and completely forgotten about it. My bad.

  8. #8
    Senior Member f/otographer's Avatar
    Join Date
    Jul 2012
    Posts
    281
    Post Thanks / Like

    Re: ALPA (not Alpha) lenses on the A7

    Quote Originally Posted by Michiel Schierbeek View Post
    I think Klaus and Hakkalo are your men.
    You can ask Klaus in the M4/3 bokeh thread where he posts almost dayly.
    Thanks for the head up Michiel. But I have just decided to stay with my ML glass instead of diving into such deep waters as Alpa and such. The lenses are just more then I want to spend. There are to many other great lenses that are much more budget friendly.

    But the Kern Marcro Switar......mmmmm

  9. #9
    New Member
    Join Date
    Dec 2011
    Posts
    6
    Post Thanks / Like

    Re: ALPA (not Alpha) lenses on the A7

    I have a GXR with the M module and use my kern macro switar 50mm f 1.9 on it. I forgot what a nice lens it is. This coming weekend I am going to do a shoot out with a friend that has the new 50mm Apo. Summicron. We know that his lens has more contrast then my Switar, but my lens was made back in 1967 so there is going to be some difference just in the coatings plus whatever type of glass Leica is using. Most don't know that Leica purchased Kern back around the mid 1980's to get their binocular contracts with the Swiss military, and when we compared the lens diagrams of both lenses they are close. So did Leica use the old Kern design as a starting point, who knows.
    wbill
    Last edited by agfa100; 8th April 2014 at 15:54.
    Likes 1 Member(s) liked this post

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •