Jupter 9

Discussion in 'Adapted Lenses' started by Robin, Jun 19, 2015.

  1. Robin

    Robin Leica Place Regular Subscribing Member

    43
    Jun 8, 2015
    Through the years I've been given to understand that this lens is "beyond redemption" on western rangefinders. Is this a true thing? Mine is a silver '59 version. It only needs a missing screw on the focus ring. Would a CLA help?














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  2. Brian

    Brian Super Moderator Subscribing Member

    Apr 3, 2013
    Try it on your camera at close-focus and wide-open.

    It's not beyond redemption as far as calibrating it for the Leica/Western standard. But, it is not easy. If adjusting the main shim does not get it close enough, the rear optics need to be moved in closer to the aperture to reduce the focal length. It's easier on the later J-9 as it uses a secondary shim. Usually, removing that shim to change the focal length and then adjusting the main shim does the trick. With the earlier J-9: you need to file down the fixture of the rear module.

    8294327754_fd4b6d0217_o. Jupiter-9, wide-open by fiftyonepointsix, on Flickr

    8294327812_fdde1457a7_o. Jupiter-9, wide-open by fiftyonepointsix, on Flickr

    Wide-open and close-up, J-9.
     
  3. Brian

    Brian Super Moderator Subscribing Member

    Apr 3, 2013
    I bought an LTM J-9 off Ebay for the mount, the glass was damaged.

    This is a late Black J-9 barrel with KMZ glass transplanted to it. The late barrels have a secondary shim, meaning it is easier to reduce focal length by bringing the rear in closer to the front group. This corrects some of the error for using a J-9 on a Leica. The main shim is removed to offset the increased distance after moving the rear triplet away from the image plane. Think of it as a Zoom lens with about 1mm of movement. Focus is good from 1.5m to 20m wide-open, at 1.15m- need some manual compensation to correct for back-focus. Not hard, compensate ~2cm at 1.15m.

    Wide-Open,

    25049788930_6aef79fc82_b. February Morning Walk by fiftyonepointsix, on Flickr

    At F4:

    25252298791_4a435d79a9_b. February Morning Walk by fiftyonepointsix, on Flickr

    Wide-Open,

    24714769994_aafde5beb0_b. February Morning Walk by fiftyonepointsix, on Flickr

    Wide-Open and at 1.15m, again- focus and move camera back about a "nose".

    25252289551_7a962dbd42_b. February Morning Walk by fiftyonepointsix, on Flickr

    Infinity at F2,

    24714774154_4bd503a7c6_b. February Morning Walk by fiftyonepointsix, on Flickr

    F4 looks better for infinity- focus shift and DOF in your favor.
     
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