Showcase Canon 100mm F3.5, Black Version, 40mm filter thread

Discussion in 'Leica M and LTM Mount Lens Sample Image Showcase' started by Brian, Oct 6, 2017.

  1. Brian

    Brian Super Moderator Subscribing Member

    Apr 3, 2013
    Two of these were sent to me to use as parts, the owner being told the glass was damaged beyond repair. Basically- got lucky, took the coating off. In this case, we got lucky- one going back to Australia, one staying here.

    Y2 Filter, Walz 40mm hood, wide-open.

    37536951411_18d6d2b298_b. Canon 100 F3.5, 8x by fiftyonepointsix, on Flickr

    Not your Typical Brick test...
    F5.6. Many of Joe Rosenthal's pictures are on display with the flag raised at Iwo Jima.

    36827148284_a05e758079_b. Canon 100 F3.5, 8x by fiftyonepointsix, on Flickr

    36827147914_b3ef472006_b. Canon 100 F3.5, 8x by fiftyonepointsix, on Flickr

    Monument to those that have fallen in Combat.
    F3.5

    36827146684_be926f1ddd_b. Canon 100 F3.5, 8x by fiftyonepointsix, on Flickr
     
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  2. Brian

    Brian Super Moderator Subscribing Member

    Apr 3, 2013
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  3. SParis

    SParis New to Leica Place

    8
    Sep 5, 2017
    Beverly Hills, Michigan
    Scott Paris
    Big "Like" for the pictures.

    How did you take the coating off? I have a black and silver 100mm that's moderately fogged. Nobody's looked at it, but John at focal Point told me that they are subject to permanent damage, he believes from humidity. Guess I need to send it to somebody, just to see if it can be cleaned .... if not, I thought I'd try to remove the coating myself.
     
  4. Brian

    Brian Super Moderator Subscribing Member

    Apr 3, 2013
    On this one- Isopropanol Alcohol was all that was required. I suspect the coating was softened up buy oil. The rear element and element behind the aperture are held in with one retaining ring and a metal spacer between them. I marked the outermost surface with a Sharpie, and edges of the second element with arrows on the side to re-insert with the proper orientation. I've seen Canon elements where the glass itself is etched, and others where cement of groups has discolored. I think the oil outgasses through the linkage for the aperture, deposits on the glass on each side of the aperture blades. The Canon glass that was used for its low-dispersion, high-index of refraction rwacted badly to oil.

    Two more, wide-open, from inside the museum.

    37541957771_331aa7a687_b. Canon 100 F3.5, wide-open by fiftyonepointsix, on Flickr

    37510680802_787c5388a5_b. Canon 100 F3.5, wide-open by fiftyonepointsix, on Flickr

    The 100mm focal length is perfect for isolating the mannequins from the background.
     
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  5. cobbu2

    cobbu2 Leica Place Regular

    42
    Sep 17, 2014
    Rockville, MD
    This is an excellent lens, no need for anything "more expensive," ;) it does the job well!

    31038840293_029ecff573_b.

    Canon 100/3.5 black version, M8
     
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  6. SParis

    SParis New to Leica Place

    8
    Sep 5, 2017
    Beverly Hills, Michigan
    Scott Paris
    Thanks!