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GM1 or GM5 with Olympus 25mm 1.8 (size question)

Discussion in 'Panasonic Cameras' started by yves75, Nov 9, 2015.

  1. yves75

    yves75 Mu-43 Regular

    49
    Oct 4, 2014
    paris, france
    A bit of a peculiar question ...

    Could somebody having the GM1 or GM5 and the Olympus 25mm f1.8 tell me whether the lens "protrude" a bit at the bottom of the camera when mounted, or not at all ?

    That is, if you place the camera with the lens on a flat surface, does the lens raise the camera a bit (even if 1mm).

    Asking this question as I plan to use the gm5 for digiscoping, but with the adapater I am using (digidapter), the camera has to sit flat on a plate, and if the lens goes below the camera, the adaptater isn't usable (would have to use some kind of plate to raise the camera), not possible with the 20mm for instance.

    And I ordered the new panasonic 25mm f1.7, but looking at the specs, it might also be too big (in diameter), but the Oly might work.
    So if somebody has the GM1/5 with the Oly, would be glad to have the info!
     
    Last edited: Nov 9, 2015
  2. MarkRyan

    MarkRyan Instagram: @MRSallee

    772
    May 3, 2013
    California
    A friend has the GM1 and the Oly 25 definitely fits better than the 20mm. I used Camerasize to get a feel for your question, and I'm not sure honestly.

    http://camerasize.com/compact/#570.411,491.30,ha,t

    The mount rim on both cameras reaches the far bottom edge of the body. From the top-down view, it looks like the diameter of the 25mm protrudes about 2mm past the mount's rim. Though this is a different angle, we're talking circles so it should be the same either direction.

    Here it is compared to the 14mm, which I know sits flush on my friend's camera.

    http://camerasize.com/compact/#491.5,570.411,ha,t
     
  3. Turbofrog

    Turbofrog Mu-43 Hall of Famer

    Mar 21, 2014
    Based on that, it seems like the O25mm won't quiiiite fit perfectly. If you look at all the lenses that Panasonic has made specifically for the GM-series of cameras (12-32, 35-100, 15/1.7) they are all exactly flush with the mount, which they have to be, since the mount is basically tangent to the bottom of the camera.

    pana_gm1_f005_zps85568e8d.

    http://camerasize.com/compact/#570.411,491.5,491.415,491.397,491.485,ha,t

    But again, we're all just speculating. I'm sure there's someone who has a GM1 and the Oly 25.
     
  4. Benzy

    Benzy Mu-43 Regular

    156
    Mar 18, 2014
    Do a google image search for "gm1 Olympus 25mm". The 25 diameter seems to be a tad less than the mount, so it should sit near flush.
     
  5. wjiang

    wjiang Mu-43 Hall of Famer

    Try the matching simulation at the four thirds website. Judging from that it might stick out a little.
     
  6. Alan Yuen

    Alan Yuen Mu-43 Rookie

    15
    Nov 9, 2015
    The GM1 does not lie flat with the 25mm attached....

    20151109-_B090474.
     
    • Informative Informative x 1
  7. yves75

    yves75 Mu-43 Regular

    49
    Oct 4, 2014
    paris, france
    Thanks a lot for the info, didn't see the link to add lenses on camera size up to this point, now I did.
    Also tried the matching simulation at micro four third org, and indeed it looks like the Oly 25 might stick like 1 millimeter or a bit more.

    This should be manageable with an ad hoc plastic "plate", with just a hole in it to pass the tripod screw mount through, or maybe even sanding the barrel just a tiny bit at the bottom.

    But the new panasonic 25mm for sure will not work, will have to return it (didn't received it yet, neither the second hand GM5)

    Need to find an Oly 25 now ..
     
  8. yves75

    yves75 Mu-43 Regular

    49
    Oct 4, 2014
    paris, france
    Ah, thanks for the pic ! :)

    Yes, really by not much, around 1mm it looks, so I will either sand this "outer ring" on the lens just a tiny bit at the bottom, or add a made up plastic plate below the camera with just a hole in it.
     
    Last edited: Nov 9, 2015
  9. Alan Yuen

    Alan Yuen Mu-43 Rookie

    15
    Nov 9, 2015
    You might not want to sand it down, its maybe 1-2mm which doesnt sound like a lot but its all the plastic above the silver mount if you can see in the pictures.

    20151109-_B090479. 20151109-_B090480.
     
  10. yves75

    yves75 Mu-43 Regular

    49
    Oct 4, 2014
    paris, france
    yes, sanding it enough might be a bit too much, I guess I'll have to sand it just a bit and use a plastic piece below the camera.
    By the way, looking at your pics, the tripod mount isn't centered on the gm5 ?

    That could be another issue ..
     
  11. Alan Yuen

    Alan Yuen Mu-43 Rookie

    15
    Nov 9, 2015
    I have it on the GM1, the tripod socket is not in the centre.

    1395626436_sm.bottom.600.
     
  12. yves75

    yves75 Mu-43 Regular

    49
    Oct 4, 2014
    paris, france
    But it is in the center of the lens it seems ?
    (the important point for my usage)
     
  13. Alan Yuen

    Alan Yuen Mu-43 Rookie

    15
    Nov 9, 2015
    yes, its located in the centre directly behind the lens mount
     
  14. tkbslc

    tkbslc Mu-43 Hall of Famer

    There is a Panasonic made grip for the GM1 that also adds a few mm onto the bottom so that you can solve issues with slightly wider lenses.

    It adds just enough so that the GM1 can sit flat with the 20mm, and the 25mm is narrower:
    sc002.


    Edit: Although it blocks the tripod socket, so it probably won't work anyway. Sorry.
     
  15. yves75

    yves75 Mu-43 Regular

    49
    Oct 4, 2014
    paris, france
    Yes, the tripod socket must remain usable, I think there are some kind of extension plates, that will use the socket on the camera, but also have a socket on their basis, read something about that related to the GM1/5, but forgot how it is called.
    (but for my case a 1mm thick or so plastic plate with a hole in it should do the trick, there should be enough screw length left to use the socket on the camera.
     
  16. barry13

    barry13 Super Moderator; Photon Wrangler

    Mar 7, 2014
    Southern California
    Barry
    Hi, most of those will change the location of the socket.

    Barry