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Adapted lens - Canon FDn 200mm f2.8 on G1

Discussion in 'Micro Four Thirds Forum' started by BillN, Feb 19, 2012.

  1. BillN

    BillN SC Hall of Famer

    Aug 25, 2010
    S W France
    Bill
    Does anyone use this "adapted" lens

    I have never been able to get anything in focus - shots appear to be in focus in the EVR but turn out badly - OOF and soft

    Looking thru the G1 EVR - at Infinity, (on the lens barrel), is a blur and just before infinity seems to be infinity, (i.e. in focus on the EVR)

    here are 4 shots that I took today trying to find focus points - taken at f8 (or maybe one at f2.8) - with high very shutter speeds, (so no shake) - and ISO100 or ISO200

    to me they all look terrible, (maybe the building is semi OK - on second thoughts, no it's not OK)


    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
     
  2. grebeman

    grebeman Old Codgers Group

    Jul 13, 2010
    South Brent, south Devon (UK)
    Barrie
    Bill, it's the age old trouble of an adapter that doesn't hold the lens in quite the right place. Is there any way of adjusting it to move the lens mount on the adapter slightly further away from the camera sensor, it will probably only be three or four thousanths of an inch, excuse the imperial measure. I don't know with bayonet adapters, but I have some for Leica screw lenses where I have shimmed the threaded collar, which is separate from the bayonet part that mounts onto the camera, with three or four thicknesses of silver cooking foil. If that is possible it needs a little experimentation to get it right.

    Barrie
     
    • Like Like x 1
  3. ajramirez

    ajramirez SC All-Pro

    Jul 9, 2010
    Caguas, Puerto Rico
    Antonio
    I own several FD and nFD lenses which I have used very sporadically with m4/3 via adapter. I have found that with some (for example, 100mm 2.8 FD) there is some play in the mount. This could cause the lens to switch position after you have focused it, with the resulting loss of sharpness. I think Barrie's advice is right on the money and may be the solution.

    Cheers,

    Antonio
     
    • Like Like x 1
  4. BillN

    BillN SC Hall of Famer

    Aug 25, 2010
    S W France
    Bill
    Thanks Barrie

    I'll give it a go, but the following was taken with the same adapter and the Canon FDn 50mm f1.4

    [​IMG]
     
    • Like Like x 1
  5. grebeman

    grebeman Old Codgers Group

    Jul 13, 2010
    South Brent, south Devon (UK)
    Barrie
    Go carefully Bill, if you think that the adapter performs ok with another lens, then Antonio's experience with play in the mount on the actual lens might be the problem. Worth looking closely at the mount on your 200mm lens and how it attaches to the lens body. Another way if it's possible is to remove the actual mount flange from the lens and re-attach that with thin shims behind it, which the camera manufacturer might well have done when the lens was built to fine tune it's focus point. That would achieve the same effect, but would throw the lens out when mounted on a Canon camera, in other words it would be adjusted solely to suit your G1 and that adapter.

    Barrie
     
  6. BillN

    BillN SC Hall of Famer

    Aug 25, 2010
    S W France
    Bill
    Barrie - posted the query on the M43 site - another guy has the same problem with the 200mm f4