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Question on AF performance with E-M1 MFT Lens vs 4/3 lens with adapter?

Discussion in 'Olympus Cameras' started by LoneRider, Mar 8, 2014.

  1. LoneRider

    LoneRider Mu-43 Veteran

    250
    Feb 25, 2014
    Marysville, WA.
    Wayne
    So I am looking at the options for a 300mm zoom and have a question.

    Any considerable AF or IQ performance gain to go with the MFT 75-300mm lens compared to the older 4/3 70-300mm lens and the converter?

    The older lens is a little faster and it looks like the adapter and older lens can be had for about $100 less than the new lens.

    Thoughts?
     
  2. mattia

    mattia Mu-43 Hall of Famer

    May 3, 2012
    The Netherlands
    The native will be much smaller and have much better AF performance. I had the Panasonic 100-300, now have the 43 50-200 SWD, which is an excellent lens, and the AF is decent in good light, and acceptable in dim light. Adding the 1.4 teleconverter decreases AF performance slightly. The 100-300 was half the size and weight (and a much slower lens optically, but really quite good optically - not in the same quality range overall though) and has much better AF performance in all lighting conditions. Add the fact the 43 75-300 isn't exactly known for its stellar image quality, and it's a no contest situation. The 50-200 is a different story due to optical quality combined with faster aperture.

    Short version: get the native micro four thirds lens.
     
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  3. dhazeghi

    dhazeghi Mu-43 Hall of Famer

    Aug 6, 2010
    San Jose, CA
    Dara
    The newer lens is both faster to focus and sharper. Even on the E-M1, native CDAF performance is a notch faster than PDAF performance, and it's a lot less finicky about contrast and lower light. The half stop speed disadvantage at the long end isn't as big as it might be, since the 70-300 isn't all that sharp wide open. You also save half a pound in weight with the 75-300. The one thing the 70-300 does do that the 75-300 can't is focus quite close - it'll give you 1:2 magnification which can be handy for long macro shots (vs. ~1:5).
     
    • Like Like x 1
  4. Clint

    Clint Mu-43 All-Pro

    Apr 22, 2013
    San Diego area, CA
    Clint
    I sold my 4/3 75-300 - go with the newer one. A viable option is a used 4/3 55-200 with adapter - but I'm not selling mine!
     
  5. OzRay

    OzRay Mu-43 Legend

    Jan 29, 2010
    South Gippsland, Australia
    Ray, not Oz
    The only m4/3 lenses I have are the 17mm f2.8 and the 14-42mm kit; however, I have a full compliment of top pro lenses, as well as the 18-180mm 4/3 lens. The focus performance with the 4/3 lenses on the E-M1 is as fast as with my previous E-5. The m4/3 lenses are in no way faster. Also, my gut feeling is that the E-M1 focusses faster in low light with the 4/3 lenses than did the E-5. I would have no hesitation in recommending 4/3 lenses with the E-M1.
     
  6. LoneRider

    LoneRider Mu-43 Veteran

    250
    Feb 25, 2014
    Marysville, WA.
    Wayne
    So, $256 for a Zuiko 70-300mm and the MMF2 adapter is going to be very comparable and possibly equal in performance (IQ and AF wise) to the $550 M.Zuiko 75-300mm on an M1?
     
  7. mattia

    mattia Mu-43 Hall of Famer

    May 3, 2012
    The Netherlands
    No. The native will be faster.
     
  8. dhazeghi

    dhazeghi Mu-43 Hall of Famer

    Aug 6, 2010
    San Jose, CA
    Dara
    I don't agree on the IQ. The 70-300 isn't especially sharp at f/5.6. The 75-300 is maximally sharp wide open. You can find it for under $400 secondhand or refurbished.