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  1. #13
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,554

    Lightbulb Really digging deep ... to get to 400mm

    Okay, I went and committed the "ultimate sin" and mounted the CZ 135mm f/1.8 on the Kenko 3x T/C. to produce a 405mm f/5 lens. You know what? It ain't half bad! I just did a couple of preliminaries with it, and I am hopeful and rather impressed with the acceptable sharpness and limited Chromatic Aberration of an indicated aperture of "f/6.3"

    I had not really thought about doing something like this until 'Rooz' and Peter started going back and forth about the "heinous" act of mounting the Minolta AF 200mm f/2.8's APO G HS on a T/C. Oh, believe me that the Zeiss lens' focus speed is nothing to write home about (it is slow as heck), riding on a T/C, but for a quick fix ... it is definitely worth a look.

    I will post some side-by-sides, later ... comparing the:
    1. TAMRON SP AF 200-500mm f/5-6.3 Di LD @ 400mm,
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      .
    2. Tokina AT-X 840 80-400mm f/4.5-5.6 @ 400mm,
      Name:  850+ATX840.jpg
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      .
    3. 3x T/C w/ SONY CZ 135mm f/1.8,
      Name:  850+3x+135.jpg
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      .
      and
    4. 2x T/C w/ Minolta AF 200mm f/2.8 APO G HS
      Name:  850+2x+200.jpg
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    all mounted on the α850

    It would seem to be a "fair fight" ... and just what the doctor ordered.
    Last edited by DonSchap; 09-12-2009 at 10:53 PM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

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