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  • .mf

    veterán

    válasz ROBOTER #22856 üzenetére

    Mi lenne, ha tovább is olvasnád, mielőtt kikiáltanád hülyeségnek?

    The thing that gets in the way of all wide converter production, whether my little shop or bigger houses like Kenko, Tamron, Sigma, or Tokina, or even Nikon or Canon trying their hand, is that annoying Kodak patent.
    To this date, only two people have gotten around this:
    •Olympus built the wide converters permanently into the backs of lenses. Their 35-100mm f2.0 and 14-35mm f2.0 are perfectly ordinary 70-200mm f2.8 and 28-70mm f2.8 designs, with integrated 0.5x wide converters.
    •The Nikon/Fuji joint effort called the E2 had a wide converter permanently mounted in the camera.
    The big problem with both of these is fast lenses. The Nikon/Fuji had an optical path wide enough for an f2.8 output, which meant that it limited any lens faster than f5.6 to f5.6 when used with the E2. The Oly converters have f2.0 outputs, so lenses that should have ended up f1.4 zooms after 0.5x conversion instead are choked back to f2.
    My fastest 1.5x also had an f2.0 output, so if you put it on an 85mm f1.4, you got a 56mm f2.0, with nowhere near the quality of an old CZJ or Jupiter in that range.

    Ott a többi link is, nekem eléggé úgy tűnt, hogy ez az ember hivatásosan is evvel foglalkozott, lencséket tervezett és van köze a témához...

    Az egész díszpéldája annak, hogy... ;]

    Fotóim és kalandjaim a világ körül: https://www.facebook.com/fmartinphoto/

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