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LensRentals: Even the best lens adapters could be better

Discussion in 'Adapted Lenses' started by MarylandUSA, Oct 4, 2013.

  1. MarylandUSA

    MarylandUSA Mu-43 Regular

    185
    Jul 3, 2013
    Poolesville, Maryland
    Paul Franklin Stregevsky
    After bench-testing many premium lens adapters, LensRentals.com's Roger Cicala advises users to think twice before adapting a wide-angle lens. Blog post here.
     
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  2. RnR

    RnR Mu-43 All-Pro

    Sep 25, 2011
    Brisbane, Australia
    Hasse
    Edit - ignore me - helps to read the article... sheesh...
     
  3. Petrochemist

    Petrochemist Mu-43 Top Veteran

    652
    Mar 21, 2013
    N Essex, UK
    Mike
    The evidence he's presenting is quite useless.

    He says ' While the graph makes it look like the MTF drops to zero, that’s simply because the settings we’re using report zero if focusing distance changes greatly or vignetting become severe. That makes a nice warning signal for ‘some human needs to come check this lens’.' then presents graphs with the MTF dropping to zero to show how bad they are. If your doing lab tests you need to present the actual data not some arbitrary flag settings.

    In the last section he states his testing probably has no significant effect in the real world. Having used some very cheap adapters I'd agree with that!
     
  4. RnR

    RnR Mu-43 All-Pro

    Sep 25, 2011
    Brisbane, Australia
    Hasse
    From the comments, the tests are done wide open. A few stop down and the results would be far less than observed. Also it seems that their testing methodology is not quite right as yet, with possibly light contamination playing a factor.
     
  5. edmsnap

    edmsnap Mu-43 Veteran

    430
    Dec 20, 2011
    Edmonton, Alberta
    Soooooo... the company that wants to rent people native lenses for 5-day stretches advises people not to use around the same amount of money to buy vintage lenses that they can keep and use forever. Nothing suspicious there at all.
     
  6. RevBob

    RevBob Super Moderator

    Jun 4, 2011
    NorthWestern PA
    Bob
    For the average person this has little meaning or impact (which he states.) For a landscape photog making large prints it would probably cause problems. Then again, that person would probably be using high quality native lenses.
     
  7. dhazeghi

    dhazeghi Mu-43 Hall of Famer

    Aug 6, 2010
    San Jose, CA
    Dara
    Generally yes, but for m4/3 some of the highest quality WA options are 4/3 lenses - the Olympus 7-14/4, 12-60/2.8-4.0 and 14-35/2. The group of people using these isn't very large, but it does exist.