1. Welcome to Mu-43.com—a friendly Micro 4/3 camera & photography discussion forum!

    If you are thinking of buying a camera or need help with your photos, you will find our forum members full of advice! Click here to join for free!

Showcase Tamron 35-100mm f/3.5~4.3 OM mount

Discussion in 'Adapted Lens Sample Image Showcase' started by mauve, Jul 4, 2011.

 
 
  1. mauve

    mauve Mu-43 All-Pro

    Mar 9, 2010
    Paris, France
    <table style="width:auto;"><tr><td><a href="https://picasaweb.google.com/lh/photo/ckg9nYS1jkPHzdmk4WllFw?feat=embedwebsite">https://lh5.googleusercontent.com/-g66q6jkyl64/ThJzZbEtHjI/AAAAAAAACfU/JFA-bqwgD7M/s800/_V054670.JPG" height="600" width="800" /></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:11px; text-align:right">De <a href="https://picasaweb.google.com/manuel.viet0/Test?authuser=0&feat=embedwebsite">test</a></td></tr></table>

    This zoom has a macro setting (built in extension tube on an helicoid) able to achieve 1:4 (25%) reproduction ratio.

    This picture is a quick sample of the macro setting, handheld under a desk lamp. Full OOC jpg provided for your viewing pleasure.

    I'm not a scientist (and especially not really keen on mathematics & optics), but this quick test seems to show the 1:4 reproduction ratio is kept on :43: sensor. The width of the watch (real life) is ~35mm, the width of the sensor is 17.3mm, and a non-scientific rule of third between measurements of, respectively, the size of the frame and the diameter of the watch, estimated with a ruler on the screen, gives a projected image of 8.25mm on the sensor for the watch. 35->8.25 is close enough to 1:4 reduction for my taste.


    This kind of zoom was popular in the late 70s' - early 80s' and they were sold under many different brand names (soligor, tamron, etc.) Quality may vary, mine has always been good in the film days.

    Cheers,
     
    • Like Like x 4
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.