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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.

    • Like Like x 4
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