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Using Big Glass 22.5~90/1.5

Discussion in 'Adapted Lenses' started by Crdome, Apr 23, 2012.

  1. Crdome

    Crdome Mu-43 Hall of Famer Subscribing Member

    Sep 11, 2011
    West Central Indiana
    Chrome
    Analyzing an F/1.5 22.5~90mm lens

    The Cosmicar F/1.5 22.5~90mm super-16 television is a wonderful lens which is fabulous in low light situations. It is however a behemoth telephoto requiring an 82mm filter.

    Though I use a rubber hood the massive glass is subject to extreme flare at times Billowing Vapors - Mu-43 Gallery. In the attached photo slight flares are apparent. I've tried a number of hood designs and only yesterday did I arrived at a $4.49 solution. A thin PVC drainage pipe reducer fits snugly inside rubber hood extending its length from a 1.5" to 4" and increases its diameter to 100mm. Though unfielded this will certainly remedy all flare conditions I've experienced so far.

    As expected from a c-mount lens, the Cosmicar at 22.5mm vignetting on the sides using the 4:3 perspective, but surprisingly only about 60% at top and bottom. At 32mm the image circle reaches the image's sides, and at 45mm the image is respectable. About 65mm it relegated to the corners and from 75-90mm only a hint of vignetting exist.

    Cosmicar_f1_5:22_5_90mm.
    DMC-FZ8    ---    10mm    f/2.8    1/8s    ISO 200


    Green_Barrel277_9_116_228_web.
    DMC-GH2    ---    0mm    f/1.0    1/13s    ISO 160
     
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  2. Crdome

    Crdome Mu-43 Hall of Famer Subscribing Member

    Sep 11, 2011
    West Central Indiana
    Chrome
    A sample without flare.

    Distribution_820_92_255_web.
    DMC-GH2    ---    0mm    f/1.0    1/20s    ISO 160
     
    • Like Like x 1
  3. gnarlydog australia

    gnarlydog australia Mu-43 Hall of Famer Subscribing Member

    Feb 23, 2015
    Brisbane, Australia
    Damiano Visocnik
    not a small lens but that f1.5 is very intriguing...
    can't find many samaples on Flickr but I would be interested in seeing the bokeh and how it renders close-up subjects
     
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