Musings on Photography

Tonal Rendering

Posted in interesting blogs by Paul Butzi on April 24, 2007

There’s an excellent post comparing the tonal rendering of 28mm lenses that can be mounted on an Leica M8 over on Siliceous.

And, if that wasn’t enough, there’s more on Photostream.

Check it out, it’s well worth reading.  I project that tonal rendering of lenses is going to be the next wave of thinking about lens characteristics, in the way that ‘bokeh’ was.

5 Responses

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  1. Ed Richards said, on April 24, 2007 at 10:47 am

    Same link?

    Put on your scientist hat – what will influence tonal rendering by a lens? Is this a MFT measure under a different guise? Do we also need to know the detail frequency of the scene to really compare lenses?

  2. Paul Butzi said, on April 24, 2007 at 11:22 am

    Sorry, link is now fixed.

    I never take the scientist hat off, not even in the shower. I think it’s held on with surgical staples, or something, it doesn’t seem removable.

    The MTF question is interesting. A little testing with targets that are similar but have different amounts of high frequency detail would probably answer that. One more thing on the list of things to do on a rainy afternoon…

  3. Ed Richards said, on April 24, 2007 at 1:40 pm

    Imagine a target of pure black dots on a pure white background, with the dots taking up 50% of the area. This should look pure gray from far away and two spikes from close up. Move it away from the close position and you should get a good curve describing what is going on with micro contrast. Bet it looks like MTF – wonder if there is MTF data for the lenses being compared?

  4. Colin Jago said, on April 25, 2007 at 3:29 pm

    The Leica lenses have mtf charts on the Leica site, but I can’t find one for the Ultron.

    Puts says that the Ultron is pretty close to the Summicron except wide open, but he doesn’t publish the actual data. He also says of the Ultron: “As a design philosphy this lens is a bit tuned to high resolution versus high contrast.”

    His half review is here:

    http://www.imx.nl/photosite/japan/voigt2890.html

  5. Guy Tal said, on April 26, 2007 at 8:47 am

    Not sure why it would be related to MTF or resolution. My first guess is the coating, which is directly related to contrast.

    Guy


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