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Thread: Lens design: super-sharp center gradually fading out.

  1. #1

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    Lens design: super-sharp center gradually fading out.

    Hi to all, I'm searching for a lens that will produce images that are super sharp in the middle and gradually unsharp toward the edges, like those pictures:

    http://d32dm0rphc51dk.cloudfront.net...Plg/larger.jpg
    https://www.artnews.com/wp-content/u...master1050.jpg
    http://i.pinimg.com/736x/e6/13/85/e6...tographers.jpg

    I read discording opinions about Rapid Rectilinear-type lenses, someone saying that those are bad at the margins and just less bad in the middle. Can you suggest me what to look for?
    Thank you
    Last edited by penauts; 12-Nov-2017 at 18:12. Reason: wrong link

  2. #2
    Corran's Avatar
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    Re: Lens design: super-sharp center gradually fading out.

    Petzval
    Bryan | Blog | YouTube | Instagram | Portfolio
    All comments and thoughtful critique welcome

  3. #3
    Jac@stafford.net's Avatar
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    Re: Lens design: super-sharp center gradually fading out.

    Quote Originally Posted by Corran View Post
    Petzval
    ++1, Petzval

  4. #4

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    Re: Lens design: super-sharp center gradually fading out.

    Wow, that's exactly what I was looking for
    thank you again!

  5. #5

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    Re: Lens design: super-sharp center gradually fading out.

    The examples you show were probably shot with something like a Tessar working on a size far beyond it's design. I suspect a Petzval would be more unsharp away from the center than you wanted. Once a Tessar gets out to the size it's designed to cover, things go bad quickly. Though some articles say Sally Mann worked with old "broken" lenses, this sounds like something a writer, not a photographer, would say. Pictures of her working show a variety of lenses. You might also look at photos shot with a modern Wollaston lens, but like the Petzval, these go much worse much faster than the examples you showed, which really aren't too bad.
    Thanks, but I'd rather just watch:
    Large format: http://flickr.com/michaeldarnton
    Mostly 35mm: http://flickr.com/mdarnton
    You want digital, color, etc?: http://www.flickr.com/photos/stradofear

  6. #6

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    Re: Lens design: super-sharp center gradually fading out.

    Oh ok, that would explain the severe vignetting

  7. #7

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    Re: Lens design: super-sharp center gradually fading out.

    Here's a thread you might find interesting:
    https://groups.google.com/forum/#!to...at/t8a_FUREFZQ

    Also notice my additions to my previous comment....
    Thanks, but I'd rather just watch:
    Large format: http://flickr.com/michaeldarnton
    Mostly 35mm: http://flickr.com/mdarnton
    You want digital, color, etc?: http://www.flickr.com/photos/stradofear

  8. #8
    Corran's Avatar
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    Re: Lens design: super-sharp center gradually fading out.

    The curved plane of focus in the second example is what makes me think Petzval. It could be swing but it seems like the tarp-covered thing behind the girl would be in focus then. Perhaps a slower, more mundane Petzval with a bit more DOF than your super-fast portrait ones that would show much more swirl/aberrations? Just guessing. I always thought SM used Petzvals for a lot of her work but I must admit I am not sure.
    Bryan | Blog | YouTube | Instagram | Portfolio
    All comments and thoughtful critique welcome

  9. #9

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    Re: Lens design: super-sharp center gradually fading out.

    Got the same effect with a Fujinon SF lens without one of its aperture disks. The coverage of these optics are huge (250mm actually covered 11x14 and maybe even more) but sharpness quickly degrades. A Petzval a serious option but at ten times or more the price of a Fujinon SF.

  10. #10

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    Re: Lens design: super-sharp center gradually fading out.

    Surely a Petzval used right out to its edge should be showing quite a bit of swirly, right?
    Thanks, but I'd rather just watch:
    Large format: http://flickr.com/michaeldarnton
    Mostly 35mm: http://flickr.com/mdarnton
    You want digital, color, etc?: http://www.flickr.com/photos/stradofear

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