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Thread: 35mm and digital infrared

  1. #81
    Tin Can's Avatar
    Join Date
    Dec 2011
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    12,307

    Re: 35mm and digital infrared

    I cannot find the D70, it's here somewhere. I will try with my D7000

    Ken Rockwell says fake it in PS. He also explains Infrared Film capture well.

    Infra-Red Infrared Photography

    Quote Originally Posted by malexand View Post
    The D70 is pretty easy to convert and you can find them used CHEAP - I did one earlier this spring. The great advantage of doing it internally is you can view through the lens normally. I replaced the internal IR cut-off filter with a Lee polyester 87 filter in about an hour if you include the 2 re-dos I had to do in order to get the ribbon cables seated properly....
    My example from the Smoky Mountains this summer. F8, 1/500
    Attachment 195291
    sin eater

  2. #82

    Join Date
    Dec 2010
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    Baltimore, Maryland, US
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    209

    Re: 35mm and digital infrared

    Don't you need to replace the IR blocking cover glass with something that has the same refractive index? Otherwise how can you make infinity, if your effective focal length is 2-4mm shorter?

  3. #83
    Bill
    Join Date
    Oct 2017
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    Houston, TX
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    16

    Re: 35mm and digital infrared

    Infrared #1 by Bill, on Flickr

    Olympus EPL-1 Micro 4/3, 950nm

  4. #84

    Join Date
    May 2009
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    Vermont
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    174

    Re: 35mm and digital infrared

    A couple from my Leica M8 with a 25mm Canon one with 35 Summilux r72 filter
    Click image for larger version. 

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    Click image for larger version. 

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  5. #85

    Join Date
    Aug 2016
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    Scottsdale, AZ
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    112

    Re: 35mm and digital infrared

    Quote Originally Posted by Will Frostmill View Post
    Don't you need to replace the IR blocking cover glass with something that has the same refractive index? Otherwise how can you make infinity, if your effective focal length is 2-4mm shorter?
    As is often the case, the answer to your question is "it depends."

    For example, when I converted my Samsung NX500 by removing the cover glass / hot filter / dust shaker mechanism, I knew I was only ever going to use adapted, manual-focus lenses with it, so it wasn't necessary for me to insure the camera could still autofocus NX-mount lenses, only that it could reach infinity focus with my adapted lenses.

    Fortunately, the adjustment range built into the sensor mounting bracket is sufficiently large that I was able to tweak its position after I removed the cover glass, et al such that my lenses will indeed focus at infinity without replacing it.

    Whether this method will also work with other camera / lens combos depends upon the other cameras and lenses.
    JG

    More of my photos can be seen at my photo-blog here: https://audiidudii.aminus3.com/

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