Infra Red with DSLRs

Discussion in 'Digital SLR' started by Craig Marston, May 17, 2005.

  1. Has anyone played about with infra red with their DSLR?

    I used a Fuji S3 Pro and a Cokin 89B filter to produce these images:

    http://www.bipp.com/en/dyn/toonfoto.shtml?RSES=20054817215594798&4_25=10368
    http://www.bipp.com/en/dyn/toonfoto.shtml?RSES=20054817215598099&4_25=10369

    Please let me know what you think. I've never tried IR film (can I use that
    word here?!) so I don't know what to compare against. The effects is better
    than I expected though I must admit! <g>

    Cheers all,
    Best regards,
    Craig.

    p.s. it was a very windy day and the exposures were 20 seconds...
     
    Craig Marston, May 17, 2005
    #1
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  2. I think a lot of us have.
    They're nice, in particular the last one.
    I've used IR film, and IR digital is a lot simpler. Just to be able
    to use the review and histogram to tune exposure simplyfies things
    a lot.

    I mainatin an difital IR resource page with exposure data for various
    digital cameras: http://folk.uio.no/gisle/photo/ir.html .

    I would appreciate to have the full exposure data (ISO, aperture and
    shutter) for your Fuji S3.
     
    Gisle Hannemyr, May 17, 2005
    #2
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  3. Craig Marston

    Alan Browne Guest

    Certainly have that "IR" look.
     
    Alan Browne, May 17, 2005
    #3
  4. Cheers mate! Everyone likes that one best, but I prefer the one with just
    the trees...
    Hell yes! I never had to consider the handling precautions either.
    Now that is one fantastic resource - I wish I'd know of it earlier!
    You certainly can mate, I have emailed the two EXIF JPEGs extracted from the
    RAW files to you.

    Rgds
    Craig.
     
    Craig Marston, May 17, 2005
    #4
  5. I did have to perform quite a bit of buggering about in Photoshop though..!
    At capture the histogram looks like a monolith rather than a nice hill, and
    the chromatic spread is tiny too. I can adjust this easily with the
    HyperUtility software though before converting it to B+W in Photoshop via
    the channel mixer. The infra red parts of the image tend to be light blue...

    Craig.
     
    Craig Marston, May 17, 2005
    #5
  6. I've done a bit with my S2 and a 72R filter -- but I don't seem to
    have the better set on the web. I found that picking *one* channel
    and exposing for it (so I chose red, of course) worked better. And I
    needed to use a tripod more than I did (the S2 is considerably less
    sensitive than the previous camera I did digital IR with).
     
    David Dyer-Bennet, May 18, 2005
    #6
  7. Craig Marston

    RichA Guest

    Excellent shots. I've always loved the look of IR shots, black and
    white that is. You find out some interesting things doing it, for
    instance, some black objects turn almost white due to having high
    IR reflectivity while others stay dead black. Now, if only good IR
    filters weren't so pricey, except for wratten.
    -Rich
     
    RichA, May 18, 2005
    #7
  8. Excellent shots. I've always loved the look of IR shots, black and
    Thanks for the kind comments.

    The filter I have, I ordered from Jessops online as they are like hens'
    teeth to get hold of! Have you seen Gisle's web page on this subject, it's
    very good. I shall have to investigate the effect you mentioned as that
    could make for some awesome shots! This is the filter that I bought:
    Item: 1.COKA007 - A SERIES INFRARED 89B (A007)

    Availability: Usually available in 2-4 weeks* Quantity Ordered: 1 Unit
    Price: 17.99 GBP Line Total: 17.99 GBP
     
    Craig Marston, May 18, 2005
    #8
  9. I've done a bit with my S2 and a 72R filter -- but I don't seem to
    It would seem that higher-end cameras have more IR filtration (high-pass)
    over their sensors, hence the long exposures as the two filters are kind of
    fighting each other! I've seen some stunning images taken with compact
    cameras because they don't have the same level of IR filtration built in.

    What do you mean by "picking one channel and exposing for it"?

    Cheers,

    Craig.
     
    Craig Marston, May 18, 2005
    #9
  10. Craig Marston

    RM Guest

    Re: filters fighting each other...

    There's a site that describes modifying DLSR's (D70 specifically) by
    removing the IR blocking filter in front of the sensor, and replacing it
    with an opaque IR pass filter (obtainable from Edmond Scientific, but
    has to be cut down to size). Then you've got an IR camera, no external
    filter required, that yields exposure times fast enough to go without a
    tripod! I've been waiting for D70's to become cheap enough on the used
    market to pick one up and give this a try...

    Here's the link:

    http://www.lifepixel.com/IR.htm

    Cheers,

    RM
     
    RM, May 19, 2005
    #10
  11. Craig Marston

    RichA Guest

    If you don't want to destroy the camera for other types of
    photography, you can replace the hot mirror filter with a clear
    anti-reflection filter, then use either infrared filters or
    hot mirror filters (for regular shots) on the front of your lens.
    I believe B&W stocks IR blocking screw-on filters. Another thing
    the article didn't mention was that IR has a different focus point
    than white light and I don't know if a P&S will focus on it correctly
    if all other light frequencies are blocked off.
    -Rich
     
    RichA, May 19, 2005
    #11
  12. I found the histograms in red, green, and blue were placed
    considerably differently. So to get "ideal" placement I had to pick
    just one (and then use only that channel in my image). Given Bayer
    filtering, that may be a losing proposition in other ways, though. I
    need to try photographing the same scene that way, and setting
    exposure based on the composite histogram and using all three channels
    in my B&W conversion, and see if there are differences in sharpness or
    resolution. Plus overall appearance of course.
     
    David Dyer-Bennet, May 20, 2005
    #12
  13. A P&S that does its autofocus off the CCD sensor will autofocus
    correctly for infrared with an IR filter. For a DSLR, it depends
    whether the separate autofocus sensor is sensitive to the IR, can work
    in that low a light level, and probably other things.
     
    David Dyer-Bennet, May 20, 2005
    #13
  14. That depends. The Oly C2020Z, which has a sensor that is fairly
    sensitive to IR, autofocuses fine with a R72. The Canon G5, which
    is about five stops less sensitive, don't. Too dark for AF in the
    G5 too find anything to lock on, I guess.
    My experience is that if the built-in AF in a DSLRs work at all - it
    back-focuses. Using manual focus and short focusing by the amount
    indicated on the lens barrel is necessary to get an in-focus picture.
     
    Gisle Hannemyr, May 20, 2005
    #14
  15. I found the histograms in red, green, and blue were placed
    Aah, I see!
    Well, I shoot in RAW and for the IR images I adjusted the curves [in the RAW
    processing s/ware] quite severely. I pulled the middle of the red curve
    quite low and pushed the middle of the blue curve quite high. It appears
    that the IR wavelengths affect the blue sensors the most. When in Photoshop
    I added a channel mixer layer and changed the output to green before ticking
    the monochrome option. I can then alter the red an blue components to
    increase the contrast; the blue being the reflected IR.

    I tried converting to Lab colour mode but I found it like riding a bike
    backwards!

    Regards,

    Craig.
     
    Craig Marston, May 21, 2005
    #15
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