Results 1 to 5 of 5

polarizers vs ND filters for near IR

This is a discussion on polarizers vs ND filters for near IR within the General photography forums, part of the Photography & Fine art photography category; Hi, My dsc f717 shoots near IR. This camera was seriously crippled (by Sony) when shooting IR, because of concerns ...

  1. #1
    Shinnen's Avatar
    Shinnen is offline Member
    Join Date
    Sep 2015
    Location
    Markham, Ontario
    Posts
    52
    My Photos
    Please do NOT edit my photos
    Critiques
    Critique my photos anywhere in the forum

    Default polarizers vs ND filters for near IR

    Hi,
    My dsc f717 shoots near IR. This camera was seriously crippled (by Sony) when shooting IR, because of concerns that IR will see though some clothing. They restricted the shutter speed to no more than 1/60th of a second, and the aperture stays wide open. I'm not sure how this prevents it from seeing through fabrics, but that's not what concerns me. What concerns me is that, as a result of these restrictions, it is impossible to shoot IR outside during daylight, without filters. So, in order to capture IR during the day I have been using a combination of two polarizing filters, aligned so as to restrict as much visible light as possible. This produces images which, if what I read is correct, bare the hallmarks of true near IR, namely .... black and white images with very dark skies, bright white vegetation, and dark water. The question I have is ..... what am I doing here?
    Thanks,
    ..... john

  2. #2
    Barefoot's Avatar
    Barefoot is offline Senior Member
    Join Date
    Jan 2009
    Location
    Aiken, SC
    Posts
    2,266
    My Photos
    Please do NOT edit my photos
    Critiques
    Critique my photos anywhere in the forum

    Default

    I wonder if you might have considered a Red Filter for IR photography like the one in the link? Or, maybe one like this that isn't so dark that it prevents composing when the filter is mounted. Either one may be of absolutely no use on digital, but on b&w film they are the bomb.
    Last edited by Barefoot; 06-30-2016 at 02:30 PM.
    We don't see things as they are, we see them as we are. -Ana´s Nin

    http://barefoot.pixu.com/

  3. #3
    Shinnen's Avatar
    Shinnen is offline Member
    Join Date
    Sep 2015
    Location
    Markham, Ontario
    Posts
    52
    My Photos
    Please do NOT edit my photos
    Critiques
    Critique my photos anywhere in the forum

    Default

    Hi Barefoot,
    Yes, I've considered them, and I think they might work; but right now I'm using a couple of polarizers that I had lying around, which seem to produce a decent result. The only problem is .... I'm not sure what they're doing, i.e. are they doing the same thing as the filters you mention.
    Thanks,
    .... john

  4. #4
    Marko's Avatar
    Marko is offline Administrator
    Join Date
    May 2005
    Location
    Montreal, QC. Canada
    Posts
    14,116
    My Photos
    Please do NOT edit my photos
    Critiques
    Critique my photos anywhere in the forum

    Default

    we need to see the images..... Normally we use the filters barefoot recommended OR the camera is already converted so we don't need the filter.

    Polarizers cut reflections.... it's a different beast altogether. ND filters have nothing to do with this.
    - Please connect with me further
    Photo tours of Montreal - Private photography courses
    - Join the new Photography.ca Facebook page
    - Follow me on Twitter http://twitter.com/markokulik
    - Follow me on Google+ https://plus.google.com/u/0/111159185852360398018/posts
    - Check out the photography podcast


    "You have to milk the cow quite a lot, and get plenty of milk to get a little cheese." Henri Cartier-Bresson from The Decisive Moment.

  5. #5
    Shinnen's Avatar
    Shinnen is offline Member
    Join Date
    Sep 2015
    Location
    Markham, Ontario
    Posts
    52
    My Photos
    Please do NOT edit my photos
    Critiques
    Critique my photos anywhere in the forum

    Default

    Hi Marko,
    Right. Well, this camera does have an IR mode, but the images are kind of lack lustre, with a green tinge. When I put the double polarizer on, the sky and water turn very dark. I must emphasize that I resorted to this method because of Sony's crippling the camera in IR mode, making it impossible to shoot outside in daylight. The two pictures I'm sending were just taken. (It's overcast here, so the sky isn't as black as on a sunny day, and the clouds aren't as white.) The first image is with the double polarizer and the next one (the control) is with an ND filter, only. (I had to use an ND filter, otherwise the picture would be just white.) It think the double polarizer has the added benefit of removing any remnants of colour from the picture.
    ..... john

    Name:  DSC04790double poarizer.jpg
Views: 19
Size:  87.7 KB

    Name:  DSC04791ND filter.jpg
Views: 20
Size:  94.1 KB

    P.S. If you want to see another example using the polarizers, look here http://www.photography.ca/Forums/att...sc04595mod.jpg The black pond is ice and the sky is blue.
    Last edited by Shinnen; 07-01-2016 at 02:16 PM. Reason: clarification, addendum

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36