Infrared, Just Started.

Discussion in 'Beyond the Basics' started by chris_arnet, Jan 13, 2008.

  1. chris_arnet

    chris_arnet TPF Noob!

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    Allright, my first two IR photos. Hoya R72 on a Canon 50mm f/1.8, Mounted on a Canon 20D. I know that the 50mm prime gives me limited creative ability, but I didn't wanna drop $250 on a filter before I had infrared basics down. I've been noticing alot of image quality loss too. Any pointers or suggestions? For Image quality loss or just IR in general.

    [​IMG]

    [​IMG]


    Any help appreciated, Thanks.


    Chris
     
  2. Sideburns

    Sideburns TPF Noob!

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    I'm not sure, but part of the quality loss could be focus, and part is the long exposure noise. How long were these?
     
  3. chris_arnet

    chris_arnet TPF Noob!

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    I focused carefully and then screwed the filter on. Exposeres were anywhere from 10 to 25 seconds, I bracketed like crazy and don't remember. Still, it shouldn't make the fallen pavillion that soft though...
     
  4. Cero21

    Cero21 TPF Noob!

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    Your quality loss could be attributed to the loss of the 1 blue and 2 green sensors for every 1 red sensor on your camera. Therefore shooting IR cuts your total megapixel count to 1/4 what it was. Hope that makes sense.
     
  5. Sideburns

    Sideburns TPF Noob!

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    The reason I say your focus could be off...depending on how dark the filter is, the focus point changes.
     
  6. chris_arnet

    chris_arnet TPF Noob!

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    So i now have a 2.05 magapixel camera?
     
  7. Cero21

    Cero21 TPF Noob!

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    effectively
     
  8. chris_arnet

    chris_arnet TPF Noob!

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    well, that sucks.
     
  9. shorty6049

    shorty6049 TPF Noob!

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    The IR filter , (Hoya R72 i'm assuming) WILL change your focus point a little. Thats why some lenses have a little "r" or a red dot on the focus scale to show you where you'd need to line up your focus for IR work. I always just focus in and out taking shots each time until its sharp. (i shoot at a very high iso so the exposures are like 2 seconds each) then i set it back to like 100 ISO, and shoot the final image. that usually works pretty good. also, i've heard that cameras focus with IR light anyway, so you SHOULD just be able to frame the shot, then put the filter on and focus with it on and it'll still work, but i find that its always still a little off....
     
  10. shorty6049

    shorty6049 TPF Noob!

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    i hope you dont mind, (if you do let me know and i'll remove it) but i played around with your first image a little (cleaned it up and did a channel swap)

    [​IMG]
     
  11. chris_arnet

    chris_arnet TPF Noob!

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    i love that dude. i have elements, so i cant channel swap.

    i do frame without the filter. and focus, but its always OOF after i take the pic. And my 20Ds LCD screen is small, so everything always looks nice and sharp.
     
  12. Alpha

    Alpha Troll Extraordinaire

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    First, never judge your shot by the LCD unless you're looking at the histogram.

    Second, adjust the focusing to compensate for the aberration. If your lens doesn't have an IR guide mark, then do the math. There are lots of resources on the web that will instruct you on IR focusing.
     

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