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Thread: Digital IR

  1. #471

    Join Date
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    Re: Digital IR

    Quote Originally Posted by sanking View Post
    Interesting point, and with very low signal strength I am sure you are right. I have from time to time experienced a condition in photographing in nature in areas where there was no artificial light late in the evening when the gain in IR sensitivity around the time of sunset went from fair to non-existent in an instant.
    As it happens, I do quite a lot of IR photography at night -- the photo below is a typical example -- and you are correct: Without the sun visible in the sky, there is next to no natural IR light available, only artificial light and not always a lot of that.



    Balancing exposures in these conditions is tricky, because too much exposure blows out the highlights and not enough exposure makes it difficult to tease any detail from the shadow areas. This is where the median-blending technique I discussed above pays huge dividends, because it allows one to lift the shadows several stops without sacrificing the highlights or the final, finished photo looking completely unnatural, which (IMO) often happens when HDR techniques are used.
    JG

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

  2. #472

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    Re: Digital IR


    Chippewa by tuco, on Flickr

    M9, Zeiss 35mm, R72

  3. #473

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    Re: Digital IR

    Nice one Tuco!

  4. #474

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    Re: Digital IR

    Quote Originally Posted by jon.oman View Post
    Nice one Tuco!
    Thanks Jon. I'm thinking I should have taken the filter off and compared converting color to BW with the R72 filter version in a picture like this with no foliage.

  5. #475

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    Re: Digital IR

    Okay, my first median-blending. This was with the 950nm filter. The tripod was used. I used 'continuous release' low, with the maximum shots allowed set to nine. Everything was done using 'live view' mode.

    Photoshop: You can also combine images using a script (File > Scripts > Load Files into Stack).
    Turns out the base ISO for the Nikon D810 is 64. I really should have read the manual!

    The first shot in this series you have seen before. I have never been happy with what I have gotten before. Now, I can say I am happy!



    2021:09:04 12:04:25 : NIKON D810 : 48mm : 64 ISO : F7.1 : 1 sec : 5/3 EV



    2021:09:04 12:17:35 : NIKON D810 : 70mm : 64 ISO : F7.1 : 5 sec : 5/3 EV



    2021:09:04 12:10:57 : NIKON D810 : 38mm : 64 ISO : F7.1 : 2 sec : 5/3 EV

    For the swing image, I still have not allowed for the wind. I'll work on that next time.

  6. #476
    Peter De Smidt's Avatar
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    Jan 2001
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    Fond du Lac, WI, USA
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    8,510

    Re: Digital IR

    Good work, Jon!

    And now back to class work...
    “You often feel tired, not because you've done too much, but because you've done too little of what sparks a light in you.”
    ― Alexander Den Heijer, Nothing You Don't Already Know

  7. #477

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    Re: Digital IR



    2021:09:05 12:12:46 : NIKON D810 : 32mm : 64 ISO : F7.1 : 2.5 sec : 5/3 EV



    2021:09:05 12:10:33 : NIKON D810 : 38mm : 64 ISO : F7.1 : 4 sec : 5/3 EV

  8. #478

    Join Date
    Mar 2014
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    95

    Re: Digital IR

    Nice images Jon, Tuco and Audii-Dudii!

  9. #479
    Tin Can's Avatar
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    Dec 2011
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    19,414

    Re: Digital IR

    I have noticed my iPhone front camera can focus in the dark

    Man Shares How to Spot Hidden Cameras in Airbnbs in Viral Video


    ..."To detect night-vision cameras, Hutchins recommends turning off the lights and using the front-facing camera on a smartphone to identify infrared LEDs. ..."
    Tin Can

  10. #480

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