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Thread: Digital IR

  1. #381

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    Re: Digital IR

    Quote Originally Posted by alan_b View Post
    I'd be curious to see how the new Voigtlander 35mm APO-Lanthar works, but they won't work on a Nikon DSLR (Sony E mount).
    Is this the lens?: https://www.bhphotovideo.com/c/produ...tml?ap=y&smp=y

    Then here is an adaptor: https://fotodioxpro.com/products/lmv-nkf-p

    That should work?

  2. #382

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    Re: Digital IR

    "No, it's a lens property - how many wavelengths it was designed it to focus simultaneously. "

    Exactly, and I suspect that the Apo-Lanthar would give very good results in IR, unless of course it has a coating hot spot. Apochromatic lenses are designed so that the light of the visible spectrum, from about 400 nm to 700 nm, ( red, green and blue light) lie together in the same image plan. 720 nm IR is just outside the visible spectrum so generally is the sharpest of the true IR bandwidths and should in theory work well with any Apo lens designed for visible light. IR wavelengths longer than 900 nm are well outside the optimum wavelength of most lenses, and of course show the highest degree of lens aberration. However, several of my modern Zeiss lenses for the Sony a7r cameras give excellent results in IR, unless of course they have IR hot spots. Of these the best one I own is the 55mm f/1.8 Zeiss/Sony, and it works equally well in visible as in IR.

    Sandy
    http://www.sandykingphotography.com/
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  3. #383

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    Re: Digital IR

    Quote Originally Posted by Audii-Dudii View Post
    This is truly surreal ... nice!
    Out in the smoke earlier today - not sure I even need IR for the surreal in conditions like this! (Yes, I had a respirator on.)

    Click image for larger version. 

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  4. #384
    Peter De Smidt's Avatar
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    Re: Digital IR

    Yikes, Alan!
    “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

  5. #385

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    Re: Digital IR

    Click image for larger version. 

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    Couple of recent shots from nearby, one is a kudzo rich scenes from near Bat Cave, NC. The other a view of Chimney Rock. Kudzu is very impressive in SC and NC this year, due to warm temperatures and lots of rain. Can grown as much or more than a foot a day in August and September with favorable conditions.

    Both shots were made with a Sony a7r 2 converted to 720 IR, with a Sony/Zeiss 24-70 mm zoom. Some processing was done in Camera Raw.

    Sandy
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at groups.io
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  6. #386

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    Re: Digital IR

    That kudzo sure does grow! I like the first image Sandy. For the second, I really want to take a chain saw to the tree in the center! I wish there were a few rocky hills where I live, but then it would not be the 'low country'.

  7. #387

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    Re: Digital IR



    D800fs / IR Chrome filter

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  8. #388
    Peter De Smidt's Avatar
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    Re: Digital IR





    Lake Redstone Falls
    Last edited by Peter De Smidt; 23-Aug-2021 at 08:17.
    “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

  9. #389
    Unwitting Thread Killer Ari's Avatar
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    Re: Digital IR

    Too hot to venture far today, so I stayed in the neighbourhood.
    Sony a6300, 16mm Tamron, 830nm




  10. #390
    Unwitting Thread Killer Ari's Avatar
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    Re: Digital IR

    Sony a6300, Tamron 16mm, 830nm


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