Author Topic: IR Mania with old Nikkors  (Read 5369 times)

Řivind Třien

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Re: IR Mania with old Nikkors
« Reply #45 on: June 21, 2017, 00:25:28 »
Some lenses behave erratic meaning they may or may not make IR hot spots. It all depends on lens/camera combination, aperture setting, whether the filter is internal (in camera, over sensor), rear- or front-mounted over the lens; the filter type, and the general conditions under which IR shooting takes place.  Plus of course the kind of post processing conducted on the RAW files later. Some zoom lenses, such as AFS 17-35/2.8, AFS 24-79/2.8, or AFS 17-55 (DX) are typical examples. Amongst the older Nikkors, the 25-50/4 or 28-45/4.5 comes to mind.

One simply has to try and make the best of the situation. Not stopping down too far often helps. Some lenses can cope with f/8, are doubtful at f/11, and hotspots badly at f/16 and beyond.

I did some more testing of the 28mm f/2.8 AIS on my D40x IR-720nm and found only one situation that could trigger a hotspot: Shooting into deep shadows from bright sunlit surroundings stopped down to f/22. At f/14 there was barely any effect. Shooting against the sun at f/22 induced no hotspot, but of course some nice aperture ghosts, especially since I had an NC filter attached and forgot to take it off.
Řivind Třien

bobfriedman

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Re: IR Mania with old Nikkors
« Reply #46 on: June 23, 2017, 18:16:57 »
Nikon D800 RG1000,Nikkor 28mm f/2 Ai-S
1/50s f/5.6 at 28.0mm iso500


Nikon D800 RG1000,Nikkor 28mm f/2 Ai-S
1/60s f/5.6 at 28.0mm iso500
Robert L Friedman, Massachusetts, USA
www.pbase.com/bobfriedman

golunvolo

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Re: IR Mania with old Nikkors
« Reply #47 on: August 09, 2017, 13:58:50 »
Nikon 28mm f/2. Even if sometimes gives a subtle hotspot is mostly visible with certain post processing. Other times it shows as a "color vingeting" in the coners, I don´t know how to better express it. It works very well for me. Had to use it at f/8 most of the time for focusing issues, meaning I miss focus most of the time in IR. I

golunvolo

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Re: IR Mania with old Nikkors
« Reply #48 on: August 09, 2017, 20:33:16 »
It is not easy to see in the web but the image is full of fine detail, from the wire to the shells.
  This is also the first time I spend a long time with the file in photoshop: swaping channels, color bath in alien skin aperture, some masking, clonnig for defects in the sensor filter, etc... 

Akira

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Re: IR Mania with old Nikkors
« Reply #49 on: August 10, 2017, 02:33:08 »
Excellent framing in the first place!
"The eye is blind if the mind is absent." - Confucius

"Limitation is inspiration." - Akira

pluton

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Re: IR Mania with old Nikkors
« Reply #50 on: August 12, 2017, 06:10:52 »
It is not easy to see in the web but the image is full of fine detail, from the wire to the shells.
  This is also the first time I spend a long time with the file in photoshop: swaping channels, color bath in alien skin aperture, some masking, clonnig for defects in the sensor filter, etc...
A fine image.  Your time in the craftsmanship phase has rewarded us with a simple palette. You could give this JPEG more pixels if you wanted to.
Keith B., Santa Monica, CA, USA

golunvolo

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Re: IR Mania with old Nikkors
« Reply #51 on: September 21, 2018, 14:02:01 »
35mm f2 ai. One processed two straight out of the camera. All images at f8 with d200 IR 750nm.
I only have had one image with a slightly of center hotspot out of 75. Was shot at minimum focus distance if that has any impact?

Jakov Minić

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Re: IR Mania with old Nikkors
« Reply #52 on: September 22, 2018, 15:13:08 »
The wind turbines, through the fence, lovely!
Clash of old and modern times!
Free your mind and your ass will follow. - George Clinton
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golunvolo

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Re: IR Mania with old Nikkors
« Reply #53 on: September 22, 2018, 18:35:20 »
Thank you Jakov.
That was the d80 with custom cut filter (dremel  ;D) aks "Lola"