Using IR creatively

[jaapv]

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Ir sensitivity is not always a bad thing,I deliberately removed the IR filter, to differentiate between the various lights in this village:

 

 

Magic Village

 

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[carstenw]

That cannot be Holland! The hills are too large

[Vivek Iyer]

Jaap, Have you thought about hanging up your (working) gloves and replacing them with your M8s?

[jaapv]

Jaap, Have you thought about hanging up your (working) gloves and replacing them with your M8s?

 

 

Thank you very much indeed Patricia saw that. It confirmed her nagging:D

[Cindy Flood]

Thank you very much indeed Patricia saw that. It confirmed her nagging

__

 

Jaap, you can solve this problem by giving one of the M8s to Patricia. She can join the ladies here who are loving the M8 experience.

[Riley]

did you use a star cut filter jaap

or is that the aperture ?

[eronald]

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did you use a star cut filter jaap

or is that the aperture ?

 

Neat !

 

Edmund

[roubaix]

What a beauriful shot. Thanks for posting. Inpsires me to exploit this "feature."

 

Peter

[Guest stnami]

Inspires me to exploit this "feature."

.... and now for tomorrow's best "feature"....sardines that live in a can:eek: :eek:

[jaapv]

did you use a star cut filter jaap

or is that the aperture ?

 

Nothing. The shot was "naked" with the 24.

[Riley]

Nothing. The shot was "naked" with the 24.

 

i really didnt think a starcut was your style

'naked' would be a term i would use though ...

[jaapv]

The camera, mate, it was ten centigrade below.

[Riley]

The camera, mate, it was ten centigrade below.

 

thanks for clearing that up jaap ...

[rosuna]

The problem with the IR sensitivity is that it affects the white balance. Moreover, the IR light has a different focus plane than the visible light, so the images are somewhat blurred, lacking sharpness and contrast.

[jaapv]

Like the one I posted? In general you are right. But what I did was take a subject with localized IR light. The part that contains no IR light is unaffected. But the places that have IR get a rosy glow, which may be out of focus (slightly) without adverse effect, rather the opposite. The general white balance was, of course, determined in a place that was free of the IR. The camera itself, on the other hand, suggested a balance that was totally green. Don't try this in Jpeg. DNG only. The trick is to anticipate and correctly guess when and where IR light will be present.

[lars_bergquist]

Anyone who has tried using a M8 with a *real* IR filter, i.e. a deep red or black one? My own experience extends only to dark orange filters, which seem to work like with black-and-white film, though possibly with a bit more effect.

 

The old man from the Age of Chemical Photography

[jaapv]

Yes I did; it is somewhere on the forum,it works just fine, I am waiting now for fresh green foliage to come out to go outdoors.

[donquixote]

The first image is a composite of test Images made with Leica M8 in A-Mode, Iso 1250, 50 mm f2.0 Voigtlander Heliar Classic, at f 4.0. The foliage was metered through a B&W 486 filter for the RGB image and through an off-brand Orange (only red-ish filter I had; maybe Wratten 15 or 16) filter for the "IR" image. All color images were converted to grayscale in Adobe Lightroom. After obtaining B&W 090 (Wratten 89B) and Hoya 25A (Wratten 25) filters, the next four images were made, all hand held, the same way but at Iso 640. They were metered and shot through the respective filters in A-Mode. Hyper-focal focusing was used for all sky images. The rangefinder was used for the boat. Images two and three are with 89B filter, lens at f 4.0, and four and five are with 25 filter, lens at f 8.0. Shutter speeds were 1/30 and above. Seems to me that M8 works very nicely for "Infrared" monochrome pictorial photography. I have notes that I made in the early 1950s, yes over 50 years ago, using Kodak Infrared 35 mm film. I rated the film and Wratten 25 filter combination at Iso (ASA) 2 for close subjects and 6 for distant scenes. M8 is a dream to use by comparison!

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Hallo,

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[Woody Campbell]

The problem with the IR sensitivity is that it affects the white balance. Moreover, the IR light has a different focus plane than the visible light, so the images are somewhat blurred, lacking sharpness and contrast.

 

I've done a fair amount of experimenting with IR and IR blocking filters - I'll start a thread if I ever get the time to do so. (I work only in B&W.)

 

Here's the bottom line:

 

1. None of the modern Leica lenses that I've tried focuses an IR image - in other words through an IR filter the image is out of focus - there is no focus adjustment that will bring the image into focus.

 

2. BUT, the IR images requires six stops (roughly) more exposure than the normal image. In other words if I take a normal exposure, then add an IR filter with the same f-stop and shutter speed the image is under-exposed by 6 stops or so (maximinum values read from PS from a shiny leaf for example are in the 30 to range (out of 256)). When I make a dark-sky, white foliage shot with my IR filter I have to increase the exposure by six stops from where I would be without a filter.

 

3. Working in visible light, visually I can't tell the difference in micro contrast and fine detail with or without an IR cutting filter: in this respect the six-stops under-exposed IR light is too little to notice.

[richam]

Woody,

 

(1) Have you tried the "R" offset for focusing? You might not have a lens with this marking, but I've had success with IR film and my 35mm summaron. The lens has a little "R" that shows the infrared offset. Once you focus, you look at the spot where focus is achieved, and then move that spot from the main focus line over to the "R." The M8 technique you describe -- f11 to f22 for proper focusing -- drives one to use a tripod. It might work hand held with the focus offset.

 

(2) Do you always have a flare problem? This could be a limiting factor in the usefulness of the M8 for IR. Pehaps something with the design of the innards of the M8 makes it overly succeptible to flare in the IR range.

 

Thanks in advance.