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Infrared on MM


Guest Essemmlee

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I made more tests to compare red and IR filter

 

Leica M Monochrom with Super-Elmar-M 21mm/3.4

 

no filter

PP: Nik Silver Efex

8747319963_b3182d3790_z.jpg

 

red filter

(with blue sky the red filter would show more effect)

PP: Nik Silver Efex

vignette from wrong rubber lens hood

8747320619_7c59542db1_z.jpg

 

IR filter R72

PP: Nik Silver Efex

8747321321_e060abe42b_z.jpg

 

dierk

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I got a filter Heliopan R715 for the 35 LUX and the 21mm Super-Elmar-M and since I discovered the correct focus, and I love it :-)

 

Here are some examples:

all Leica M Monochrom with Super-Elmar-M 21mm/3.4 @ f/9, IR filter R715

 

(click for larger images)

the first two stitched pano

8881808309_ce2b396a7a_z.jpg

 

8904620027_67b7927296_z.jpg

 

8952431114_a8a66302e3_z.jpg

 

8952422676_bd9097fe35_z.jpg

 

dierk

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Great samples Dirk. Could you talk a little about how much of a problem focus shift is and if it's mandatory to use a tripod given what I suspect are low shutter speeds given how much light is blocked from the IR filter. What's your process to capture these shots?

 

Thanks.

 

Erik

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thanks, Erik :)

with ISO 360 and f/9 I have 1/2 second with this sort of light. That means tripod, and using the tripod it is just easy to do some more shots left and right and get the panoramic view, you may wont in these landscape shots.

You may find more IR shots here:

Infrared - a set on Flickr

You get the EXIF under the little three dots at the bottom of the images.

dierk

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sorry, Erik, I forgot this question.

 

I set the focus between the max aperture and the next one stop down on the DOF scale ring of the lens (on Leica lenses it is on the left of the focus scale. With wide angle lenses and f/9 you get enough DOF to compensate any errors. With long lenses this will be a problem without focus bracketing and you have to do tests.

I am afraid, zoom lenses don't have this scale for the DOF.

 

I hope, you will understand, what I mean with this scale?

regards

dierk

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Comparison of real IR and simulated IR

 

Leica M9 with Canon 17mm TS-E tilt/shift

PP: LR4

8980203721_636afcb598_z.jpg

 

 

Leica M9 with Canon 17mm TS-E tilt/shift, IR simulation

Postprocessing:

LR4:

normal development, for the IR effect increased luminance of green and yellow and decreased blue

Nik Silver Efex for IR simulation:

"normal" development, strong red filter, in film types (I have the German version, so it could be called different in the English version!) increased sensitivity for yellow and green and decreased blue

some UPOINTs to lighten the trees and grass and increase contrast in the building

8981389206_da7410f1c2_z.jpg

 

Leica M Monochrom with Super-Elmar-M 21mm/3.4 @ f/9, IR filter R715

8987367460_009214821f_z.jpg

 

dierk

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  • 1 month later...

Monochrom, Summicron 50mm AA, 093 filter, f/2 @ 8 seconds

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Comparison of real IR and simulated IR

PP: LR4:

normal development, for the IR effect increased luminance of green and yellow and decreased blue

Nik Silver Efex for IR simulation:

"normal" development, strong red filter, in film types (I have the German version, so it could be called different in the English version!) increased sensitivity for yellow and green and decreased blue

some UPOINTs to lighten the trees and grass and increase contrast in the building

dierk

Thank you Dierk!

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:rolleyes:

 

 

. With the RG 715 filter, the Wood effect looks good with both cameras but the image quality is much better in the M Monochrom ... even though the M9 is slightly more sensitive in the IR range, the M Monochrom more than compensates with better sharpness, finer tones, and less noise despite higher ISO.

 

The M8 might be somewhat better still; I don't know ... but the M Monochrom most definitely is not entirely unsuitable for IR work.

 

Thank you all for this very interesting discussion!!!!

 

It is clear that the MM has a low response in deep red wave length. The transmission of the cover glass is 11% at 650nm (for a thickness of 1mm, the MM glass has a thickness of 0.8mm and transmission has to be calculated accordingly) and the Quantum efficiency of the sensor at 650nm is 9%, so the total response at that wave length is low.

 

But there is an another factor to consider. Whereas the M8 has a better transmission, it also has a Bayer array. That means that only 1/4 of the pixels (the red ones) will take advantage of the higher IR transmission, the other one are completely blind. Simply put, you have 4 time less resolution in Bayer vs Monochrom for deep red imagery.

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