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Infrared photography with SL


steppenw0lf

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Hi,

has anybody tried to take infrared photos with the SL ? For example with the heliopan filters ?

Could you share your experiences ? 

The main question is how much IR light is let through to the sensor (despite the internal IR filter) and so is it worth to do IR photography with the SL (or is the filter too strong and the camera simply too "blind" for IR) ?

 

Thanks for sharing your experience

 

Stephan

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Hi Stephan,

 

I don't have an SL but have tested the M in the past.  The Leica sensor filters tend to be on the weak side and I use Uv/ir filters on most lenses.

With a 092 filter the camera can be handheld with iso 6400 and an f1.4 lens in bright daylight, shutter should be about 1/30 iirc.   Otherwise tripod use will be possible with lower iso and smaller apertures.   

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Hi Stephan,

 

I don't have an SL but have tested the M in the past.  The Leica sensor filters tend to be on the weak side and I use Uv/ir filters on most lenses.

With a 092 filter the camera can be handheld with iso 6400 and an f1.4 lens in bright daylight, shutter should be about 1/30 iirc.   Otherwise tripod use will be possible with lower iso and smaller apertures.   

 

Hi Daryl,

thanks for your info, that's good news - let's hope the SL behaves similar to the M240. I understand that the IR-cut-filter is weak and quite a lot of IR rays can pass through to the sensor, correct ?

O92 means probably B+W dark red (infrared filter) 695 ?

I will probably start with a Elmarit-M 28, which uses small filters. Or another M lens (35 or 50) before I invest in the big 82mm filters.

I think 695 also lets through some visible light - so do you have to postprocess the images in SW ?

And finally do you have an example photo ?

Thanks again.   Stephan

Edited by steppenw0lf
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It would be interesting to see if the 093 gives better results than the 092. I read somewhere that the 093 was more interesting on the M but needed much longer pause and so much more difficult to focus...

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Hi Daryl,

thanks for your info, that's good news - let's hope the SL behaves similar to the M240. I understand that the IR-cut-filter is weak and quite a lot of IR rays can pass through to the sensor, correct ?

O92 means probably B+W dark red (infrared filter) 695 ?

I will probably start with a Elmarit-M 28, which uses small filters. Or another M lens (35 or 50) before I invest in the big 82mm filters.

I think 695 also lets through some visible light - so do you have to postprocess the images in SW ?

And finally do you have an example photo ?

Thanks again.   Stephan

You can find the spectral response curves of the 092 and 093 filter on the B&W website.

You will have to postprocess the files in B&W as they come out magenta, or go to the rather elaborate postprocessing to simulate false-colour film, there was a good article in LFI on the subject, years ago, but I cannot recall which issue.

You will find a list of suitable lenses (i.e. without hot spot) on GetDPI forums.

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See a quick test with SL+50APO-M with B+W 092 at f2, ISO3200, 1/20 sec with +0.7 exposure compensation in Lightroom, upper photo. This gives an idea of the exposure settings needed, in accordance with the comment by darylgo. More important, perhaps, is a rather weak IR-response from the leaves.

 

For comparison, the same scene - but now with M246+28Cron-M (2nd latest version) is also shown below (B+W 092, f2, ISO3200, 1/90 sec, without exposure comp in Lightroom). In this case a more typical IR-response is seen. In addition, this combo can be handheld.

 

I made a few additional tests confirming that SL would not be my first pick for IR-photo...

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Edited by helged
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I only say that M246 is (much) more IR-forgiving than the SL. I have hardly been into the IR-business after I put the Mamiya 7 (with the fridge full of HIE and other film-goodies) on the shelf 10+ years ago, so I do not claim that M246 is on the ideal tool, but it is clearly useable. Actually, I plan to (only) bring M246 with a few lenses and 092 filters to the French Alps in a weeks time. Mostly for fun...

Edited by helged
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Hi Daryl,

thanks for your info, that's good news - let's hope the SL behaves similar to the M240. I understand that the IR-cut-filter is weak and quite a lot of IR rays can pass through to the sensor, correct ?

O92 means probably B+W dark red (infrared filter) 695 ?

I will probably start with a Elmarit-M 28, which uses small filters. Or another M lens (35 or 50) before I invest in the big 82mm filters.

I think 695 also lets through some visible light - so do you have to postprocess the images in SW ?

And finally do you have an example photo ?

Thanks again.   Stephan

Without having an SL I can't comment on the strength of the Ir filtration, however I would seriously doubt the filter is overly strong.  The filtration has been weak on M cameras...possibly due to the ray angle and generalizing to the SL with its M lens adaptation.  

 

092 will allow part of the red visible spectrum and IR to pass through.  An 093 cuts all visible light and only allows IR.  An 092 can be used with a EVF on cameras such as the M240 for viewing, everything is red unless shooting jpg b+w and then the image appears b+w in the evf.  The 093 should not allow any visible light through.   Use the 092 for PP color images, use the 093 for pure b+w infra-red.  The 092 is the more versatile filter.  

 

There are many websites that will get you started, Lloyd Chambers has very thoroughly covered the subject on his subscription site including photoshop scripts.  

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