[Leica] IR photography with M8 and Elamarit-M 24/2.8

[Frank Verizon]

I used cheap China filters. Your exposure needs will be different from mine as the response of the filter will be different. Use what I said as a guideline or starting point.  Also, your combined spectral response will be different. Your images will be different from mine.

About other filter cutoff frequencies....  This is a Physics/optics issue...
Your M8 has a certain frequency response, with the feature that as you go up in frequency, the sensor becomes less sensitive. The IR filter is a high pass filter, essentially eliminating lower frequencies.  Essentially, you could get very low sensitivity with the wrong combination.. Loooooooooong exposures.
Try out any combo you want.  It will become quickly obvious what works for you. 

I miss my M8.

Frank Filippone
Red735i at verizon.net

On Nov 12, 2015, at 9:08 AM, Howard Ritter <hlritter at bex.net> wrote:

Thanks, Nathan. I’ve ordered the B+W 093 55mm filter. In Heliopan terms, it would seem to be an 830, so I’m expecting some pretty pronounced effects.

—howard


> On Nov 12, 2015, at 12:46 AM, Nathan Wajsman <photo at frozenlight.eu> wrote:
> 
> Hi Howard,
> 
> I use Heliopaln 665, 695 and 715 filters. Obviously, the IR effect is stronger with the 715. I don’t remember how that translates into the BW terminology. Heliopan’s numbers indicate the wavelength.
> 
> As for filter size, I see no reason why a Leica lens labelled E55 would not accept ordinary 55mm filters. I have always bought non-Leica filters for my Leica lenses (BW, Heliopan).
> 
> Cheers,
> Nathan
> 
> Nathan Wajsman
> Alicante, Spain
> http://www.frozenlight.eu <http://www.frozenlight.eu/>
> http:// <http://www.greatpix.eu/>www.greatpix.eu
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> YNWA
> 
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>> On 12 Nov 2015, at 06:15, Howard Ritter <hlritter at bex.net> wrote:
>> 
>> I’ve seen numerous images recently on the forum done with the M8 and an IR filter, but the search function in the archives is down at the moment, so I’d like to ask two things:
>> 
>> 1. What filter is recommended? The B+W 093 appears to result in good images from what I’ve seen online, but its specifications seem to indicate that it admits only wavelengths longer than where the M8’s filter starts to be really effective. OTOH, the 092 filter appears to pass a good deal of visible red, not what I’m after.
>> 
>> 2. My Elmarit-M 24/2.8 takes E55 filters. B&H lists nothing in E55 except a few Leica UVA/IR blocking filters, obviously the opposite of what I’m after. Will this lens take standard 55mm filters? For some reason, the answer to this seemingly simple question has been astoundingly difficult to find by googling.
>> 
>> Thanks for any advice,
>> —howard
>> 
>> 
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