[Leica] geebee Ilford SFX processing

[henningw at archiphoto.com (Henning Wulff)]

>I have a feeling that the best results from this film come from the 
>way that Graham is using it. He's bringing out a partial IR 
>reflectance from the foliage which gives it a nice glow while 
>maintaining the normal visible light view of the low IR reflectance 
>objects like stone and wood. The R25 filter will also add increased 
>contrast to the clouds and sky like normal bw film. The resulting 
>photos have a different look to them which I find very pleasing.
>
>And the film seems to be a lot cheaper then Kodak's HIE which is 
>probably a lot more sensitive to infra red.
>
>Nice photos, Graham,
>Len
>

I agree. This film is not really suitable for use with 'real' IR pass 
filters. The standard red makes the most of this film and Graham has 
once again done a masterful job.

>
>On May 18, 2007, at 7:46 PM, Henning Wulff wrote:
>
>>At 7:21 AM +0100 5/18/07, geebee wrote:
>>>From: "John Biava" <leicam4pro@yahoo.com>
>>>To: "Leica Users Group" <lug@leica-users.org>
>>>Sent: Friday, May 18, 2007 12:53 AM
>>>Subject: Re: [Leica] geebee Ilford SFX processing
>>>
>>>>
>>>>  The exact characteristics of the filter you are using also make 
>>>>a big difference.  A R 25 is not really an IR filter, but seems 
>>>>to be about all that is readily available now.
>>>>
>>>------------------------------------------------------------------------------------------------
>>>John,
>>>
>>>I have a Leitz IR filter in 48mm for my 90 cron which I had 
>>>completely forgotten until I read your post so  I may have to 
>>>revisit SFX. I think also that SFX just has heightened sensitivity 
>>>to red but isn't a true IR film.
>>>
>>>--Graham
>>
>>The Leica IR filter is similar in transmission characteristics to 
>>the Wratten 89B, B+W 092, Hoya R72 or Heliopan RG-695. With all you 
>>can see the light source through the filter if you hold it up 
>>toward it (don't do it with the sun!!). This filter is intended to 
>>come as close as possible to dividing the visible from the infrared.
>>
>>Heliopan has a series that includes the RG-645 (like the B+W 091, a 
>>dark red) through the RG-665,695,715,780 and 830. The 830 is like 
>>the Wratten 87 or B+W 093; ie, quite dense.
>>
>>SFX works with the 89B or Leica IR filters, but has a fairly hefty 
>>speed penalty with that; I forget what as I haven't used that film 
>>but once and didn't bother again.
>>
>>With the M8 you can use all the filters. In fact, with all of them 
>>you can just meter as normal and shoot. In fact, the meter is so IR 
>>sensitive you usually have to dial back a bit in the compensation 
>>about 1 stop so that you don't clip the red channel, which is where 
>>all the information is.
>>
>>--
>>    *            Henning J. Wulff
>>   /|\      Wulff Photography & Design
>>  /###\   mailto:henningw@archiphoto.com
>>  |[ ]|     http://www.archiphoto.com
>>
>>_______________________________________________
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>
>
>_______________________________________________
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-- 
    *            Henning J. Wulff
   /|\      Wulff Photography & Design
  /###\   mailto:henningw@archiphoto.com
  |[ ]|     http://www.archiphoto.com