Re: IR with *istDS

[Mark Cassino]

Some digitals did not incorporate as strong of an IR filter, or in come 
cases, any IR filter at all, so you can get better results from them.  The 
RM 90 blocks everything below 820 nm in wavelength, so you are into the 
purely IR end of the spectrum.  This filter won;t work with near IR films 
like SFX and Konica IR 750.

Personally, I like using Kodak HEI. A lot of what I associate with the IR 
effect is actually characteristic of this film - like the graininess and the 
diffusion effect caused by the lack on an anti-halation layer on the film. 
And it really pushes into the IR end of the spectrum.  But, you are never 
quite sure how to meter and it is expensive.

- MCC
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Mark Cassino Photography
Kalamazoo, MI
www.markcassino.com
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----- Original Message ----- 
From: "William Robb" <[EMAIL PROTECTED]>
To: <pentax-discuss@pdml.net>
Sent: Saturday, April 16, 2005 9:51 AM
Subject: Re: IR with *istDS


----- Original Message ----- 
From: "Mark Cassino" Subject: Re: IR with *istDS


I've done a little IR with the *ist-D and a Hoya RM 90 (Wratten 87B 
equivalent, I believe.)  Maybe this filter just blocks too much light, 
but you need long exposures even at high ISO and bright light.

I did some IR with my old Canon G1.
It worked really well.
Were I interested in doing IR, I'd be looking for one of these cameras.
William Robb