Re: Konica IR ...!st time, hyperfocal focusing, and Stigmata

[Eckhard Stephan <eckhard.stephan@xxxxxxxx>]

"Christina Z. Anderson" wrote:
> 
> Therefore, if I focussed not close enough (i.e. not on the infrared mark on
> the camera lens which is a bit closer of a focus than the usual focus mark
> on a lens) the foreground might be more blurred and the background
> sharper....? 

Of course you're right, I just tried to imagine what might happen if you
focused too close...

You are right that the whole image being softened probably
> indicates something different, as it should be sharp somewhere in the image
> if it is a hyperfocal problem....whatever the case may be, maybe if I
> tripodded or didn't blow up the image to 11 by 14....maybe I am too used to
> sharpness from 4 by 5 and Tmax and the Konica is just less sharp (?)  

Definitely not. I got some VERY sharp Konica IR pics, 135mm enlarged to
16x20 inch (40x50 cm)...;-)) I think the problem is that you didn't use
a tripod. Personally I found it almost impossible to do handheld shots
on Konica IR...
 
Do you
> use the infrared focusing mark on the lens with Konica or maybe Konica does
> not require that and just Kodak does?  

As usual, different people, different experiences... It depends on your
equipment: Normal or apochromatic lens? For which wavelenghts does the
focussing mark apply? etc... With HIE, I do not use focus corrections
with a Wratten #25, just small apertures. I do however focus according
to the infrared mark with my Wratten #87 opaque filter. 
Konica ? I'm just running a test series with tele lenses at large
apertures (3,5; 4,5)... To be honest, I still haven't found the ideal
solution. Focussing according to what I see isn't enough, half way
between the normal and the ir focussing mark is already a little bit too
much... As long as conditions permit small apertures, focussing isn't a
problem at all. Hope that helps,

Eckhard

-- 
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*          Eckhard Stephan             * 
*          Freiburg (Germany)          *
*     eckhard.stephan@xxxxxxxx         *	
*   http://www.eckhards-photobox.de    *   
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