[Leica] candle, M8 and 50mm Summilux-ASPH

[pklein at 2alpha.net (Peter Klein)]

Re. <http://gallery.leica-users.org/v/Lee/Candle+and+M8/>

Lee:  Did you change the focus between shots #2 and #3, the lit candle 
alone and tungsten light alone?

I brought both up in an image editor, magnified a bit, raised the shadow 
levels of #2 so I could read the ruler, and compared it with #3.  The zone 
of focus is about 1/2 inch further back on the candle-alone shot compared 
to the room light shot.  If you didn't change the focus, it's evidence of 
an IR effect.  If you re-focused, it's within the margin of focusing error, 
and proves nothing.

--Peter, cautiously


>After seeing the other candle shots, I wondered what my camera and
>lens would do.  The candle was approximately 1 meter from the camera,
>which was on a table top tripod.  ISO 640.  The 20 inch mark was at
>the wick of the candle.  The purple in the left lower quad is from a
>purple covered book on knitting.  I had not noticed this until I
>downloaded to the computer.  The lens was at f1.4 and was focused on
>the wick of the unlit candle and on the flame as best as I could.  I
>think that the ASPH Summilux does better than the Noctilux in the other
>photos.
>Lee