[Leica] IMGS: IR Attempts

[Jim Nichols]

Tina, I have never done IR, but I've read enough to be dangerous.

It  looks like you got close to what you want in 3371.  The exposure is 
close to perfect.

On the old LTM lenses, such as the Summitar that I have above my 
computer, there is an IR focusing index, marked by an "R".  The 
procedure, as I recall it, was to focus with the rangefinder, note where 
the normal focusing index fell on the scale, and then move the RED index 
to the same point on the scale.

On the Summitar, the RED index is about 1/16 of an inch to the right of 
the normal index, but this can vary from lens to lens.  I would suggest 
you mount your camera on a tripod and then vary the focus point plus or 
minus about 1/4 inch in small steps, and then chimp the images.  You 
should be able to find a point that is close to correct for any 
particular lens.

Jim Nichols
Tullahoma, TN USA

On 8/31/2016 6:49 PM, Tina Manley wrote:
> LUG:
>
> After seeing the great IR photos posted here lately, I finally dug out my
> old M8s (the ones that fell in the river but are still working fine),
> charged up the batteries, and found a B+W 092 filter in the drawer that fit
> my 21/2.8 Elmarit.  I went out around the farm and photographed a few
> things.  Lots of problems.  Nothing looks sharp.  What am I doing wrong?
> None of the EXIF is right.  Most of these were made at ISO 160, around 5.6,
> and usually 1/30 or more exposure.
>
> http://www.pbase.com/tinamanley/image/163998663
>
> and the next 5.   Is there a trick to focusing with the dark filters?  I do
> like the tones so I would like to learn how to do this, but it has to be in
> focus to work for me!!  I got some great photos of the cat yawning that are
> so out of focus I won't bother to post them!!
>
> TIA
>
> Tina