[Leica] IMGs: Finding the "right lens/film/sensor/camera" combination:

[george.imagist at icloud.com (George Lottermoser)]

On Sep 10, 2015, at 3:53 PM, Jim Nichols wrote:

> What I have read this afternoon indicates that the latest Leica lenses are 
> focus-corrected to such high wavelengths that, for all intents and 
> purposes, no further correction is required.  Having no intention of 
> making such an investment any time soon, I did not spend a lot of time 
> following this back to its source.
> 
> Another slant on this was that Leica removed the IR index because it 
> confused their customers, and that it is really only valid at infinity, 
> anyway.  And, with zoom lenses, there are multiple correction settings 
> depending on where the lens is in the zoom range.
> 
> Most folks seem to feel that some experimenting is necessary to find the 
> most useful setting for the type of photography intended to be carried out.

Interesting.

Though my experience with the 093 IR filter from B+W
contradicts the claim;
at least for the 28 Summicron, 50 Summilux Asp, and 35 Summilux Asph.
Perhaps these are no longer considered the "latest Leica lenses."
Even if they did focus correctly;
they still all produce the significant hot spots;
and ever more prominently as you stop down.

And yes the proof is, as always, in the YMMV pudding.

Regards,
George Lottermoser 

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