[Leica] Digital cameras with large aperture lenses

[henningw at archiphoto.com (Henning Wulff)]

At 5:18 PM -0800 3/19/05, Frank Filippone wrote:
>Thanks Henning, that helped a lot.....
>
>So for a specific lens FL is there a point of Iris size and nodal placement
>where this is no longer an issue?  ie, are ALL F2 50mm Lneses equally bad?
>( Put in your own brand,  FL and Max F stop here... it does not
>matter...)....  Are the specs on a given FL about the same, regardless of
>brand name?
>
>This is now getting really interesting.......there is a lot to learn.....and
>a lot more to understand.....
>
>
>Frank Filippone
>red735i@earthlink.net

The variables are too many, Frank. Some lenses with the same max. 
aperture that look the same and act the same on film might have 
widely different rear nodal points, and also the size of the rear 
nodal plane is not the same for a given aperture and FL. Then come 
the sensor variables....

You just have to try and see.

A couple of months ago I posted various vignetting patterns with 
wideangle lenses on the R-D1, all taken at f/8. You can see the 
different amounts of vignetting on different lenses, like the 12mm 
Cosina was better than the 15, and the 21ASPH was a lot better than 
the 21VC (all at f/8, remember). This shows that the differences 
might be more due to lens design than the apertures per se.

http://www.archiphoto.com/Various/RD1vignette/index.htm

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    *            Henning J. Wulff
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