quick-and-dirty comparison of flare and stray light

sebastel

sebastel

coarse art umbrascriptor
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Jul 10, 2006
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as a number of 50mm lenses of varying age and condition have collected in my cabinet, i had the idea of comparing them for flare and susceptibility to stray light.

conditions were worst case: i took pictures with my computer monitor at the border and outside the field of view. the monitor had a distance of about 1 meter, while the focus point was at about 2.5 meters.

focus was on the staple of printing paper on the window pane. outside the window, you can see street light at a distance of about 500 meters.
pictures were taken fully open, and at 1.4, 2.0 and 4.0 where available.
pictures were taken with a leica M9, set at ISO 200, internally processed for black & white with high contrast. no post processing. exposure time was determined with a gossen sixtomat digital (incident light metering at the point of focus).

the lenses included in this comparison are:
an uncoated leitz elmar, with scratches in the front element,
a single coated industar 50,
an uncoated summitar with round aperture blades,
a single coated summitar with hexagonal aperture blades,
an uncoated carl zeiss jena (prewar) sonnar 5cm/1.5,
a single coated carl zeiss jena (postwar) sonnar 5cm/2.0,
a carl zeiss ZM sonnar 50mm/1.5,
a carl zeiss ZM planar 50mm/2.0,
and finally a cosina voigtlaender nokton 50mm/1.1.

you can find the pictures (including full resolution) in my flickr set "coating and flare":

http://www.flickr.com/photos/83765003@N00/sets/72157628801338983/


hope this is of interest to someone ...

cheers,
s.


edit: sorry for the messed sequence of the pictures in the flickr set. that was the flickr upload program, not me!
 
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