Archived posting to the Leica Users Group, 1997/09/24
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I have just been chatting with an ex aerial photographer
who has informed me that normally there is a 40-50%
overlap beteen frames and that only the Center 25% of
the image is used to in making a mosiac for a map.
This means that a lens for aerial work must be very
sharp in the center & the rest is expendable since it isn't
used. This might or might not account for the alleged
use of the un-holy Canon lens by our un-holy agency.
How about it Irwin & Mark and any ex aerial photogs
on the LUG; Do you get flare from the infra red band
when using infra red film? I think that maybe a hi-speed
lens is necessary to overcome the exposure factor of
the red filter, as Leitz did have a proto-type f:0.85 with
one red element instead of a filter in WW2.
Marvin