Re: [OM] Questions, questions...

[Lars Bergquist]

Wrote Ingemar from Gislaved:

>I guess internal focus is a newer design than "normal lens focusing", if
>so they
>must have developed it to give lenses improvement. Now, how much better in
>performance is an IF lens compared to a "normal"?Just curious.

Internal focusing does not per se improve performance. It is basically no
different
from front cell focusing (on those old folders), it just does away with a
long and
cumbersome helical on long lenses. Perhaps some people mix this up with
floating elements which is a different matter. This reconfigures
helical-focusing
lenses internally in order to optimize performance over a greater range of
magnifications (I seem to have heard that lenses normaly are optimized for
a focusing distance of 10 meters).


Hälsningar/Regards
Lars Bergquist
Timberwolf Type, 'the independent
specialist in text typefaces' - visit me at
http/www.timberwolf.a.se/



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