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[OM] Comment on resolution, was Third party lenses

Subject: [OM] Comment on resolution, was Third party lenses
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Wed, 20 Aug 2003 08:41:04 -0400
Moose commented:
Of course, shooting the same subject from a given spot, the 600mm lenses
will resolve more detail than the 500mms with the same measured
resolution because of the greater magnification.
------------------------------------------------
Separated from the ugly realities of real optical design and manufacture, the _theoretical_ resolution of a lens increases with its diameter. A 600 mm f/8 has a larger objective lens diameter than a 500 mm f/8 and thus a higher theoretical resolution. Resolving power and light gathering ability are why large diameter telescopes are to be preferred over smaller ones.

In the end, of course, one has to pay attention to the realities of coma, diffraction, contrast, chromatic and spherical abberation, etc. In other words, why doesn't your 55mm f/1.2 perform best wide open.

Chuck Norcutt
Woburn, Massachusetts, USA



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