Re: [Rollei] Schneider - Zeiss debate

[Robert Monaghan <rmonagha >]

Richard noted:
With this sort of test the focus becomes very critical.  The viewing lens
must exactly track the taking lens, and using a high power loupe to
improve focus can have a large effect.
unquote

see http://medfmt.8k.com/mf/critical.html for charts and details; a few
millimeters of focusing scale error can drop resolution levels by 40-50%
with high resolution films. The solution is to shoot a series of shots
at different focus points, and pick the highest resolution ones (or use
aerial resolution techniques..) for comparison, and even that is problematic

* Robert Monaghan POB752182 Southern Methodist University, Dallas Tx 75275  *
* Third Party 35mm Lenses: http://people.smu.edu/rmonagha/third/index.html  *
* Medium Format Cameras: http://people.smu.edu/rmonagha/mf/index.html       *

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