When choosing a 150mm lens, what criteria do you use to choose between lenses? I'm looking at 150mm lenses but notice there are quite a range of them for specifications, namely angle of view. Realizing that use is an important criteria, landscape, architecture, etc., but you could only afford one lens, what criteria would be most important? An example is the Schneider 150mm Symmar series and Symmar XL lenses.
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