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5th of January in Finland....normally it would be -20 at least but yesterday +4 degrees of Celsius and light rain...not nice
Give credit to Schneider that their idea of advertising is a dense page of technical text.
The "normal=diagonal" rule of thumb is well known but there are some other strange ones proposed in the first paragraph, re: what focal lengths would be considered wide-angle, portrait lens, etc. for each format. For example on 24x36mm full-frame, would you consider an appropriate portrait focal length to be 60mm?