This completely ignores the need for a macro lens. If I had a macro lens I wouldn't have to crop so damn much. Well, that and I have no idea what I'm doing.I'm super-fond of my 100mm f2.8. It's delivered for me more than a few times...
Only Sigma DSLRs have a 1.7x crop factor. All other non-Canon crop DSLRs have 1.5x (really about 1.52-1.53x or so) and Canon DSLRs have 1.6x, which makes 35mm lenses perfectly reasonable choices to achieve a 50mm POV. Four-thirds DSLR's (Olympus, Panasonic) have a 2.0x multiplication factor for POV equivalency but not really cropping, as their lenses natively have much smaller imaging circles.So the Panasonic/Leica 25mm f/1.4 has the POV of a 50mm lens (in terms of traditional 35mm photography). It's also the biggest and heaviest of the "50mm POV" lenses on the market -- 24% heavier than the Sigma 30mm f/1.4 for other crop body systems and 76% heavier than the Canon 50mm f/1.4 for full-frame bodies. And coming from a name like Leica -- renowned for their compact, jewel-like rangefinder lens -- it's more than a bit disappointing.
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"Zoom with your feet" indeed. Suddenly I remember why I was always moving around so much when I was framing shots in high school photography class. Shooting someone head and shoulder in a small room is actually tricky.
It's a nice width for getting a close portrait without having to get right up in someone's face. And a reasonably fast 50 will open up enough that you can really isolate your subject against a less-focused background without much trouble (see DaShiv's excellent comment on the subject of fast lenses and depth of field). And the 50 f/1.8 is just nuts cheap.
posted by cortex at 5:57 PM on October 2, 2007