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fast glass?
everyone seems to want 'fast glass' - f/2.8, 1.7, 1.4, etc, but I'm left
wondering 'why' As most people know, lenses are not at their sharpest wide open - usually requiring f/7 - 9 (ish) before they attain their maximum potential. So why the fuss about 'fast' lenses?, and why pay the huge premiums to own them? Most of my own lenses are 2.8, with one at 1.7, and one at 1.4 - yet I invariably have to stop down in order to get a nicely sharp image, which sort of defeats the object of the 'fast glass', doesn't it? I mean, why pay three times the price for a 'fast' lens, when you only end up stopping it down? I've got a theory that it's the mania for bright lenses that's behind a lot of the 'focus fuss' that clogs up the various forums - perhaps people don't realise that you're just not going to get the same image quality out of wide open lens and are mistaking 'softness' for focus issues. Just a thought. |
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