Am I relying on SSS too much?

Started Jul 20, 2013 | Questions thread
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TFSJake
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Am I relying on SSS too much?
Jul 20, 2013

I know the old "50mm = 1/50 shutter speed" rule of thumb, and I know it doesn't exactly apply. So I'm asking, what would be a modern day equivalent of that with SSS? I know SSS allows you (theoretically) to shoot 3-4 stops slower than without it, so is this an acceptable rule:

I figure my crop factor makes my 50mm lens behave like a 75mm lens. That would necessitate a 1/80 shutter speed, in the pre-SSS days. Now, moving it down 2 stops would be 1/20, and even further 3 stops is 1/10.

Is this the proper way of thinking? I'll admit, it's 1 in the morning and I got out of bed to post this because it was bugging me, so I may be completely off base in my thinking. If I am, could someone just give me a 2013 version of the 'focal length = shutter speed' rule of thumb?

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