Am I relying on SSS too much?

Started Jul 20, 2013 | Questions thread
cplunk Senior Member • Posts: 1,834
Re: Am I relying on SSS too much?

TFSJake wrote:

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?

The 50mm = 1/50 sec shutter speed is based on the "amplification" of the movement of the image on the sensor based on the distance between the lens's focal point and the sensor.

This distance does not change with a smaller sensor, it's still 50mm. And the same amount of camera movement would make the same amount of "shake" in the image.

But this rule, I think it's the best rule of thumb, I think it's a bit of a safety measure for the film days. I'm pretty sure, even without SSS on, I can generally get a bit slower in most conditions. It's when carrying a heavy bag, getting tired, etc that people can get a lot shakier without really noticing, and becomes a good time to follow this rule.

But really, even 1/50 is pretty slow. Stop trying to keep it at ISO 100 all the time. Going up to ISO 400 you probably won't see much, if any difference in quality.

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