Guideline for shutter speed

[psychedelic_never]

Hi all,
I was just wondering about the guideline about handheld shutter speed is preferred to be 1/focal length. Now is that focal length the actual focal length or the the focal length you get after multiplying by 1.6 on the DRebel.
Sorry if that seems to be a silly question, but this is something i really was wondering about for long.... before i joined the forum... :)

Thanks

[Belmondo]

Effective focal lenth (X1.6)

[Olegis]

Effective focal lenth (X1.6)

Doesn't the magnification of the lens stay the same as with full frame body ? Correct me if I'm wrong, but I always thought that the camera shake is "amplified" with the lens "real" magnification, so 1/focal length rule will be sufficient.

[Belmondo]

Effective focal lenth (X1.6)

Doesn't the magnification of the lens stay the same as with full frame body ? Correct me if I'm wrong, but I always thought that the camera shake is "amplified" with the lens "real" magnification, so 1/focal length rule will be sufficient.

The lens magnification is the same regardless of body, so the actual amount of shake at the sensor is also the same. What's different is that with the smaller sensor, an equal amount of shake translates into a greater percentage of the recorded image, so the effect is amplified.

[Olegis]

I see. Thanks Tom :)

[gillyworld]

So is what you are saying, a 200mm lens has a rule of thumb that says 1/200th of a second will get a sharp picture, with a 1.6x digital using the same lens then we should be looking at 1/320th of a second to get a similar result?

[aam1234]

yes gillyworld.