Blurry Pictures...

[nuruls]

A rule of thumb for handholding is to use a shutter speed that is 1/lens focal length or faster. In other words, if you're shooting a 200mm lens, you need 1/200th second or faster.

My question is... if I'm using Tamron 17-50mm f2.8 and actually is equivalent to 26-78mm for dSLR, what is the CORRECT minimum shutter speed while at 50mm? 1/60sec or 1/90sec? Must I compensate if shoot digitally to the the equivalent focal length?

Thanks in advance. I really confused about this matter.

[derickuan]

Rule of thumb for film : 1/focal length

Rule of thumb for digital : 1/(focal length X crop factor for digital camera)

So for 50mm in digital, say you have Nikon DX DSLRs which have crop factor of 1.5,

the minimum shutter speed is 1/(50x1.5) or 1/75sec.

So for your case, 1/60 is still a bit risky whereas 1/90sec should be ideal.


However, if you trained your hand and grip nicely....hehe...you still can get away sometimes with lower shutter speed than that.

Anyway, it's just a rule of thumb.....when you are force to a corner...sometimes you will just take the risk when lighting is really not at your side.

My 1/250 sens

[ShaolinTiger]

DK is correct, it's equivalent focal length, not actual focal length on crop sensor.

So it's focal length x 1.6 or 1.5.

You can go lower though, it's just a rule of thumb for those with undsteady hands.

I can often go down to 1/15 or 1/10 without much problem on a 17mm lens (24mm equiv).

[N.Keong]

but then with flash... the shutter speed can go lower as well rite ?
hehhehehe...

I've been trying and learning to use something like 1/30.. hehehe...
but indoor / low light, I start from 1/60.

Am I doing it correct ? Like I said... still learning...