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New Contributor
Posts: 1
Registered: ‎10-22-2014

1/60 vs, 1/64

When I set the speed on my Canon 1Ds Mark III to 1/60 sec., I see a speed of 1/64 sec in the file.  

1.  Why is this?

2.  When will the problem be fixed?

3.  Which of the two values is the true speed?

 

Gudehus

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Respected Contributor
Posts: 1,735
Registered: ‎02-28-2013

Re: 1/60 vs, 1/64

1) Shutter speeds are rounded off to make them easier to say, remember, calculate halves, etc.  The true shutter speeds would be 1/2^x

 

1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512, 1/1024, ...

 

I'd guess that 1/60 is probably within the accuracy of the shutter at 1/64.

 

2) It won't be fixed.  Though I might ask, why is it a problem?  How has it affected your photography?

 

3) 1/64 is the nominal speed for 6 stops below a 1 second shutter speed.

VIP
Posts: 11,533
Registered: ‎12-07-2012

Re: 1/60 vs, 1/64

1.  Why is this?

2.  When will the problem be fixed?

3.  Which of the two values is the true speed?

 

 

1.   I have no idea!  I have shot a 1Ds Mk III for a long time and have never seen this or at least I never noticed it.

2.   It isn't a problem anyway so there will be no fix.  The main reason is the 1Ds Mk III is a discontinued camera and will not likely recieve any updates.

3.  Really?  You can tell 1/60 from 1/64?

EOS 1DX and 1D Mk IV and several lenses!
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