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04-12-2012, 08:17 PM   #1
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Pentax DSLR Shutter Lag

How is it Pentax cameras have so much less shutter lag than Nikon and Canon cameras? It's almost 1/3rd the lag.

Perhaps this is another reason to prefer Pentax over the other two?

Does this mean taking pictures is much slower on the D7000, D300 etc..?

I know the D3 has slightly less shutter lag than the K-X.. but the k-x blows the D7000 away with respect to shutter lag.

Reason I am asking is that I have been tempted to switch to Nikon d7000 from k-x but if it is gonna be very slow taking pictures--i dunnoo... (One of the reason I've been upset at pentax lately is there is no new fast autofocusing lens you can buy in the 50mm range for under $300.)

04-12-2012, 08:38 PM   #2
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There's a DA50-1.8 prime on the way... Same price bracket as the DA35-2.4...

FA50-1.4 must come in under $300 used right?!
04-12-2012, 08:46 PM   #3
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Well to be perfectly honest shutter lag in DSLR are measured in milliseconds, and the diference between the K-x and the D7000 is a little over a 100ms. Unless you are planning to shoot sports it's really a non issue, and if you're shooting sports where miliseconds of shutter lag make a difference, then neither of these cameras are the way to go. Focus speed is more of an issue of how long it takes you to take a picture.
04-12-2012, 09:01 PM   #4
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K-X has 97ms of shutter lag and the D7000 has 238ms--so a difference of 141ms. I don't understand though, the D7000 supposedly shoots faster at 6fps vs. 4.7fps of the K-x.

How could the D7000 shoot 6 frames per second when the shutter lag is about 1/4 of a second?

04-12-2012, 09:21 PM   #5
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QuoteOriginally posted by geekette Quote
How could the D7000 shoot 6 frames per second when the shutter lag is about 1/4 of a second?
I think you've got you maths wrong...

QuoteOriginally posted by jase036 Quote
shutter lag in DSLR are measured in milliseconds
That's millionths of a second...

QuoteOriginally posted by jase036 Quote
it's really a non issue
As in... There's no way on Earth you'd notice in real life application...

QuoteOriginally posted by jase036 Quote
Focus speed is more of an issue of how long it takes you to take a picture.
As jase said... Focus speed is likely more of an issue in terms of speed and actually taking pictures...
I don't often notice slow focusing on my K-x... Don't worry about it... Go take some pictures...

Last edited by DaveHolmes; 04-12-2012 at 09:22 PM. Reason: mentalist cpu behaviour
04-12-2012, 09:29 PM   #6
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frames per second and shutter lag are two different things.
FPS is how fast the shutter/mirror moves and of course how much data can be transferred ect.
Shutter lag is the response time.
04-12-2012, 10:31 PM   #7
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A millisecond is 1/1000 of a second. 250 milliseconds is 1/4 of second. 238 milliseconds is about 1/4 of a second.

https://en.wikipedia.org/wiki/Millisecond

I figured shutter lag was the amount of time it takes for the mirror to go up and then return back to its original position.
04-13-2012, 05:07 AM   #8
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QuoteOriginally posted by geekette Quote
I figured shutter lag was the amount of time it takes for the mirror to go up and then return back to its original position.
No, shutter lag is the time the camera takes to respond to the shutter button being fully depressed (supposing you have already achieved focus lock or are in manual focus) and the time the shutter actually opens. So it would take the D7000 230ms to start a burst and then as long as you hold the shutter button down it would snap away at the specified FPS, same thing with the K-x.
The time it takes for the mirror to go up and back down is usually referred to as viewfinder blackout.

04-13-2012, 05:12 AM   #9
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Lag only effects the shutter button press. If it's set to continuous shooting, holding the shutter would fire at 6fps after the lag.
04-13-2012, 05:23 AM   #10
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A shutter lag difference of a 5th of a second is minor compared to the time difference of achieving focus. That could easily be half a second.
04-13-2012, 07:16 AM   #11
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QuoteOriginally posted by geekette Quote
K-X has 97ms of shutter lag and the D7000 has 238ms--so a difference of 141ms. I don't understand though, the D7000 supposedly shoots faster at 6fps vs. 4.7fps of the K-x.

How could the D7000 shoot 6 frames per second when the shutter lag is about 1/4 of a second?
shutter lag and the frame rate are two different things.

Maximum frame rate is simply limited by the mechanical aspects of the shutter, and the sweep time of the blades (note that this is not the same as the shutter speed) and the movement of the mirror, etc.

I say maximum frame rate, because obviously processing things like lens corrections, image resizing etc also take time, as does the transfer rate to the memory card. Case in point, lens correction jpeg processing limits the frame rate below maximum, on th eK7 and K5 maximum frame rate for continuous shooting is based on a 10MP image, higher resolution slows this down due to data transfer, lower resolution to processing time.

Shutter lag, is, the time it takes between pressing the button and taking the picture, While part of this time is the movement of the mirror and stopping down of the lens, it is not just that,
04-13-2012, 09:54 AM   #12
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Thanks for the clearing this up for me Now it makes a lot of sense what you all are saying.
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