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Shutter Speeds
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Aug 16, 2017 08:23:45   #
JayHT Loc: NorthWest Washington
 
I find it impressive that today's cameras can achieve such high shutter speeds, but I wonder how accurate are these speeds. When cameras are represented to achieve speeds of 1/8000th of a second just how close do they get? Is it perhaps "close, but not quite" or are they 100% on spec? Are you aware of lab tests that verify the manufacturer's claims?

Regards,
JayHT

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Aug 16, 2017 08:34:06   #
RichardSM Loc: Back in Texas
 
JayHT wrote:
I find it impressive that today's cameras can achieve such high shutter speeds, but I wonder how accurate are these speeds. When cameras are represented to achieve speeds of 1/8000th of a second just how close do they get? Is it perhaps "close, but not quite" or are they 100% on spec? Are you aware of lab tests that verify the manufacturer's claims?

Regards,
JayHT


What you do not believe the manufactures? LOL
It's a good question you ask! For me I don't care that much I feel my Canon is actrate because the software I use in PP tells me and I use three of of them I don't believe all of them are incorrect? I know they all use the metadata file from the camera.

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Aug 16, 2017 08:47:11   #
BebuLamar
 
JayHT wrote:
I find it impressive that today's cameras can achieve such high shutter speeds, but I wonder how accurate are these speeds. When cameras are represented to achieve speeds of 1/8000th of a second just how close do they get? Is it perhaps "close, but not quite" or are they 100% on spec? Are you aware of lab tests that verify the manufacturer's claims?

Regards,
JayHT


With the electronic shutter? I believe they are very accurate. I wouldn't be surprised if they are off by less than 1%. With the mechanical shutter (the type most DSLR's have) I doubt that they are very accurate. I can't measure the shutter speed of a DSLR so I don't know. With film camera (they have pretty much the same kind of shutter) at the 1/8000 speed I am not surprised if they are 50% off. At 1 sec I would expect 1% off or so. At 1/125 I would expect 10%.

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Aug 16, 2017 08:49:05   #
cthahn
 
You should take your camera to one of these test labs and have them test and verify the shutter speed of your camera. Then let us all know the results. Then have all your lenses tested to make sure they all meet specifications and check the ISO readings also. If you are having exposure problems this might give you some answers. You will spent enough money to buy one more new cameras of your choice and you can start taking pictures.

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Aug 16, 2017 08:57:51   #
RichardSM Loc: Back in Texas
 
BebuLamar wrote:
With the electronic shutter? I believe they are very accurate. I wouldn't be surprised if they are off by less than 1%. With the mechanical shutter (the type most DSLR's have) I doubt that they are very accurate. I can't measure the shutter speed of a DSLR so I don't know. With film camera (they have pretty much the same kind of shutter) at the 1/8000 speed I am not surprised if they are 50% off. At 1 sec I would expect 1% off or so. At 1/125 I would expect 10%.


Actually I used a photodiode meter with analog camera shutters most of my own personal camera were spot on I built my own photometer I believe I still have it somewhere. Once in awhile I would get one a little off due to a slow shutter but was rectified easily, if it was with in less then +/- 1% it was good to go.

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Aug 16, 2017 09:31:57   #
BebuLamar
 
RichardSM wrote:
Actually I used a photodiode meter with analog camera shutters most of my own personal camera were spot on I built my own photometer I believe I still have it somewhere. Once in awhile I would get one a little off due to a slow shutter but was rectified easily, if it was with in less then +/- 1% it was good to go.


I have never seen a film camera shutter accurate to +/- 1%. Nikon tolerance for the Nikon F3 was 23% or about 1/3 stop.

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Aug 16, 2017 09:37:38   #
DavidPine Loc: Fredericksburg, TX
 
I'm pretty happy with 1/8000. The passing jets are at a combined speed of 1,000 mph.
JayHT wrote:
I find it impressive that today's cameras can achieve such high shutter speeds, but I wonder how accurate are these speeds. When cameras are represented to achieve speeds of 1/8000th of a second just how close do they get? Is it perhaps "close, but not quite" or are they 100% on spec? Are you aware of lab tests that verify the manufacturer's claims?

Regards,
JayHT


(Download)


(Download)

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Aug 16, 2017 10:27:43   #
dsmeltz Loc: Philadelphia
 
I timed mine. (Using an old egg timer) My 1/8000 was really only 1/7999!!! I was robbed!!!!

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Aug 16, 2017 12:15:00   #
GoofyNewfie Loc: Kansas City
 
dsmeltz wrote:
I timed mine. (Using an old egg timer) My 1/8000 was really only 1/7999!!! I was robbed!!!!

I'd sue them! LOL!!!

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Aug 16, 2017 12:23:18   #
BebuLamar
 
GoofyNewfie wrote:
I'd sue them! LOL!!!


They will tell you that they actually aimed for 1/8192 as the perfect value!

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Aug 16, 2017 12:25:49   #
dsmeltz Loc: Philadelphia
 
BebuLamar wrote:
They will tell you that they actually aimed for 1/8192 as the perfect value!


WHAT??!! 1/8192 (also know as .00012207) is my lucky number !!!! I have been looking for it everywhere!!

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Aug 16, 2017 12:29:28   #
BebuLamar
 
dsmeltz wrote:
WHAT??!! 1/8192 (also know as .00012207) is my lucky number !!!! I have been looking for it everywhere!!


You didn't know that? Camera shutter speed has been calibrated to 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096 and 8192 and not the numbers that it displays.

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Aug 16, 2017 12:32:53   #
MrBob Loc: lookout Mtn. NE Alabama
 
dsmeltz wrote:
I timed mine. (Using an old egg timer) My 1/8000 was really only 1/7999!!! I was robbed!!!!


Must play hell with your soft boiled eggs...

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Aug 17, 2017 00:15:40   #
rehess Loc: South Bend, Indiana, USA
 
JayHT wrote:
I find it impressive that today's cameras can achieve such high shutter speeds, but I wonder how accurate are these speeds. When cameras are represented to achieve speeds of 1/8000th of a second just how close do they get? Is it perhaps "close, but not quite" or are they 100% on spec? Are you aware of lab tests that verify the manufacturer's claims?

Regards,
JayHT

What matters for most of us is how does the system as a whole function? Are images, as a whole, neither too light or too dark? Can you trust the system to deliver reasonably exposed images?

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Aug 17, 2017 03:01:30   #
rook2c4 Loc: Philadelphia, PA USA
 
For the great majority of situations, a value near 100% accuracy will be sufficient enough such that the user will never notice the slight discrepancy.

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