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Author Topic: 5d3/6d silent shutter: faster, slower or equal wear?  (Read 14261 times)

duydaniel

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #15 on: September 28, 2013, 01:21:57 AM »
Yes I think that too
different shutter speed only means different distance between 2 "blades"
higher speed means less space/distance between the 2 blades.

Here is a link about vibration
http://joema.smugmug.com/Photography/5D-Mark-III-Shutter-Vibration/22428944_crqXn5#!i=1793066118&k=HtGf99t

Hi.
My understanding of the shutter speeds is that the curtains travel at a fixed speed. The first curtain departs at x metres per second, then 1/250 or 1/8000 of a second the second shutter departs also at x m/s. At 1/250 being max flash sync on most of our bodies (if my memory serves me well) this is the highest shutter speed where the first curtain arrives before or as the second curtain departs. I.e. the whole sensor is uncovered. All speeds over this the second shutter departs before the first arrives at the far side. The shutters do not travel faster, just the slit that crosses the sensor "exposing" it is narrower. At 1/8000 of a second it is very narrow!

My understanding is that it is also the slit with fixed speed curtains that determine flash sync as above that speed only a small portion of the sensor would recieve the light from the flash, this is without a flash capable of high speed sync which is a burst of less powerful flashes not one strong flash.

I do not know from this whether continued use of a 1/8000 shutter speed would cause any more wear than a 1 second exposure, I would doubt it from basic inertia principles though there may be other factors to take in to account.

Hope this helps.

Cheers Graham.

Shutter can fail for many reasons, certainly speed is a big factor.  Using one at 1/8000 sec all the time will cause it to fail sooner with all other things being equal.

Just curious: why? Is there something special about 1/8000?

From all the "slow mo" videos I've seen of shutters, the speed of the curtains down the plane is the same, the only difference between shutter speeds is the amount of time delay between the 1st curtain being activated and the 2nd.

Does the camera drive the curtains harder for 1/8000s?

Thanks, TTYL
« Last Edit: September 28, 2013, 01:26:54 AM by duydaniel »

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #15 on: September 28, 2013, 01:21:57 AM »

Marsu42

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #16 on: September 28, 2013, 03:43:14 AM »
At 1/250 being max flash sync on most of our bodies (if my memory serves me well)

You wish - only 60d/7d/1dx have 1/250s, the rest afaik 1/200s and the 60d is limited to only 1/180s - which again begs the (unanswerable) question if this is due to intentional crippling or a safety factor because of a cheaper design. Btw the original 1d managed 1/500s...

Valvebounce

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #17 on: September 28, 2013, 02:59:23 PM »
Hi Marsu. I did check the 3 cameras that I have access to. 20D 40D and 7D and all have 1/250 sec flash sync in av mode, which I may have been mistaken in calling max flash sync.

Cheers Graham.


At 1/250 being max flash sync on most of our bodies (if my memory serves me well)

You wish - only 60d/7d/1dx have 1/250s, the rest afaik 1/200s and the 60d is limited to only 1/180s - which again begs the (unanswerable) question if this is due to intentional crippling or a safety factor because of a cheaper design. Btw the original 1d managed 1/500s...
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Marsu42

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #18 on: September 28, 2013, 03:18:27 PM »
Hi Marsu. I did check the 3 cameras that I have access to. 20D 40D and 7D and all have 1/250 sec flash sync in av mode, which I may have been mistaken in calling max flash sync.

You can also check this on Canons site - but all you bodies you looked at aren't Rebels, but are/were the premium crop bodies, that's why they've got the fastest available x-sync. Btw on crop it's easier to get a faster x-sync than full frame, because the curtains have to move a shorter distance so keeping the whole frame open for a short period is easier.

Valvebounce

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #19 on: September 28, 2013, 05:08:01 PM »
Hi Marsu,
I did look at my rebel, 300D, it has no selection options in the menu, and as the hand book is not on my iPad I didn't look it up! ::)
I guess we are both right and both wrong together.  ;D
Does the av sync count as max sync speed? I did not look at the manuals, only the menus, so I don't know the stated numbers.

Cheers Graham.

Hi Marsu. I did check the 3 cameras that I have access to. 20D 40D and 7D and all have 1/250 sec flash sync in av mode, which I may have been mistaken in calling max flash sync.

You can also check this on Canons site - but all you bodies you looked at aren't Rebels, but are/were the premium crop bodies, that's why they've got the fastest available x-sync. Btw on crop it's easier to get a faster x-sync than full frame, because the curtains have to move a shorter distance so keeping the whole frame open for a short period is easier.
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Marsu42

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #20 on: September 28, 2013, 05:45:44 PM »
Does the av sync count as max sync speed?

The Flash x-sync speed is the same in all modes, p/tv/av/m/... and inside our outside live view :-) ... it's just that Av usually has a dedicated option to force the shutter to stay inside sync speed.

Valvebounce

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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #21 on: September 28, 2013, 06:49:12 PM »
Does the av sync count as max sync speed?

The Flash x-sync speed is the same in all modes, p/tv/av/m/... and inside our outside live view :-) ... it's just that Av usually has a dedicated option to force the shutter to stay inside sync speed.

Hi Marsu.
Thanks for clearing up that point, I thought that was the case, but started to doubt myself after you queried the speeds I thought I knew!

Cheers. Graham.
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Re: 5d3/6d silent shutter: faster, slower or equal wear?
« Reply #21 on: September 28, 2013, 06:49:12 PM »