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05-08-2008, 06:06 PM   #1
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How does burst on K20D work mechanically?

The mirror locks up but we still need a shutter. Can't believe the shutter is going 20+ fps. How is Pentax doing this? After shooting a burst it takes a long time for the orange light to stop blinking. What are they doing?
inquiring minds.
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barondla

05-08-2008, 06:32 PM   #2
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The burst mode images are taken from the Live View and fed through the JPEG engine. The shutter is NOT operating at 22 FPS.
In burst mode, the mirror locks up, the shutter opens, and the Live View feeds its output to the JPEG file converter/writer.
You can cut down on the time the write light stays on by using a fast card such as a Sandisk Extreme III.
05-11-2008, 10:48 AM   #3
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QuoteOriginally posted by Wheatfield Quote
The burst mode images are taken from the Live View and fed through the JPEG engine. The shutter is NOT operating at 22 FPS.
In burst mode, the mirror locks up, the shutter opens, and the Live View feeds its output to the JPEG file converter/writer.
You can cut down on the time the write light stays on by using a fast card such as a Sandisk Extreme III.
Does that mean that during this burst you have VF blackout?
05-11-2008, 10:58 AM   #4
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QuoteOriginally posted by axl Quote
Does that mean that during this burst you have VF blackout?
Yes. When you are in burst mode, the camera uses an electronic shutter similar to the ones used in P&S cameras.

05-11-2008, 11:15 AM   #5
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oh I thought the beauty of the mechanical shutter was that there is less stuff on the sensor improving image quality though i suppose a APS-c sensor size can hold all of that and do decent images although with increased use of gear on the sensor there will be more heat and noise
05-11-2008, 12:30 PM   #6
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Nikon D70 had electronic shutter (along with mechanical) this allowed it to have a 500s flash sync speed. Wonder why we don't have that ability? Even in live view a high flash sync (without resorting to HS flash mode) would be useful.
thanks
barondla
05-11-2008, 05:14 PM   #7
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QuoteOriginally posted by barondla Quote
Nikon D70 had electronic shutter (along with mechanical) this allowed it to have a 500s flash sync speed. Wonder why we don't have that ability? Even in live view a high flash sync (without resorting to HS flash mode) would be useful.
thanks
barondla
The D70 could go well beyond 1/500 because of this.

I would love to see Pentax offer this as an option. (I can see disabling it by default for quality reasons.) It's obviously technically feasible to do electronic shutter since it's used for burst - This feature would be WONDERFUL for trying to balance flash and ambient outdoors.

Yeah, I know Pentax would want to sell more HSS P-TTL flashes like the AF-540, but since HSS acts like a continuous light, exposure goes down as shutter speed increases, unlike non-HSS flash.
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