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07/08/2008 09:16:30 AM · #1 |
Hello Fellow Experts,
Yesterday I came across a very interesting comment in a Photo Retouching video I found at the following web site : //www.digitalphotoshopretouching.com. On the Tutorial page there is a 5 minute video where the photographer uses a Canon G9 Point & Shoot ($350), instead of his Hassleblad H3D-39 ($35,000) or his Canon 5D ($3,000). He attaches an Alien Bees flash to the hotshoe and then makes this incredible statement ...
"One of the beauties of the point & shoot camera is that is uses a leaf-shutter and can sync flash at any speed, even at 1/2000 of a second..." He is taking the photoshoot at F5, 80 ISO and 1/2000 sec with the Canon G9.
Here's my questions. First of all, the Canon G9 specs at dpreview says it has the flash option to do a rear curtain sync. If that is true, then is it really using a leaf-shutter? Secondly, why can a leaf-shutter sync flash at 1/2000 of a second but a more sophisticated dslr like my Nikon D300 with curtain and/or electronic shutter not do that?
Any feedback would be greatly appreciated.
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07/08/2008 10:56:49 AM · #2 |
The G9 may have an electronic shutter.
I think most mechanical leaf shutters max out at 1/500, but that's based on my experiece with Copal shutters on view cameras. And they're really more appropriately termed diaphragm shutters, but almost everyone calls them a leaf shutter.
He is right though about the leaf shutter having higher sync speeds though.
Message edited by author 2008-07-08 10:57:56. |
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07/08/2008 11:31:37 AM · #3 |
The reason that the leaf/diaphragm shutter can sync at higher speeds, is due to the way they operatte.
The curtain shutter opens and is followed by a closing element. At high speeds the sensor is never completely uncovered. The closing element starts travelling before the opening element is fully open, so when the flash goes off, part of the sensor is covered.
The leaf/diaphragm shutter acts like the iris on the lens, it opens outwards from the center, and then recloses. So, the entire sensor sees the the light all at once. Thus this shutter can sync at about any speed it can produce.
-alex
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07/08/2008 12:30:35 PM · #4 |
| the G9 is a digital P&S and is not really using a shutter. instead the sensor is always open and is using an electronic "Shutter" as for the fast sync you can get a faster sync on a hotshoe flash IF your using a Canon flash or a Nikon flash other units according to them are not fully known to them so th fastest they will sync is 1/125 and seems more of a way to try to get ppl to buy the Canon/Nikon name brand equipment instead of 3rd party equipment. |
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07/08/2008 12:41:41 PM · #5 |
Originally posted by nemesise1977:
the G9 is a digital P&S and is not really using a shutter. instead the sensor is always open and is using an electronic "Shutter" as for the fast sync you can get a faster sync on a hotshoe flash IF your using a Canon flash or a Nikon flash other units according to them are not fully known to them so th fastest they will sync is 1/125 and seems more of a way to try to get ppl to buy the Canon/Nikon name brand equipment instead of 3rd party equipment. |
Actually, it has to do with the fact that Canon/Nikon know the pulse duration of their flash units and can account for that with their own camera while they cannot control that for thrid party units. |
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07/08/2008 01:09:17 PM · #6 |
| Thanks everyone for the great comments. I have learned a lot from this exercise. |
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07/09/2008 10:40:13 AM · #7 |
Originally posted by Spazmo99:
Originally posted by nemesise1977:
the G9 is a digital P&S and is not really using a shutter. instead the sensor is always open and is using an electronic "Shutter" as for the fast sync you can get a faster sync on a hotshoe flash IF your using a Canon flash or a Nikon flash other units according to them are not fully known to them so th fastest they will sync is 1/125 and seems more of a way to try to get ppl to buy the Canon/Nikon name brand equipment instead of 3rd party equipment. |
Actually, it has to do with the fact that Canon/Nikon know the pulse duration of their flash units and can account for that with their own camera while they cannot control that for thrid party units. |
Is that rating just for the G9? I know the DSLR's are rated with an x sync across the board for all flashes.
The original 1D, Nikon d40, d50, and d70 will "sync" up to their maximum shutter speed as well. They're all using CCD sensor that are electronically controlled. |
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