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Old Oct 24, 2004, 6:01 PM   #1
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I like to take pictures of birds. They tend to move a lot, so it helps to have a fast shutter speed, especially when using a teleconverter at highest zoom.

If you check out the charts on p. 55 of the manual, the 1/2000 shutter speed only works with an F8 f-stop. What good is that? The faster the shutter speed, the more light you need to let in to get a properly exposed picture.

Based on the charts, the only fast "usable" shutter speed is 1/1000, if you want to take advantage of the "fast" F2.8 lens and use all f-stops available.

The 1/2000 shutter speed appears to be nothing more than a sales gimmick, as I can't think of any subject, other than the sun, perhaps, which would require an F8-1/2000 combo for proper exposure.

As a challenge, perhaps, someone can post a picture taken with this camera at the 1/2000 shutter speed. If the manual is correct, and not a misprint, I think it would be impossible to find a subject bright enough.

Jim
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Old Oct 24, 2004, 6:40 PM   #2
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I know this doesn't help you any but... I believe the shutter simply closes the diaphram down to nothing. When it is almost closed it closes faster. The spec simply relates this fact.
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Old Oct 24, 2004, 7:11 PM   #3
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No reason for that indeed.
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Old Oct 24, 2004, 8:26 PM   #4
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Where does that leave using a 35mm slr with a speed of 1/4,000th then, but they are there. So is 1/8,000th sec if memory sereves me right. Now using a 400mm F/2.8 from Canon would set us back what in $ terms, never mind the weight and size :-)

The only silly thing then is the need for F/8, not fun to try at 1/2000th

Danny.

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Old Oct 24, 2004, 10:06 PM   #5
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Fast shutter speeds are great for stopping action, but only if you can open up the lens to get proper exposure. That's how all cameras are supposed to work. I imagine the SLR digitals work this way.

Here's an example, which will make sense to those who've had experience with manual film cameras. The rule of thumb at ISO 400, assuming you didn't have a light meter, would be to set the camera at 1/500 second at F16 for proper exposure in bright sunlight. At 1/1000 second, you would set the aperture at F11. At 1/2000, you wouldbe at F8, still okay. Hmmm, I seemed to have answered my own question. The fastest usable shutter speed appears to be 1/2000, which isn't too bad if you're shooting brightly lit subjects and don't mind noisy pictures. However, if you're in partial shade, you're out of luck. If you need 1/500 at F8 for proper exposure, you would need 1/1000 with F5.6 and 1/2000 with F4. The camera won't permit this last setting, which seems kind of weird.

In conclusion, the FZ20 will approach the 1/2000 shutter speed if the ISO is set at 400 and the subject is brightly lit by the sun. If you want to use a fast shutter speed at a slower ISO setting, it won't work.
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Old Oct 24, 2004, 10:15 PM   #6
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Here is a reason. I took 2 pictures of a window fan (a dirty one). The fan was on full speed. In both shots the fan blades have no motion blurr.

The first shot was taken at f2.8, 1/1000

The second was taken at f8.0, 1/2000

If the fan was rotating enough to cause motion blurr at 1/1000, but not at 1/2000, there would be a use for this.

The ISO was set to 100 for both shots, and there may also be uses for this when using higher ISO settings as well.

It's the only big zoom out there (so far) that offers an f2.8 through out the range, but common... somethings gotta give.

bobc

1 f2.8, 1/1000


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Old Oct 24, 2004, 10:16 PM   #7
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2 f8.0, 1/2000


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Old Oct 24, 2004, 11:21 PM   #8
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Bob, your little photographic experiment defies everything I know about photography. F8at 1/2000 does not equate to F2.8at 1/1000 at ISO 100setting and the same lighting conditions. It doesn't make any sense.

Assuming F8 at 1/2000 is correct, the correct exposure at 1/1000 would be F11, not F2.8. These exposures don't make any sense at ISO 100. What are you smoking?

:?
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Old Oct 24, 2004, 11:25 PM   #9
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Oh, by the way, using flash negates all experiments, as the speed of the strobe determines whether action is stopped or not, not the shutter speed or ISO setting. If you used flash, your results don't mean anything.
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Old Oct 24, 2004, 11:42 PM   #10
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JimBailey wrote:
Quote:
Bob, your little photographic experiment defies everything I know about photography. F8at 1/2000 does not equate to F2.8at 1/1000 at ISO 100setting and the same lighting conditions. It doesn't make any sense.

Assuming F8 at 1/2000 is correct, the correct exposure at 1/1000 would be F11, not F2.8. These exposures don't make any sense at ISO 100. What are you smoking?

:?
There is no need for insults. I am just a beginner in all this stuff. I did not know about the flash stopping the action. I was just trying to use a little common sense with the little knowledge that I have to try and help out.

I am sorry for being such an idiot.

bobc
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