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03-04-2012, 10:11 AM   #46
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Ron, I don't quite understand why TV?
I will try it though.

03-04-2012, 10:51 AM   #47
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OK Ron, I took a few test shots on TV. They look pretty much like the last two (non-moving) batches of test shots that I shot on full manual, although I am still not really clear on what I should be looking for.
03-04-2012, 10:57 AM   #48
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@Philoslophical, K105mm prime on the car pictures, DA16-45 in the rest of them
03-04-2012, 11:06 AM   #49
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With greater than 3 stops difference between 1/1250 and 1/6000 I would definitely expect more difference. That seems obvious. Curious indeed.

03-04-2012, 11:33 AM   #50
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QuoteOriginally posted by NeatKnight Quote
OK Ron, I took a few test shots on TV. They look pretty much like the last two (non-moving) batches of test shots that I shot on full manual, although I am still not really clear on what I should be looking for.
Investigate if 1/2500th is a shorter shutterspeed then 1/25 or 1/250th. If you want to know if your camera is working proparly on shutterspeed, then that is the thing to keep control over.
03-04-2012, 03:47 PM   #51
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I tried Rons idea of spinning a coin on a table (actually I used a casino chip) and what I found, unfortunately is that no shutter speed on the k-x consistently stops the motion. Although my P & S stops it dead at 1/1600. Fortunately, 1/1250 is enough 99% of the time and the k-x is still a great camera even without the higher speeds.
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03-04-2012, 03:58 PM   #52
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Well, if it is the shutter not working properly, you should get it serviced. If it's a hardware problem, it's liable to get worse over time.
03-05-2012, 12:16 PM   #53
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QuoteOriginally posted by NeatKnight Quote
I tried Rons idea of spinning a coin on a table (actually I used a casino chip) and what I found, unfortunately is that no shutter speed on the k-x consistently stops the motion. Although my P & S stops it dead at 1/1600. Fortunately, 1/1250 is enough 99% of the time and the k-x is still a great camera even without the higher speeds.
wow that is a pitty. Can you see a difference between 1/100th -> 1/250th -> 1/1000th? So any idea where your camera starts to fail? If the camera is out of warrenty I don't think it is worth the cost of repair.

03-05-2012, 02:01 PM   #54
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Yes, I can definitely see the difference between 1/100 and 1/250. It isn't starting to fail until at least 1/1000 (which is enough most of the time). But at least now that I know that there's a problem I won't miss shots by attempting higher speeds when I could have just as easily changed the ISO. I will probably eventually get a k-5 anyway so I just hope the problem doesn't get worse before I can get it.
03-05-2012, 02:49 PM   #55
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QuoteOriginally posted by NeatKnight Quote
I tried Rons idea of spinning a coin on a table (actually I used a casino chip) and what I found, unfortunately is that no shutter speed on the k-x consistently stops the motion. Although my P & S stops it dead at 1/1600. Fortunately, 1/1250 is enough 99% of the time and the k-x is still a great camera even without the higher speeds.
What were the exif figures for your p&s with 1/1600? Because the exif figures from that picture don't make sense. I tried those numbers and pointed the camera directly at a bulb (2 inches from lens) and still got 3+ stops under. Have you tried cleaning your contacts - lens and camera mount?
03-05-2012, 04:52 PM   #56
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QuoteOriginally posted by DreTAX Quote
What were the exif figures for your p&s with 1/1600? Because the exif figures from that picture don't make sense. I tried those numbers and pointed the camera directly at a bulb (2 inches from lens) and still got 3+ stops under. Have you tried cleaning your contacts - lens and camera mount?
I agree....something doesn't seem right. If you look here: Photographic Exposure Calculator for Available Light and set the setting to Bright Interior and ISO 1600, the correct exposure time for f/13 is around 1/20 of a second....???
03-05-2012, 07:16 PM   #57
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The P&S was on f/2, ISO 3200,1/1600. (Which looks just a bit overexposed).
03-05-2012, 08:00 PM   #58
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Rather than spin a coin, which is hard to do consistently, spin a wheel, put something on a turntable, or even switch on a fan. Then put a nice strong light on it, get it spinning at a constant speed, and photograph it at a variety of shutter speeds using Tv, including at 1/6000.

That should give you a clearer idea of whether your high shutter speeds are working.

Last edited by rawr; 03-05-2012 at 08:27 PM.
03-07-2012, 12:56 AM   #59
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QuoteOriginally posted by rawr Quote
Rather than spin a coin, which is hard to do consistently, spin a wheel, put something on a turntable, or even switch on a fan. Then put a nice strong light on it, get it spinning at a constant speed, and photograph it at a variety of shutter speeds using Tv, including at 1/6000.

That should give you a clearer idea of whether your high shutter speeds are working.
I did a similar trick with a fan. I taped a red piece of paper on one of the blades and took photos of it, fans would most likely spin at a more consistent speed so its a better test subject.
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