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# [Official] OCN Camera Thread - Page 1057

Any physics enthusiasts in here?

The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of a 775 ÂµF capacitor is 330 V.

(a) Determine the energy that is used to produce the flash in this unit.

(b) Assuming that the flash lasts for 5.0*10^-3 s, find the effective power or "wattage" of the flash.

So far:
Coulumbs=0.25575C

Now here I'm not sure what to do next.

But I push on:
1A=1C/s

So:
0.25575C/5x10^-3s=51.15A

P=IV

P=51.15A*330V=16879.5W

But, that answer is kicked backed as wrong, and I'm not quite sure how to go about part A if part B is wrong.

Otherwise I would have just converted watt*hours to joules.
Edited by theCanadian - 2/24/11 at 7:26pm
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### Gear mentioned in this thread:

Got the 50D's menus and buttons set up how I like them (for now) -- it's typically very dim in my house, so I took that as an opportunity to try some of the higher ISO settings. Not sure how I feel about shooting above 2000, as the images do get quite noisy and have a trashy white speckling to them. In time, with more shots, I'm sure I can learn to deal with it more in PP, but for now I'm just interested in learning what the images look like straight out of the camera.

Here's an example, 85mm f/1.8, 1/100 ISO 3200:

I wish my hands were a bit more steady, this was a lucky shot, haha.
Quote:
 Originally Posted by sub50hz Got the 50D's menus and buttons set up how I like them (for now) -- it's typically very dim in my house, so I took that as an opportunity to try some of the higher ISO settings. Not sure how I feel about shooting above 2000, as the images do get quite noisy and have a trashy white speckling to them. In time, with more shots, I'm sure I can learn to deal with it more in PP, but for now I'm just interested in learning what the images look like straight out of the camera. Here's an example, 85mm f/1.8, 1/100 ISO 3200: I wish my hands were a bit more steady, this was a lucky shot, haha.
Nice for a ISO 3200 shot Obviously not the best blown up, but at the resized res it looks like a great pic.

And just a few suggestions for your 50D:
• Back Button AF (Absolute love!)
• Set C1 and C2 settings according to unusual yet common forms of photography you do (My C1 is set to sports, C2 set to low light)
Thanks for the tips! I'm gonna wait until I get my "most used" settings dialed in a bit more to set the C1 and C2 profiles, but I've got the My Menu set up as follows:

-Exposure Comp/AEB
-Highlight Tone Priority (this is temporary until I can see if it's worth using)
-White Balance
-Custom WB
-Flash Control

I've also set up the joystick for AF points, which is a HUGE improvement from the Rebels' implementation.
Quote:
 Originally Posted by sub50hz Thanks for the tips! I'm gonna wait until I get my "most used" settings dialed in a bit more to set the C1 and C2 profiles, but I've got the My Menu set up as follows: -Exposure Comp/AEB -Highlight Tone Priority (this is temporary until I can see if it's worth using) -White Balance -Custom WB -Highlight Alert -Flash Control I've also set up the joystick for AF points, which is a HUGE improvement from the Rebels' implementation.
Definitely

The way I look at it, going from a Rebel to an xxD camera, the extra features are a "want" more than a "need, but once you get accustomed to those extra features, they become a need that you can't live without.
Well, for me, the high-ISO settings, better AF, continuous RAW shooting speed and ergonomics were more needs than wants (ok, ergonomics might fall more under the want category, lol). Now if it would hurry up and turn to spring, I could go get some good action shots and test the effectiveness of the AF in AI Servo. Hard to do in the house.
This and the 24G are the only lenses I'll ever need. My life is now complete.

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Dream Killer, what gear do you have? On the front page it says XTi, 17-55 IS, and 70-200 f/4 IS. I assume thats changed...
 POTATO (14 items)
 POTATO (14 items)
Yeah, I switched over to Nikon because I'm tired of waiting for Canon's answer to the D700. Canon will never do one because there will never be a full-frame 7D to prevent a challenge to the 1Ds and 5D line. I also find Nikon's ergonomics to be superior by leaps and bounds.

The only Canon gear I have left is the XTi, the 1Ds MK2, 70-200 F/4 IS, 35 1.4, 85 1.2 and a 580ex II. I also have a gigantic (and mostly useless now) 200 F/2 IS that no one wants to buy. I'm probably going to end up e-baying them but I don't want deal with the double paypal/ebay seller fee.

EDIT:
Current gear is a D700, 24mm 1.4g, 16-35 f/4 VR, SB-700. Probably going to get a 70-200 VR2 or an 85 1.4g next week.
Edited by Dream Killer - 2/24/11 at 10:34pm
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42 joules
.20 watts
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