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[Official] OCN Camera Thread - Page 852

post #8511 of 29549
Quote:
Originally Posted by Sun View Post
Stop down 4 times I believe. So 1/15?
Give a man a fish and he will eat for a day. Teach a man to fish and he will eat for a lifetime.
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post #8512 of 29549
Quote:
Originally Posted by theCanadian View Post
Give a man a fish and he will eat for a day. Teach a man to fish and he will eat for a lifetime.
told me all I know.

ISO "steps" 100, 200, 400, 800, 1600... (doubles)

ISO is sensitivity to light, so if you move from ISO 100 to ISO 200, the camera is twice as sensitive to light, requiring half the shutter speed.

To go from ISO 1600 to 100, I "stepped" 4 times down the scale. This means at the same aperture value, you decrease your shutter speed four steps.

1/125, 1/60, 1/30, 1/15

Aperture follows a similar pattern. f/4, f/5.6, f/8, f/11 are full stops.

EDIT: Here is a slightly condensed version of his explanation.
Edited by Sun - 9/22/10 at 4:41pm
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post #8513 of 29549
1/15.625

I have no idea if this is right, just my assumption..

ISO 1600 lets in 16x more light than ISO 100.

1/250 * 16 = 0.064
1 / 0.064 = 1/15.56 of a second
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post #8514 of 29549
Nice. I made myself a nice chart. Might try a long exposure tonight. Obviously this math doesn't apply to life so cleanly. But it's ball park math to begin with so...
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post #8515 of 29549
Quote:
Originally Posted by Marin View Post
Pentax needs to learn how to market their stuff first.




With the Sigma, yes and no. It's 46mp due to the three layers of the Foveon sensor but for actual resolution it's around 15mp.
pentax first need the product to be on the market, before they can market it.


i know the sigma is a bit of a marketing gimmick. but it is suppose to give you 3 times the "resolution" of color since theres no bayer matrix.
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post #8516 of 29549
Quote:
Originally Posted by theCanadian View Post
Nice. I made myself a nice chart. Might try a long exposure tonight. Obviously this math doesn't apply to life so cleanly. But it's ball park math to begin with so...
:O Wanna post the chart? I'd love it!
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post #8517 of 29549
Quote:
Originally Posted by iandroo888 View Post
how much for sb600? *cough* discount for ocn? xD *cough*
Any discount I give will probably get slaughtered by import taxes and shipping fees.

Quote:
Originally Posted by dudemanppl View Post
Buy a monopod, umbrella, and a flash bracket. Use the SB800 off camera. You shall have much fun.
I was thinking about it, but I'm not that interested in portraits.

I was thinking of working my way down this list;
SB-400
Tokina 11-16
Nikon 70-200
Nikon 2x tc
    
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post #8518 of 29549
"And if you want to join the club, post saying you want to join and tell us what camera and equipment you use"

Camera I Use is a Nikon D90 with various Glass.

Not a pro by any means, but love to take photos.

Have owned it since October 2008
    
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post #8519 of 29549
Quote:
Originally Posted by Shane1244 View Post
:O Wanna post the chart? I'd love it!
It's really only useful if it's in your camera bag but sure. These are full stops only. I have these on a piece of paper in columns next to each other. Makes it easier to 'stop up' and 'stop down' correctly.

I really don't see why you'd need this if you shoot with a camera that can already do 30s exposures. I'm stuck at 4s. Even then I'd probably only use it rarely.

For example:
I take a light reading at night with an ISO value of 1600 and an aperture of f/4. My camera spits out a value of 1/15s. But I have a roll of ISO 100 in and I want to shoot at f/11. I can use this chart to determine that I must expose the film for approximately 8 seconds at f/11 to obtain a correct exposure with ISO 100 film. From there I can put my camera in manual shutter mode and use a stop watch to approximate the correct length of exposure.

F-stops
f/1
f/1.4
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16
f/22
f/32

ISO Stops
25
50
100
200
400
800
1600
3200
6400

Shutter Stops
30s
15s
8s
4s
2s
1s
1/2s
1/4s
1/8s
1/15s
1/30s
1/60s
1/125s
1/250s
1/500s
1/1000s
1/2000s
1/4000s
Edited by theCanadian - 9/22/10 at 7:03pm
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post #8520 of 29549
Quote:
Originally Posted by Shane1244 View Post
:O Wanna post the chart? I'd love it!
you shoot digital right?

just hit AEL then adjust away....


Quote:
Originally Posted by theCanadian View Post
It's really only useful if it's in your camera bag but sure. These are full stops only. I have these on a piece of paper in columns next to each other. Makes it easier to 'stop up' and 'stop down' correctly.

I really don't see why you'd need this if you shoot with a camera that can already do 30s exposures. I'm stuck at 4s. Even then I'd probably only use it rarely.

For example:
I take a light reading at night with an ISO value of 1600 and an aperture of f/4. My camera spits out a value of 1/15s. But I have a roll of ISO 100 in and I want to shoot at f/11. I can use this chart to determine that I must expose the film for approximately 8 seconds at f/11 to obtain a correct exposure with ISO 100 film. From there I can put my camera in manual shutter mode and use a stop watch to approximate the correct length of exposure.
does your in body meter not work?
Edited by mz-n10 - 9/22/10 at 9:00pm
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