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exposure question
May 8, 2014 16:10:07 #
I was watching a how to video demo where the camera was set to take three pictures one normal, then one underexposed one stop and then one overexposed one stop just by hitting the shutter button three times. Can anyone tell me the correct term for this function and/or if a Canon EOS t3 has this capability?
Thanks
Rob
Thanks
Rob
May 8, 2014 16:11:31 #
Exposure bracketing.
I think most cameras have that option...very useful for things like HDR.
Instructions for the T3 Here
I think most cameras have that option...very useful for things like HDR.
Instructions for the T3 Here
May 8, 2014 16:33:40 #
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May 8, 2014 18:05:06 #
May 8, 2014 18:28:25 #
amehta
Loc: Boston
CraigFair wrote:
What exactly is 1 stop or 2 stops if I am shooting at f/10???
From f/10, the stops are basically f/7.1, f/5, f/14, f/20. Two stops is double or half, one stop is multiplied/divided by a square root of 2.
May 8, 2014 18:32:53 #
May 8, 2014 18:42:00 #
lighthouse
Loc: No Fixed Abode
CraigFair wrote:
What exactly is 1 stop or 2 stops if I am shooting at f/10???
Looks like I disagree with amehta which can be a silly thing to do, but my take is -
In addition to one at the correct exposure -
3 shot bracketed 1 stop is one at half as much light, and one at twice as much light
3 shot bracketed 2 stops is one at 1/4 the light and one at 4 times the light.
If you wanted to do the same thing manually, most cameras are set up at 1/3 stop clicks, so 3 clicks either way will be one F/stop.
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May 8, 2014 20:05:04 #
amehta wrote:
From f/10, the stops are basically f/7.1, f/5, f/14, f/20. Two stops is double or half, one stop is multiplied/divided by a square root of 2.
I'll bite. What's the square root of 2 ?
May 8, 2014 20:06:41 #
DavidPine
Loc: Fredericksburg, TX
lol... Sorry, it's the math thing.
amehta wrote:
From f/10, the stops are basically f/7.1, f/5, f/14, f/20. Two stops is double or half, one stop is multiplied/divided by a square root of 2.
May 8, 2014 20:16:55 #
DavidPine wrote:
I know. The only thing is however that 2 is an irrational number. It has no square root. Therefore multiplying or dividing by the square root of 2 is not possible.lol... Sorry, it's the math thing.
May 8, 2014 20:17:16 #
lighthouse
Loc: No Fixed Abode
amehta wrote:
From f/10, the stops are basically f/7.1, f/5, f/14, f/20. Two stops is double or half, one stop is multiplied/divided by a square root of 2.
Just to clarify what i was disagreeing with.
I propose that one F/stop is double or half the light.
And two F/stops is quadruple or quarter the light.
May 8, 2014 21:58:16 #
amehta
Loc: Boston
boberic wrote:
I know. The only thing is however that 2 is an irrational number. It has no square root. Therefore multiplying or dividing by the square root of 2 is not possible.
2 is an integer, the square root of 2 is an irrational number, but we can multiply and divide by it. For our photography purposes, we simply use the approximation:
a * sqrt(2) = 1.4 * a
a / sqrt(2) = 0.71 * a
Since a = 10 for f/10, going up or down by one stop is f/14 and f/7.1.
May 8, 2014 22:02:45 #
amehta
Loc: Boston
amehta wrote:
From f/10, the stops are basically f/7.1, f/5, f/14, f/20. Two stops is double or half, one stop is multiplied/divided by a square root of 2.
lighthouse wrote:
Looks like I disagree with amehta which can be a silly thing to do, but my take is -
In addition to one at the correct exposure -
3 shot bracketed 1 stop is one at half as much light, and one at twice as much light
3 shot bracketed 2 stops is one at 1/4 the light and one at 4 times the light.
If you wanted to do the same thing manually, most cameras are set up at 1/3 stop clicks, so 3 clicks either way will be one F/stop.
In addition to one at the correct exposure -
3 shot bracketed 1 stop is one at half as much light, and one at twice as much light
3 shot bracketed 2 stops is one at 1/4 the light and one at 4 times the light.
If you wanted to do the same thing manually, most cameras are set up at 1/3 stop clicks, so 3 clicks either way will be one F/stop.
What you said is correct. What I said was imprecise, so you are right to dispute it.
The correct thing I should have said is that "Two stops doubles or halves the f-stop number, and one stop has the f-stop number multiplied/divided by sqrt(2)."
May 8, 2014 22:03:18 #
May 9, 2014 00:51:01 #
boberic wrote:
I know. The only thing is however that 2 is an irrational number. It has no square root. Therefore multiplying or dividing by the square root of 2 is not possible.
As Amehta pointed out, "For our photography purposes, we simply use the approximation"
We can approximate the square root of two to be 1.414213562373095. To increase one stop up or down from f/10, we would use approximately f/14.14213562373095 or f/7.071067811865475. Since my camera is only calibrated for 1/4 and 1/3 stops, I generally go with, "give or take a stop or two and fix it in post processing".
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