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FORUMS General Gear Talk Camera Vs. Camera 
Thread started 22 Mar 2015 (Sunday) 21:30
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Faster shutter speeds of crop vs. full frame?

 
bobbyhicks
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Mar 22, 2015 21:30 |  #1

I was shooting with a friend a while back who was shooting crop and I was shooting full frame. I noticed consistently his shutter was firing much faster than mine, even though we were both shooting aperture priority, same speed lens, bracket shots. Well I just kissed it off to my canon vs. his nikon and forgot about it.

I bought a new 70D going backwards as some would say, but I wanted the articulating screen to be able to get certain shots easier. I have now shot with my new 70D only on one outing but I do believe I am seeing faster shutter speeds than I did with the 5dm2 using same favorite 24-105 f4L. Anyone else seen this difference in faster shutter speeds of crop vs. full frame?


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Aswald
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Mar 22, 2015 21:44 |  #2

I would say it depends on a few things.

1. Subject being shot.
2. Memory card type and speed.
3. Camera's built in write speed.
4. Shutter settings.
5. File settings. Raw/Raw+L/Raw+M/Raw+S, etc....

Generally, newer cameras have higher write speed and better buffer.

I tried 2 sd cards on an eos-m. one is a standard 30mb/s and the other was a 60mb/s card. 1st card I shot 3 continuous shots before it slowed down, while the other I could make it 4.5 - 5 shots before it slowed down. The 2nd card felt as if it was also "faster" and cleared it's buffer quicker.




  
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tabi_24
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Mar 22, 2015 21:50 |  #3

Do you just mean the fps? Certain cameras fire more frames per second than others. It has nothing to do with Full Frame vs. Crop. It's just a spec of the camera. The 7D (crop) does 8fps. The T2i (also crop) only does 3.7fps.


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sandpiper
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Mar 22, 2015 22:08 |  #4

tabi_24 wrote in post #17487435 (external link)
Do you just mean the fps? Certain cameras fire more frames per second than others. It has nothing to do with Full Frame vs. Crop. It's just a spec of the camera. The 7D (crop) does 8fps. The T2i (also crop) only does 3.7fps.

Yes, and the FF 1Dx does 12 fps and is faster than any Canon crop camera. Yes some crop cameras are faster than some FF ones, but some are slower too. It has nothing to do with sensor size.

I am confused by what the OP is talking about though, is it fps or do they actually mean shutter speeds? If so, how are they "noticing" the faster shutter speed? Unless using very slow shutter speeds you won't hear a significant difference in the shutter opening and closing. Most of what you hear is the mirror clacking up and down, and that may sound quicker in one model to another, but again is not related to sensor size.

Shutter speed needed for correct exposure doesn't alter depending on sensor size, it remains constant at any given aperture and ISO, regardless of format. Otherwise, current exposure meters would be useless.




  
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tabi_24
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Mar 22, 2015 22:13 |  #5

sandpiper wrote in post #17487451 (external link)
Yes, and the FF 1Dx does 12 fps and is faster than any Canon crop camera. Yes some crop cameras are faster than some FF ones, but some are slower too. It has nothing to do with sensor size.

I am confused by what the OP is talking about though, is it fps or do they actually mean shutter speeds? If so, how are they "noticing" the faster shutter speed? Unless using very slow shutter speeds you won't hear a significant difference in the shutter opening and closing. Most of what you hear is the mirror clacking up and down, and that may sound quicker in one model to another, but again is not related to sensor size.

Shutter speed needed for correct exposure doesn't alter depending on sensor size, it remains constant at any given aperture and ISO, regardless of format. Otherwise, current exposure meters would be useless.

"I noticed consistently his shutter was firing much faster than mine" leads me to believe they are referring to the fps. I never looked at the specs of the 1Dx, that's awesome. I have a 7D and love the 8fps but I don't really use it too much anymore so I couldn't justify the 1Dx.


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Echo63
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Mar 22, 2015 22:27 |  #6

sandpiper wrote in post #17487451 (external link)
Yes, and the FF 1Dx does 12 fps and is faster than any Canon crop camera. Yes some crop cameras are faster than some FF ones, but some are slower too. It has nothing to do with sensor size.

It will actually do 14fps - but it locks the mirror up for the duration of the burst.

12fps is the max with the mirror flipping up and down and autofocusing between frames


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bobbyhicks
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Mar 22, 2015 22:33 as a reply to  @ tabi_24's post |  #7

I was referring to shutter speeds picked by camera while both shooting same subject, set on aperture priority. We checked when I noted the sound of his being faster, and his crop were much faster than my ff.


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bobbyhicks
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Mar 22, 2015 22:35 as a reply to  @ Aswald's post |  #8

I thought write speed was the card?


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bobbyhicks
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Mar 22, 2015 22:36 as a reply to  @ tabi_24's post |  #9

No I mean shutter speeds not fps.


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Motor ­ On
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Post edited over 4 years ago by Motor On.
     
Mar 22, 2015 22:37 |  #10

In AV you may see a faster shutter speed on a crop camera in order to compensate for the crop factor. The camera system a lot of times will attempt to keep 1/focal length for the shutter speed; with a crop camera the camera will try to keep 1/(1.6xfocal length). This is to prevent motion blur from hand movement.

All of that covered, I wouldn't too much about what others are doing, just make images how you desire them.

Edit: It could also be a number of other factors, the focal length, metering mode and framing and ISO all factor into how long the computer thinks the shutter needs to stay open. The best way to know conclusively would be to compare the information attached to each image side by side.


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bobbyhicks
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Mar 22, 2015 22:38 as a reply to  @ sandpiper's post |  #11

Sorry I'm new and trying to learn. What do you mean by OP?


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Echo63
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Mar 22, 2015 23:25 |  #12

bobbyhicks wrote in post #17487480 (external link)
Sorry I'm new and trying to learn. What do you mean by OP?

OP is normally "original poster"
Or the Person who started the thread

In this case - thats you (i dont know if you see it - but for the rest of us, there is a red "thread starter" under your name in this thread)


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Mar 23, 2015 11:31 |  #13

bobbyhicks wrote in post #17487475 (external link)
I was referring to shutter speeds picked by camera while both shooting same subject, set on aperture priority. We checked when I noted the sound of his being faster, and his crop were much faster than my ff.

If you use the same focal length in Av both on both a crop and ff Canon body, the shutter speed chosen by the crop body will be ~1.6x faster than on the ff body to try to reduce blur due to camera shake. This is only a function of the Av logic compensating for narrower field of view (and thus greater sensitivity to camera shake) on the crop body compared to the fullframe body.


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Wilt
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Post edited over 4 years ago by Wilt. (12 edits in all)
     
Mar 23, 2015 11:43 |  #14

Motor On wrote:
The camera system a lot of times will attempt to keep 1/focal length for the shutter speed; with a crop camera the camera will try to keep 1/(1.6xfocal length). This is to prevent motion blur from hand movement.

raptor3x wrote in post #17488194 (external link)
If you use the same focal length in Av both on both a crop and ff Canon body, the shutter speed chosen by the crop body will be ~1.6x faster than on the ff body to try to reduce blur due to camera shake. This is only a function of the Av logic compensating for narrower field of view (and thus greater sensitivity to camera shake) on the crop body compared to the fullframe body.


1. There is no camera which has the logic built into its 'shutter speed = FL/1.6' rule of thumb... That is a rule of thumb for the PHOTOGRAPHER to apply! A meter is a meter, and has no idea of the size of the camera's sensor or film, so has no clue as to any rule of thumb about camera motion and allowable shutter speed for handholding.

2. The same FL on APS-C vs. FF will result in a narrower Field of View on the APS-C camera, due it is 1.6x smaller sensor.
If the metering systems of both cameras measures the frame content of both frames while using identical FL and same camera position,

  • the APS-C meter MIGHT read different reading than FF meter, merely because the frame areas read varies naturally between the two cameras, and the brighter, outer area at the edges of the frame can result in a faster shutter speed
  • But if both cameras were pointed at the same blank uniformly lit wall, the meters should measure the SAME shutter speed with the same aperture, in spite of difference of FOV.


To illustrate how framing changes metering, here are two shots with the same camera with the same position, but with different areas framed (shot 2 FL is about FL/1.6 compared to shot 1!)

IMAGE: http://i69.photobucket.com/albums/i63/wiltonw/Principles/framing%20metering_zpsom9ri57m.jpg


The shot on the left meters 1/60, the shot on the right meters 1/80 !

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Aswald
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Mar 23, 2015 21:06 |  #15

Wilt wrote in post #17488208 (external link)
1. There is no camera which has the logic built into its 'shutter speed = FL/1.6' rule of thumb... That is a rule of thumb for the PHOTOGRAPHER to apply! A meter is a meter, and has no idea of the size of the camera's sensor or film, so has no clue as to any rule of thumb about camera motion and allowable shutter speed for handholding.

2. The same FL on APS-C vs. FF will result in a narrower Field of View on the APS-C camera, due it is 1.6x smaller sensor.
If the metering systems of both cameras measures the frame content of both frames while using identical FL and same camera position,

  • the APS-C meter MIGHT read different reading than FF meter, merely because the frame areas read varies naturally between the two cameras, and the brighter, outer area at the edges of the frame can result in a faster shutter speed
  • But if both cameras were pointed at the same blank uniformly lit wall, the meters should measure the SAME shutter speed with the same aperture, in spite of difference of FOV.


To illustrate how framing changes metering, here are two shots with the same camera with the same position, but with different areas framed (shot 2 FL is about FL/1.6 compared to shot 1!)

QUOTED IMAGE

The shot on the left meters 1/60, the shot on the right meters 1/80 !

+1 :-)




  
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Faster shutter speeds of crop vs. full frame?
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