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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 07 Apr 2010 (Wednesday) 08:50
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How many steps between 24 and 50mm ?

 
mrbtd
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Apr 07, 2010 08:50 |  #1

I know this sounds odd. I love my prime lenses (50 and 85mm) but sometimes there is no room to zoom with my feet. Can anyone estimate the number of steps between a 24 and 50mm lens ?




  
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Shadowblade
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Apr 07, 2010 08:55 |  #2

Depends on the distance to the intended subject, and the depth of the subject.

For a headshot portrait, it will likely only be one or two steps to get similar framing (although perspective distortion will be a factor). For a landscape, it might be miles, and, if it is the entire landscape, rather than a single feature, which is to be the subject of the photo, there is no way to get similar framing.




  
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Lyndon ­ Chen
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Apr 07, 2010 11:07 |  #3

Shadowblade wrote in post #9949409 (external link)
Depends on the distance to the intended subject, and the depth of the subject.

For a headshot portrait, it will likely only be one or two steps to get similar framing (although perspective distortion will be a factor). For a landscape, it might be miles, and, if it is the entire landscape, rather than a single feature, which is to be the subject of the photo, there is no way to get similar framing.

^ Excellent answer. As noted, you'll never take the same image with the 24mm and 50mm. By stepping forward to make subject size the same, you'll always include more background with the 24mm. OTOH, by using both lenses at the same distance to the subject, you can get a similar image by cropping the 24mm to the 50mm. Depth of field will be different however.


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SkipD
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Apr 07, 2010 11:09 |  #4

mrbtd wrote in post #9949395 (external link)
I know this sounds odd. I love my prime lenses (50 and 85mm) but sometimes there is no room to zoom with my feet. Can anyone estimate the number of steps between a 24 and 50mm lens ?

You really need to understand that "zooming with your feet" actually changes the image quite a bit. Moving the camera's position changes the perspective. Changing the perspective changes the composition of the image.

To learn more about perspective and how to control it, please read our "sticky" (now found in the General Photography Talk forum) tutorial titled Perspective Control in Images - Focal Length or Distance?.

The bottom line is that one should be choosing a focal length for framing the image, but only after choosing the position to shoot from.


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bohdank
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Apr 07, 2010 11:30 |  #5

All true but when your back is against a wall, all of this information is of little value.

The difference in distance between 24 and 50 is almost 1/2. So, if you took a shot with the 50 at 20 feet, you'd be at 10 feet with a 24mm to get the same framing.


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How many steps between 24 and 50mm ?
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