50mm "Normal" Lens... Ok, but "Normal" on FF or APS-C Sensor?

Started Nov 10, 2012 | Discussions thread
oklaphotog Senior Member • Posts: 1,093
Re: 50mm "Normal" Lens... Ok, but "Normal" on FF or APS-C Sensor?

amosf wrote:

But as far as the relative size goes between near and far objects go, a 50mm lens is still a 50mm lens so gives the same sort of feel. It's not just about the size of the image or how much the width you capture. Understand what I mean? With a wider angle lens you get a different look in the depth of the shot, like more of it, same with a longer lens which tends to flatten everything. Go to the extremes to notice the effect.

Except that this is caused by camera to subject distance, not focal length. The reason why most tele shots look compressed is because in order to get enough FOV to get the subject in the frame, you would have to back up a lot giving a longer camera to subject distance. So to get the same FOV on a crop body with a 50mm, as you would with a 50mm on FF, you have to back up from the subject. Backing up from the subject will compress the image. Getting closer to the subject will stretch things out. The reason why people say wide angles distort people for portraiture is because you have to get really close to the subject to fill the frame appropriately.

if you set your camera on a tripod and put on a 28mm lens and focus it to any distance, lets say 25 ft, then take a 100mm lens and from the same camera location, focus it to 25ft, then crop the 28mm photo to have the same narrow fov of the 100mm lens, they will look identical.

Now if you take the 100mm and back up so that you end up with the same fov as the shot from the 28mm lens, then the 100mm shot will look compressed in comparison to the 28mm shot.

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