Compression is Real

Started 11 months ago | Discussions thread
dsjtecserv Veteran Member • Posts: 3,754
Re: With respect to perspective, yes.
3

JackM wrote:

Mike CH wrote:

JackM wrote:

Do you think an image taken at 100mm and another taken at 400mm, from the same position, are comparable images?

Comparable with respect to perspective and "compression" - absolutely. With respect to that attribute, they are close to identical in the parts that are common to both images. Resolution and DoF will differ of course.

Given, of course, that you are shooting in the exact same direction.

But they're not comparable images. Unless you think a landscape can be compared with a portrait.

No one said they were. It was you who chose the subject of the thread, which is "compression"; aka perspective. The pictures differ in a way that has nothing to do with perspective. We would simply suggest you stick to the subject you raised.

When we take a picture, we have a certain goal, a certain framing in mind. Using a longer focal length will force you into a position to get more compression in that frame.

What is it that you want, a certain framing, or a certain compression? To get both, you will need to make certain decision about both your shooting position relative to the subjects, and your focal length. Neither dictates the other.

On the other hand, if you only have framing in mind, you can use an infinite number of focal lengths, and simply adjust your position, and thereby passively accept whatever perspective you get from that position. So you may indeed choose a 200 mm lens, and then wander around until you find the position that frames the scene the way you want it. But the resulting perspective is still the result of your location. You simply chose to go there as a result of a previous decision you made, and you are just accepting whatever perspective results. And that's fine, just don't be under any illusions about what caused the results you get.

Dave

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