Compression is Real

Started 11 months ago | Discussions thread
dsjtecserv Veteran Member • Posts: 3,754
Re: Compression is Real

JackM wrote:

Brian_Flex wrote:

Spot on. Here's a similar test we did, but only the focal length changed. These are just screen grabs.

Actually, if you cropped the wide-angle image to achieve the same framing as the subsequent images, you'd see that the elements in the background of the cropped wide-angle image would be the same size as in the subsequent images.

And this is where the anti-compression camp does a little dance and thinks they're right. The problem is, a tiny crop is not comparable to a full resolution image. Only idiots using the "zoom" on their smartphones think so.

Sure, semantically, one lens "has" no more compression than any another. But a longer focal length will force you to position yourself further away from your subject, and you will get more compression.

First, your repeated injunction of "anti-compression crowd" despite the fact that several people have made clear that no one is against compression, now becomes intellectually dishonest. You are trolling, and not engaging in good-faith discussion.

So you are acknowledging that that when shot from the same position, regardless of focal length, the pictures will have the same relationships of near and far subject sizes and positions. That is perspective. Thus you are acknowledging the key point in the discussion, that if the shooting position relative to the subjects is the same, the perspective doesn't change, and if you want the perspective to change, you have to move. Good, that is progress.

Now you want to go on to say the pictures aren't comparable because they have different framing. You are correct that they not comparable with respect to framing, even though they are comparable with respect to perspective. No one would argue that, and no one has. Both perspective and framing (along with numerous other factors) combine to create the overall impression of the final image. But that doesn't mean they are the same thing, nor does it mean that they are controlled by the same factors.

A skilled photographer knows how to use different factors to control different effects in order to realize the desired outcome. That includes recognizing the independent effects of position (perspective) and focal length (framing and magnification), and using them for creative purpose. Treating them as the same thing is just inept photography.


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