Snap Front Lens

Snap Front Lens
A pressing perspective question — what will the pic look like?

I ask my favourite model Glenda to stand 10 feet in front of a tree.

Using my 20mm lens, I snap a picture of her, head to toe, so she’s in line with the tree.

I then put on my 50mm lens and take another picture of her, keeping her the same size.

Then I bolt on a 400mm lens and snap another pic, with her the same size as in the first two.

I look at the pics and I see that the tree appears to get progressively closer to Glenda until it looks like it’s right behind her.

Now, standing where I stood to take the 400mm pic, I toss on the 20mm and take one more.

I open up the image in Photoshop and crop out tiny Glenda and the tiny tree.

My question is, will that pic look like the first 20mm image or like the 400mm pic?
To clarify: In the 20mm shot taken at the 400mm distance, will the tree look like it’s right behind Glenda, like in the 400mm shot? Or will it look like the original shot I made with the 20, where the tree looks far back? Or somewhere in between?

Okay, the question is a little confusing but let me try and understand. At first glance it seems to me that the excercise is more of a study of optical compression than perspective if you’ve kept the images framed in the same way. That being said, to keep the images framed the same, your shooting position would change with the 50mm lens from where the shot was taken at 20mm and the same with the shot taken at 400mm repsectively. Now after taking the image with the 400mm lens, standing in the same place you changed the lens once more to the 20mm lens. Are you asking will that image look the same (at 20mm) than the first taken at 20mm? If so, I say no because the image would be much wider than it was the first time after filling the frame at 20mm, from a shooting position used to fill the frame at 400mm. the 400mm lens is 20x longer than the 20mm, therefore your shooting position would be 20x the distance from the original shot. That’s my understanding anyway, so unless this is a trick question I stand by that explanation. Now you cropped the final image down, framing Glenda and the tree taken from the 400mm lens postion, right? Now, back to the compression excercise. An image framed at 20mm when compared to one framed at 400mm would have major differences in percieved perspective due to the optical compression experienced at that focal length, making the two objects (the tree and your model) seem closer than they actually are. That is why we like to use longer lengths when shooting portraits than wider because the compression flatters the features of the subject (in the studio, anyway). With a crop in the final position to frame the tree and your model, in the image, would be a lot different from the other shots in that the resolution would be cruddy (unless you’re using some serious image size), but the optical compression would not complement the image, even while cropped. (if that’s what you did)

So anyway, I’m not sure I really answered your question right. You think?

EDIT: (for extra details)

Hmm, that’s what I figured you wanted to know and I’m convinced that with classic telephoto lens compression and its inherent optical properties the two shots would be slightly different. But from that distance, it would be really hard to tell. Even from a 100% crop.

MASSA 62mm Snap-on Front Lens Cap Cover with Sling for Nikon 2 Pcs

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