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It is confusing me that some posters keep writing that use of a telephoto increases depth-of-field. The way I use telephotos, they decrease depth-of-field, at least for a given image size of a particular subject.
This is why those photos looking down railroad tracks look like roller coasters. Depth and perspective are reduced, making gradual grade changes look drastic.
But you're talking about subjects that are many feet from the camera and a depth-of-field going into infinity. In our case you need to think more about how a telephoto lens allows us to move farther back from an object which will effectively increase DOF for our purposes.Jason
So, no...telephoto lenses do NOT increase DOF with respect to equal apertures and distances compared to wide and ultra-wide angle lenses as these photos graphically illustrate.
If only that was what we were talking about. Using zoom to keep more of a scene in focus is a tried and true tradition of model railroaders and it works for that specific goal. There are several members, past and present, who use that technique regularly for the images they post here. You can always tell by how flat the perspective is.Jason