In photography, a "normal" lens is defined as having a field of view most similar to that of the human eye. Traditionally, a 50 millimeter lens has been considered a "normal" lens. Consequently, any focal length other than "normal" can result in a distorted perspective (at least in comparison to how the human eye views the world).
A wide angle lens will create a perspective that appears to add more "depth" to an image. Objects closer to the camera will appear larger than normal, and objects farther away from the camera will appear smaller than normal.
In contrast, more narrowly angled lenses (telephotos) can give a "flattened" perspective to an image. This flattened perspective can result in objects that are some distance from each other to appear as though they are actually quite close to each other. This is quite a difficult concept to describe in words. However, with a little experimentation, you will find that it's quite simple to see how different focal lengths can create different perspective distortions.
At this point, I would certainly understand if you are a bit confused regarding how distorted perspectives can be used effectively in the creation of nude or erotic images. However, as you progress, I assure you that the concept will become more clear to you. For now, I want to give you some insight into perspective by explaining how it can be helpful in the creation of a specific type of erotic photograph:
A popular niche within the adult photography market focuses on the feet of models (in other words, "foot-fetish" shots). Fans of this niche like the emphasis of the photographs to be on the feet. However, these fans often don't want shots that show the feet only. Instead, they want to see the entire model; with the feet being the primary thrust of the picture. This effect can be accomplished in different ways.
My preferred way is to use a wide-angle lens. By using a wide-angle lens and taking the shot from fairly close to the feet, I'm able to emphasize this part of the body in a very interesting way.
More importantly, since I'm able to emphasize feet with this method, it stands to reason that I'll also be able to emphasize any other section of the body by using the same method. This technique is very important to know because, trust me, there are specialized fetish markets for just about every part of the body you can imagine.
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