I will add a few words about the Canon EF 50mm f1.2L USM. This is a good lens. With very nice color rendering, bokeh and patterns. He can't help but like it. It is also pleased with its construction, strong and reliable, in contrast to the simpler fifty rubles from Canon. The only and very significant drawback is its cost. This is an expensive lens. Moreover, its differences from Canon 50mm f1.4 in my opinion are absolutely not worth the extra thousand dollars.
Why isn't fifty dollars good for full-height portraits? In the examples below, you can see what a full-fledged portrait lens with a focal length of 135mm (Canon 135mm f2L) compared to the standard 50mm (Canon 50mm f1.4). All photos were taken at open apertures f2 and f1.4, respectively.
The photography took place in Mariinsky park early March, when there is still no greenery. In such conditions, the maximum blurring of the background is very important.
Lenses with these focal lengths convey perspective in completely different ways. At 135mm, in addition to the strong bokeh, the background compression effect is well felt. In most cases, this is beneficial. Especially here. Bare black branches, which cannot be hidden when shooting at fifty dollars, clearly do not make the photo attractive.
A similar situation. Only here the background is even more complex. There are a lot of unnecessary things in the frame at 50mm. The environment is clearly distracting from the model. The 135mm frame is perceived much better. We can say that this lens saves in any circumstances. Whatever trash is in the background, you can always annihilate it.
Here fifty kopecks obviously loses in all respects. The girl even stopped smiling. The transmission of perspective to 135mm allows you to focus on the girl, and not on the trees above her head, paving slabs under her feet or a bench. It's hard to see here, but at fifty dollars, her sneakers are already out of focus. At 135mm, the girl is sharp from head to toe.
But with a bust portrait, the situation is slightly different. The fifty dollar already blurs the background more. However, the people on the right in the bottom photo are still readable. 135mm makes a completely abstract picture out of the background with such a large size, where nothing distracts from the model.
135mm (or 85mm) are ideal lenses for portrait photography. 50mm can perform this function, but with reservations. It can give good photos when cropped to the waist and good backgrounds. You can't call him a full-fledged portraitist.
I just got to another article with a widespread heresy that 50mm corresponds to the angle of human vision.
Often half a ruble positioned as a standard lens. It can, of course, be used as standard. But the angle of view of the 50mm lens does not correspond to human vision at all.
Let's think about how a person sees in order to finally understand this issue.
Wikipedia tells usthat a person sees with two eyes in front of him about 190 degrees in all directions. The angle of view of a 50mm lens on a full frame is approximately 50-55 degrees. Accordingly, for a fifty-kopeck piece to correspond to a person's angle of vision, a person will have to put on blinkers. Then it will be fair.
The picture below roughly illustrates the human field of view.
For the lens to match our field of view, it must be wide-angle... If we take full coverage of peripheral vision, then this should be a lens with a focal length of approximately 14mm... If we talk about the zone of comfortable vision, then the focal length should be approximately 28mm... But not 50mm. Fifty is a lens that significantly narrows the visible area in front of you. This can and should be used, but it is not worth talking about the full field of vision of a person.
If you need a lens to walk around and scan everything "as it is" in front of you, you need a shirik. No wonder the cameras in all smartphones are equipped with a lens of about 30mm.
There is another important nuance.
The fifty dollar really corresponds to human vision in terms of conveying perspective.
If you wear a lens with a focal length of less than 50mm, the perspective in the frame will expand. Distant objects will look farther than we see them with our own eyes.
If we use a telephoto lens, that is, with focal lengths over 50mm, then objects in the distance will appear closer than they are.
And exactly 50mm is the golden mean, which gives us the correct three-dimensional picture in terms of perspective.
Perspective and angle of view are different things and should not be confused.