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martensit2016-04-28 14:15:00
Lenses
martensit, 2016-04-28 14:15:00

What type of lens to choose so that focusing to infinity starts from 20-30 cm from the camera?

What type of lens to choose so that focusing at infinity starts from 20-30 cm from the camera?
In general, everything is at a camera distance from 30 to 100 cm so that it is in one focus. With an aperture of 1.8-2.8,
the viewing angle should be no more than 70-80 degrees. diagonally, preferably less of course.
As I understand it, such lenses include "fisheye" .. but there the viewing angle is not satisfactory.
Maybe macro lenses? how do they behave when focusing on infinity?

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Roman Popov, 2016-04-28
@Roman_Popov

Somehow you are all in one pile ....
1. At what distance do you need focusing? Infinity or 30-100 cm? In photography, infinity "begins" from 30 m for a "normal" lens and from 100-300 m for powerful telephoto lenses.
2. The concept of depth of field (it describes what will be in focus), as well as the viewing angle, are inseparable from the dimensions of the recorder (matrix or film), and not a half line about it.
Therefore, it is simply impossible to answer.
Macro lenses at infinity behave badly. As their name implies, they are sharpened for shooting up close. In fact, these are lenses with a reduced minimum focusing distance, adapted for shooting close up, but what is drawn at infinity is not important.
art.photo-element.ru/ts/grip/grip.html - theory about depth of field at the level of understanding by a schoolboy
photo-element.ru/book/lenses/lenses.html - a lot of letters, no formulas, about lenses on the fingers.

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