LENSES IN SMALL SCREENS.
The construction of lenses used in 35mm reflex cameras is very diverse. The simplest are three-lens triplets (drawing), consisting of three separately built-in …
Photographer
LENSES IN SMALL SCREENS.
The construction of lenses used in 35mm reflex cameras is very diverse. The simplest are three-lens triplets (drawing), consisting of three separately built-in …
LENS MAINTENANCE.
The performance of the lens depends on careful maintenance. It is a high-precision optical device and requires very careful handling. For wiping lenses with …
AUTO IRIS.
A fundamental facilitation of the photographer's work, controlling the image on the focusing screen through the lens until the last moment, there are priority and automatic apertures.
Pre-selective apertures are built-in …
LENS FITTING.
The frame of the lens has a decisive influence on its quality. Made without due precision, it significantly worsens the correction of even the best set of lenses. Too soft metal (wrong …
BRIGHTENING LENSES WITH ANTI-REFLECTION COATINGS.
In the considerations regarding the brightness of the lenses, it is assumed, that the illumination of the image depends only on the area of the entrance pupil and the focal length. Not quite …
RESOLUTION AND CONTRAST TRANSFER.
Reading the sharpness of the lens drawing is based on two measurements, namely the assessment of resolving power and contrast transferability, co …
DEPTH OF FOCUS
strictly speaking, the lens draws sharply only in one plane, in that, has which he has been set (theoretically, it even has a bowl surface, corresponding to the curvatures …
LENS BRIGHTNESS
Between the objective lenses, or outside, aperture is placed. It is an arrangement of sickle-shaped lamellae, allowing the opening to be enlarged or reduced, because of which …
PICTURE ANGLE
On the focusing screen placed behind the lens perpendicularly to its axis, the central part of the image is sharp, but decreases with distance from the center of the image …
FOCUS OF THE LENS
The lenses used in 35mm SLR cameras are multi-lens systems, created by painstaking calculations and trials.
The most important feature of a lens is its focal length. from her …