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What do we mean by “full information viewfinder”?

The fully informed viewfinder shows us, in addition to view and focus, information about measuring the exposure process with shutter speed and aperture settings (Fig. shipped and ready to go for the next shot. Some viewfinders (usually the non-reflective type) specify distance adjustment on the lens by symbols. These symbols are usually head and shoulders, full length. Groups and sights contain Some viewfinders have an indicator to indicate battery strength, with a slow speed warning, and in some cases there is a signal that warns when a photo is taken with the flash that the photo is underexposed due to error in the adjustments and calibration operations.

The different means of displaying information from one camera to another, however, may be in the form of graduated scales on which pointer needles move, or in the form of small light bulbs (light-emitting diodes) or other luminous bulbs of different colors, or numbers that are reflected from the scales listed for the different controls or In the form of a liquid crystal display

Does the focus of the camera change with a short or long shot?

This question can be answered in the short negative. As long as the screen is clearly visible a sharply defined image will be in focus. Undoubtedly, if the aiming is so bad that the screen image is permanently blurry, it will be difficult or even impossible to see the correct focal point.

Is it possible to put glasses on the eyes when taking pictures?

Most modern cameras contain eye lenses in the viewfinder that help to see clearly through glasses. Some other cameras, although they have rounded edges that are cut off, may be impossible to use when wearing glasses. The answer to the question remains that we should try using the camera before buying it.

Can the viewfinder be adjusted when it cannot see well?

Some cameras still have refraction adjustments in the lens for farsighted or nearsighted photographers. We find that such expressions are very common in cinematic cameras. The viewfinder on many reflex cameras (especially those made in Japan, where most people who use these cameras are nearsighted) is set with a slight reverse correction. If this is not true of your field of vision and you cannot clearly see the screen image and any other information displayed in the viewfinder, most reflex cameras are equipped with an aid to mount sighting lenses on the rear viewfinder viewfinder. These lenses are available
Corrective lenses are obtained with different ocular refractive powers, either in the form of an accessory made by the camera distributor, or in some cases it can be made by the local optical instrument maker. Unless these lenses are manufactured according to your prescription and carefully fitted to the camera, these accessories will not be suitable for correcting any aspheric problems with your visual field, and even when these lenses are made according to your information, you should always remember. Rotate this accessory lens when the camera is rotated to take an upright shot, and reset it again for the next horizontal shot