DIOPTER CORRECTION- This is like a focus adjustment that matches the focus of the camera's optical viewfinder to the user's eyesight. This way, users don't have to wear their glasses when using the camera.
Diopter Correction
An adjustment on the viewfinder of a camera, allowing someone to adjust the viewfinder to their vision and removing the need to wear their glasses when looking through it.
There is a +/-3 diopter correction in the viewfinder, so divers with corrected vision can customize accordingly.
The magnified view is nearly 1:1 life-size, making it extremely easy to read the LED display at the bottom of the camera's viewfinder.
The A55 and A33 feature a large, high resolution EVF, with diopter correction and an automatic EVF/LCD switch sensor (visible as the dark rectangle beneath the eyepiece in this image).
Just wondering why nobody mentioned the EMO Macromax 4x loupe. It is really sharp (tests in german photog magazines gave EMO and Schneider loups the same rating), and has a diopter correction. Price is about $100.
2 - Reflex mirror at 45-degree angle
3 - Focal plane shutter
4 - Film or sensor
5 - Focusing screen
6 - Condenser lens
7 - Optical glass pentaprism (or pentamirror)
8 - Eyepiece (can have diopter correction ability) ...
Some advanced models included depth-of-field preview, mirror lock-up, spot metering, and a few extras such as diopter correction, self timer, PC terminal, and AE-lock. These were all the features photographers needed to take great pictures.
 See also: Finder, Viewfinder, Speed, Diopter, Light
  
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