Minolta X-570
Encyclopedia
The Minolta X-570 was introduced in 1983 as a lower cost alternative to the X-700
Minolta X-700
The Minolta X-700 is a 35 mm single-lens reflex camera introduced by Minolta in 1981. It was the top model of their final manual-focus SLR series before the introduction of the auto-focus Minolta Maxxum 7000...

. It used the same chassis as the rest of the Minolta X series and the standard Minolta SR mount. The primary difference between the top of the line X-700 and the X-570 is that the latter lacked the fully automatic Program exposure mode. However, the X-570 added an important feature that would be part of all subsequent X series cameras, but never added to the X-700, a match LED exposure meter
Light meter
A light meter is a device used to measure the amount of light. In photography, a light meter is often used to determine the proper exposure for a photograph...

. This system indicated the selected shutter speed
Shutter speed
In photography, shutter speed is a common term used to discuss exposure time, the effective length of time a camera's shutter is open....

 is shown with a blinking LED and the suggested shutter speed, based on the exposure value and the selected lens aperture, is indicated with a solid LED.
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