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Leica R4-R7 : ウィキペディア英語版
Leica R4-R7
Leica R4, R5, R6, R7 were 35mm SLR cameras manufactured by Leica between 1980 and 1996.
Following the success of the Leica R3 the company, in continuing cooperation with Minolta, produced the R4-R7 series all based on the same chassis.
== R4 / R4s ==
Based on Minolta XD-7 but with Leica developed exposure metering, mirror box, and newly designed body, the R4 followed the trend setting Olympus OM-1 and was much smaller and lighter than all earlier Leica SLR cameras. Like previous models the R4 offered selective metering and viewfinder information was comprehensive showing metering / exposure mode, shutter and aperture settings, exposure level, and flash ready.
Five exposure / metering modes were available:
* Manual exposure / selective metering
* Aperture priority semi automatic exposure / selective metering with exposure lock
* Aperture priority semi automatic exposure / integrated (centre weighted) metering
* Shutter priority semi automatic exposure / integrated (centre weighted) metering
* Program automatic exposure / integrated (centre weighted) metering
A rotary dial selected the mode, changing between integrated & selective metering was effected by a small lens moving in front of the meter cell which was mounted in the camera base like previous models, but moved forward and angled towards the film plane. This was to allow the same cell to measure both selective and full field for which the secondary mirror was larger than earlier cameras. Selective metering measured from the central focussing area only, a circle about 7mm of the viewfinder image.
Offered from 1983 the R4s was a lower cost model with reduced features lacking shutter priority and program modes, however incorporating some improvements to the controls.
Automated flash control was not provided but flash ready was indicated in the viewfinder by suitable flash units which also selected flash synchronisation speed 1/100s.
The camera was assembled by the Leica factory in Portugal. Early production R4 cameras suffered from electronic failures which marred the reputation of Leica for reliability.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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