This system indicated the selected shutter speed with a blinking LED and the suggested shutter speed, based on the exposure value and the selected lens aperture, with a solid LED . Some consider the X-500 more of an enthusiast's camera than the X-700, since it offered no P mode and therefore required some photographic knowledge.
42.
This histogram, which shows the concentration of tones, running from dark on the left to light on the right, can be used to judge whether a full tonal range has been captured, or whether the exposure should be adjusted, such as by changing the exposure time, lens aperture, or ISO speed, to ensure a tonally rich starting image.
43.
Instead, the lens aperture ring had to be turned back and forth to the smallest aperture ( largest f-stop number ) and then to the largest ( smallest number ) immediately after mounting to ensure that the lens and the FTn couple properly ( Nippon Kogaku called it indexing the maximum aperture of the lens ) and meter correctly.
44.
The mount is descended from those used for the Leicaflex, Leicaflex SL and Leicaflex SL2 SLR cameras, but differs in the cams used to communicate lens aperture information to the camera . 3 cam lenses are compatible with all of the Leica SLR cameras, while R-only lenses have a slightly different mount shape that will not fit on the earlier cameras.
45.
The FE has a " full information " viewfinder very similar to the Nikkormat EL . In addition to the metering shutter scale, the viewfinder also displays the set lens aperture through an optical " eye " ( this particular feature missing on the Nikkormat EL ) and has a flash " ready " LED to give context to the metering needles.
46.
The size of this area is determined by the diffraction-limited resolution of the lens which is given by the Airy disk whose diameter is 2.4?u / D, where ? is the wavelength of the light, u is the distance between the object and the lens, and D is the diameter of the lens aperture . ( This is a simplified model of diffraction-limited imaging ).
47.
After mounting, the lens aperture ring must be turned back and forth to the smallest aperture ( largest f-stop number ) and then to the largest aperture ( smallest f-stop number ) to ensure that the lens and the head couple properly ( Nippon Kogaku called it indexing the maximum aperture of the lens users called it the Nikon Shuffle ! ) and meter correctly.
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