Still learning the 'Sunny 16 Rule' here, with a set of close-up images from the garden shot on the 10MP CCD Nikon D80 mounted with a manual focus Tamron SP 90mm 1:2.5 Adaptall-2 Macro. The 10MP CCD Nikon D80 which does not have the 'Non-CPU Lens Data' menu item or enter information about non-CPU lenses, and the aperture-indexing finger for full-aperture metering with older 'AI' lenses, can only be used in manual mode when mounted with an old-school manual focus lens.
The whole idea here is not to let an excellent vintage enthusiast-grade digital SLR camera, such as the Nikon D80, go to waste by waiting for it to be mounted only with CPU AF lenses, nor letting the cult classic Tamron SP 90mm 1:2.5 Adaptall-2 Macro be equally wasted by wanting it to be mounted only on auto-exposure cameras. Band these two items together, learn to set the exposure manually, and you will probably enjoy photography more than you expected. Exposures were made at 1/200 second, ISO 200, with apertures between 1:2.5~5.6.
The 'Sunny 16 Rule', which says that 'On a sunny day set aperture to f/16 and shutter speed to the [reciprocal of the] ISO film speed [or ISO setting] for a subject in direct sunlight,' is an easy way to set your camera’s exposure if you are shooting fully manual or with a fully manual camera. Start with the basic setting of the ISO speed to 100, the lens aperture opening to f/16, and the shutter speed to 1/100 or the nearest available on the camera. When ISO (ASA) 200 film is used, set the aperture at f/16 and the shutter speed to 1/200 or 1/250 second.
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