Nidelva river through Trondheim Norway

Nidelva river through Trondheim Norway
by Saaru Lindestokke                

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Modern Pentax SLRs don't have stop-down aperture coupler on the body mount - mechanical linkage that links to lens aperture ring. Why? Because modern cameras communicate with the lens using electronic or digital signal protocol, thus rendering mechanical protocol unneeded. Because mechanical components have higher costs (more finely machined, moving parts) ...

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