Photophys.com: The Science of Photography

I recently purchased a Samyang (Rokinon, Bower, Walimex) 14mm lens after reading glowing reviews of it. For example: “It is insanely great” Tim Ashley’s Blog, “ I think it’s an insane bargain for a very sharp lens” Roger Cicala of Lensrentals, and “…may be the surprise product of the season.” Photozone.de. Overall this is a great lens, and similar lenses from the big name manufacturers cost five times as much. However, one should be aware that the Samyang beast is strictly mechanical. One must get used to that. There is no electronic contact with the camera for focus or exposure. Fortunately, focus is manageable given the large depth of field; and exposures are sort of automatic on my Canon camera in the aperture priority mode.

The complete article (414 KB PDF) can be found here.