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There are currently 2 types of Canon STM lenses: Fast and silent Lead-Screw Type STM and slow and noisy Gear-Type STM. The Gear type STM lenses (40mm 2.8 STM and 50mm 1.8 STM) work fine in manual focus with the EF-M, but the Lead screw type lenses (10-18mm STM and 18-135mm STM) will not manually focus. (I also tried the new 18-135mm Nano USM and it also ...


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A split prism finder uses 50% of the available light for each side of the split image on the focus screen. With the advent of autofocus a significant portion of the available light is redirected to the autofocus module; which results in insufficient light for a 50/50 split at the focus screen. I.e. a split screen installed in a modern AF DSLR is prone to ...


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Your assumption about analog vs. digital viewfinders is incorrect. Some digital cameras still use "two misaligned half circles" for focusing and some analog film cameras do not. "two misaligned half circles" for focusing is also called "Split Prism" and was a focusing aid used in most older, Manual Focus cameras. When Auto Focus lenses were developed for ...


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The analog camera you use most likely has no autofocus and thus has a split prism. These are great for manual focusing, but not so great for auto exposure (AE), as AE is done after the focusing screen. Since AF usually works fast (and has a confirmation by LEDs), most cameras use plain focusing screens, though some professional cameras offer interchangeable ...


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