by Rodrigo

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In addition to the LCD overlay in the viewfinder, covered well in this answer, some Canon lenses are focus-by-wire. Any of the STM series of lenses will not move focus elements when there is no power being supplied to the lens by the camera. From Bryan Carnathan at The-Digital-Picture: Additional typical Canon STM AF benefits include internal focusing, ...


Yes, it's normal behavior. The reason you're having problems is that the 5DMkIII has an LCD overlay in the viewfinder. This overlay is used to give you grid lines you can turn on and off and different AF point displays. Without power, the LCD becomes opaque. This behavior is identical in Nikon cameras with an LCD overlay in the viewfinder, and has long ...


Unfortunately unless you can fix the problem yourself, the repair will likely end up around as (or even more) expensive as a second hand lens of the same type. The 18-55 mm kit lenses are abundant since they come with the kits that people getting into DSLR photography are buying. When they upgrade their lenses they sell these lenses at low prices.


A cheap laser pointer that had tips that make a pretty pattern rather than a dot would present a target to focus on in a similar way to the assist lamp, for about a buck. You need to control it manually though. Hack the switch to make a momentary button in a convenient location as you hold the camera, and mount the laser to a "shoe" plate (or scrap of thin ...

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