Adapting (and focusing, and exposing, and troubleshooting) 3rd party lenses to the Fujifilm X-mount cameras, by Rico Pfirstinger at Fuji Rumors.

Adapting (and focusing, and exposing, and troubleshooting) 3rd party lenses to the Fujifilm X-mount cameras, by Rico Pfirstinger at Fuji Rumors.

Rico's article also includes the handling of the Metabones Speed Booster adapter on a Fujifilm camera:

"The X-Pro1 is not a rangefinder camera. It’s a pure-bred autofocus camera and as such—despite its hybrid viewfinder—it is only marginally equipped to work in combination with manual focus lenses. Currently, the only tool that the X-Pro1 and X-E1 feature to assist with manual focusing is a magnified digital viewfinder. The camera also offers some kind of focus peaking when you magnify the viewfinder image: It will enhance contrasty edges, indicating that they are in-focus.

Unfortunately, there are a few further aspects that render the X-Pro1 and X-E1 not yet perfectly equipped for working with third-party lenses: When a lens is attached to the X-Pro1 via an adapter, Auto-ISO operates with a minimum shutter speed of 1/30 second—independently of the actual focal length that was set in the adapter menu. 1/30s may be too fast for many wide-angle lenses and too slow for most standard and telephoto lenses. The cameras also set the

minimum flash sync speed at a fixed 1/15 second when a third-party lens is attached, which is largely useless for lenses with larger focal lengths. In other words, the cameras “know” exactly what the current focal length is, but doesn’t use this information to the benefit of the photographer."

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