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Old April 28th, 2018, 12:59 PM   #1
Inner Circle
 
Join Date: Dec 2003
Location: PERTH. W.A. AUSTRALIA.
Posts: 4,375
METABONES 0.71x Optical cell in BM URSA 4K PL

For the curious, the Metabones "Ultra" 0.71x Speedbooster optical cell can be fitted within the throat of the "big" URSA camera.

I initially sought only to add one into the optical path for my Nikon F-Mount fitment. The optical cell requires the flange face of the mount to be moved around 4.2mm rearwards for correct focus to be maintained to the sensor.

The Nikon mount I made is narrow enough to fit rearwards inside of the camera body. I initially thought that the BM PL-Mount could not be used with the Speedbooster in place however I recently examined the possibility and have found that with some material machined off the rear of the PL-Mount locating tail and from the rear of the clamp ring and "ears" for tightening it, this is doable - JUST.

The position of the Speedbooster optical cell in the throat of the camera reduces the number of PL-Mount lenses which can be used. Some lenses will penetrate inside the mount too far rearwards and will clash with the Speedbooster optical cell and damage it and the rear of the lens. Some vintage lenses also will have an image circle too small to be used with the Speedbooster in place.
Attached Thumbnails
METABONES 0.71x Optical cell in BM URSA 4K PL-bmursa4ksppl1reduced.jpg   METABONES 0.71x Optical cell in BM URSA 4K PL-bmursa4ksppl2reduced.jpg  

METABONES 0.71x Optical cell in BM URSA 4K PL-bmursa4ksppl3reduced.jpg   METABONES 0.71x Optical cell in BM URSA 4K PL-ursa-4kv1-speedbooster-internal-assy.jpg  

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