Vision Research Phantom Flex4K, Manual

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Chapter 9: Accessories
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An important accessory for the Flex4K is a riser adapter
to bring the camera’s optical axis to the correct height
to work with standard 19mm bridge plates and common
35mm film accessories.
Vision Research manufactures a riser for this purpose that
mounts to the base of the camera. In addition to brining
the camera to the proper height for 19mm rods, there are
through-holes for 15mm rods for lightweight accessories
like lens supports and smaller matte boxes.
The part number for the Vision Research riser is
VRI-BRG-FLEX-LW-RISER
Alternative risers are available from other manufacturers,
such as a riser/shoulder mount combination from Abel
Cine.
The Flex4K and original Flex have the same
optical height from the base to the center of
the sensor, and the same mounting pattern on
the base, which means the same riser can be
used with both camera models.
Riser