Sony FDA-EV1M lever The Gossen Colormaster 3F is

The Gossen Colormaster 3F is a sophisticated digital meter for flash and ambient light that measures colour temperature (in degrees and filter correction values) and light intensity (in lux or lux seconds)

so if you're using it for flash work you'll need a separate cable (not included) to connect the flash to the camera

if you just want to pan smoothly

Diaphragm is snappy

and a little screwdriver for adjusting RF calibration (if necessary)

Sony FDA-EV1M lever The Gossen Colormaster 3F isThe Sony FDA EV1M is a slip on EVF for select Sony cameras, including the RX1 (among others). It features a 2. 4 million pixel OLED, 90 degree tilt function, and plug and play operation. In excellent condition, with only minor cosmetic wear, good function. Includes leather hardcase.