I recently acquired a second-hand Booster1 probe (525.11) to take advantage of the film plane metering capabilities of the Sinar backs.

One issue is puzzling me. When I am metering a 18% grey card with the probe, I am getting a +1EV difference compared to the reading I am getting with a Minolta Spotmeter F. The difference is consistent (+/- 0.1EV) across all the DB lenses I tested.

To all Booster1 users on APUG: are you experiencing a similar metering shift with your probe?