Update: Phase One has released v 2.01 IQ Firmware to fix this problem. Read More.
We are investigating an issue with the Phase One IQ series, whereby the camera locks up and will not capture an image. The issue appears to only happen when using this combination:
- Phase One IQ back with 2.0 firmware
- Phase One DF body (confirmed with 1.21, 1.23, and 1.25 firmware)
- DF Body is in MUP mode
- A Schneider Leaf Shutter lens is being used (e.g. 80LS)
- The Leaf Shutter is being used
We are unsure if this affects all IQ backs or just the IQ180. We are unsure if it affects all units or just a subset.
Based on our investigation so far) this only occurs when the Leaf Shutter is being used. This means as a workaround you can use the custom function “Shutter in” accessed via the DF menu of the IQ back to disable the Leaf Shutter and use only the focal plane shutter. Of course if use of the Leaf Shutter is critical to your application (e.g. you need fast flash sync) this workaround will not be acceptable.
For now we’d recommend DF users to hold off on the 2.0 firmware update if they ever (even rarely) use mirror up mode.
Update: 12:45pm
Phase One is aware of the issue and has posted 1.47 firmware to allow users affected to downgrade. They promise a revised 2.X firmware “very soon” to correct this issue.
If our customers have any questions about this they are of course welcome to call or email. Or just stay tuned to this page as we learn more.