Hi Richard, The back needs to be set for long exposure. Check the manual or contact phaseone for instructions on how to set it. Frand ----- Original Message ----- From: Richard Man To: hasselblad@xxxxxxxxxxxxx Sent: Tuesday, February 01, 2011 3:05 PM Subject: [HUG ] B Setting on P30 back with 503CW Thank you for the advice re: B setting. It's indeed a defective lens. I am renting a 50/CFi lens locally and it works fine.... until the B setting: **** I am having trouble with the 503CW and a P30 back (not the P30+). The images are fine all up to 1 sec (or at least after I found a lens without lens shutter issue with low speed). However, with B, first, it always terminates no more than after 5-6 secs even if I hold the shutter release down longer, and second, it never seems to obtain an image. I have checked the B setting does hold the lens shutter open by removing the back and raising the mirror so I can see through the iris. The lens shutter seems to operate as it should. I tried two different sync cables with the same result. I also tried raising the mirror and again the result is the same. Any idea? I know the P30 back doesn't do as low light as the P30+, but it's almost like hardly any light is admitted. Thanks. -- // richard <http://www.imagecraft.com/> // icc blog: <http://imagecraft.com/blog/> // photo blog: <http://www.5pmlight.com> [ For technical support on ImageCraft products, please include all previous replies in your msgs. ]