1. Does the bulb mode exists in any of the recently introduced phase one or Hasselbald DMF ?
Mamiya AFD1, AFD2, AFD3, Phase One AF, Phase One DF all have a BULB mode under "manual" exposure mode. A traditional cable release can be used, or an electronic cable release can be used.
A limitation for long exposures exists for each digital back. This is usually NOT a hard limit (e.g. "1 minute" does not mean 61 seconds won't work but 59 seconds is perfect), but rather a point judged to still be good quality. It also depends on your needs, since one person's "slight noise" is another man's "unacceptable noise".
Phase one limits:
1 min - P65+/P40+
1 hour - P20+ / P21+ / P30+ / P45+
Several min - P45 (non plus)
30 sec - 1 min - P20, P25, P30 (non plus)
This limitation also is effected by ambient temperature. A P45+ in a cold desert night can expose for several hours.
Doug Peterson
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