All Forum Comments
Comment by johnriley posted on Pentax M 24-50mm f1:4 zoom at 16/07/2007 - 12:48
Comment by johnriley posted on Poppy about to burst ! at 14/07/2007 - 19:21
Comment by johnriley posted on Refelective Lighting at 13/07/2007 - 20:35
It's much much harder to do a wedding on your own, so I hope someone will go with you to help organise both the photographer and the subjects. You can't think of everything at once...
Good luck.
Comment by johnriley posted on Pre wedding test results at 13/07/2007 - 18:03
Switching to vertical, meant short travel distance, therfore shorter travel time....(1/180 or even 1/200 sec).
Comment by johnriley posted on straining the "motor" on the k10d at 13/07/2007 - 17:15
This certainly fits in with the slower response of compacts and the interruption to viewing that occurs when a shot is taken. It's similar to the sequence of shutter events when leaf shutters were fitted to SLRs, such as the Voigtlander bessamatic of 1959.
Comment by johnriley posted on straining the "motor" on the k10d at 13/07/2007 - 15:34
At slow speeds the first blind opens, then after an interval the second blind closes and at some point the whole frame is open to light - hence electronic flash can be used at these speeds. This is all speeds up to and includung the "flash synch" speed.
At faster speeds the second blind is closing before the first one has completed its traverse across the frame, hence it is in effect a moving slit and the frame is exposed a bit at a time. The narrower the slit the faster the shutter speed. As the frame is never totally open, flash gives incomplete coverage and black blank areas would be evident.
Hope that clarifies it rather than clouding it....
Comment by johnriley posted on straining the "motor" on the k10d at 12/07/2007 - 23:37
But the "hybrid shutter" you mention is what I suspected, but I don't know for sure what the details are.
Comment by johnriley posted on straining the "motor" on the k10d at 12/07/2007 - 18:04
The exposure time is certainly via the shutter and the CCD receives its light all in one go - the information then exits to the processor in orderly lines.
As regards a compact camera, it can't have a shutter in the same sense, and I really must find time to research that properly.
Comment by johnriley posted on straining the "motor" on the k10d at 12/07/2007 - 17:33
Does anyone lnow definitively the answer?
Comment by johnriley posted on straining the "motor" on the k10d at 12/07/2007 - 16:04


It's absolutely useable but probably not as good as current zooms and certainly not as good as prime lenses.