Why don't they make all DSLRs with an electronic shutter? Is it technically possible?
Surely this would allow easier syncing with flashes (rather than the usual 1/200s or 1/250s max).
I could even imagine a special RAW format that basically recorded all data from the CCD for, say, a second and then in software you could retrospectively shorten that time window. eg. only use data recorded in the first 1/100h of a second...
Or am I being stupid?
Answer
Sounds nice but apparently there are currently some technical limitations:
An electronic shutter requires the sensor to be equipped with what is commonly called "snap shutter" circuitry. Basically, this is a second set of diodes, as big as the light gathering photodiodes, but shielded under a dark cover, and some additional switches. To shoot, the photodiodes are cleared of charge, exposure starts, and at the end of exposure, the charge in the diodes is transferred over to the shielded storage part of the cell. The cell is already full of stuff, so the only way to make space for this extra circuitry is to cut the size of the photodiode in half. Which cuts dynamic range and low light, high ISO performance.
Source: Joseph Wisniewski
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