Hoping not to arise an already answered question (I did not find it in my search), but, reading hundreds of reviews, I grew to believe that the relatively slow flash sync of -e.g.- the D2X and many C@non DSLRs had to be referred to the use of a CMOS sensor instead of a CCD like the D50/D70, both of which sport a nice 1/500.
Now, I am among the ones who have already ordered the D200, but it is not clear to me why we have a CCD and 1/250 flash sync?
PS: I see -due presumably to the recent crash- that I'm back to "1 posts", I had not many but a few more so don't take me as a troll
#1. "RE: 1/250 sync and CCD?" | In response to Reply # 0N80 Charter MemberThu 03-Nov-05 12:35 PM
I'm not an expert but it is my understanding that it has to do with the shutter construction and possibly due to a more robust and longer lasting shutter. Someone please correct me.
My Nikonians Gallery is here:
#2. "RE: 1/250 sync and CCD?" | In response to Reply # 1HarisAshraf Registered since 21st Feb 2003Thu 03-Nov-05 12:51 PM
In order to implement electronic shutter each photosite on the CCD imager has to have extra circuitry. That adds complexity and takes space. Nikon may have decided to use that area for light gathering to lower noise.
#3. "RE: 1/250 sync and CCD?" | In response to Reply # 0
The D200 has inherited the double-bladed focal-plane shutter from D2X. This is to prevent issue with strong light sources, such as seen on the D70.
Since a mechanical shutter has inertia *and* a limit as to its highest travelling speed, the shortest exposure time for reliable sync is 1/250. You can do "hi-speed" FP sync up to 1/8000 just like the D2X, though.
#4. "RE: 1/250 sync and CCD?" | In response to Reply # 0
the D70 achieved 1/500 sync using the CCD's electronic shuttering ability. In fact, all high speed settings use the electronic shutter, not the focal plane shutter. Unfortunately at speeds of 1/4000 and up, the electronic shutter often creates a "plaid" artifact that severely degrades image quality.
According to Robgalbraith.com, the D200 uses the FP shutter to control all exposure speeds. That's why it has the 1/250 sync limit that's common to even the best FP shutters. But that also means that the D200 won't suffer from high speed shutter image artifacts.
Why CCD? It offers the best noise performance (contrary to CMOS myths that float around the web). CMOS is first and foremost less expensive to produce. It only recently has been engineered to performance levels that bring it into performance competition with CCD. I don't know why Nikon went CCD at this price point, but I'm happy they did.