Re: D200 vs D300 at ISO 1600

Colin_D wrote:

> The *only * situation that blows a channel - any or all channels - is
> overexposure at the time of taking the shot.  If the photon wells in
> the chip max out, then the channel is blown; if they are not maxed
> out then the camera will not blow a channel.  In-camera settings do
> not have any effect on RAW files - at least with Canon cameras.  You
> can blow a channel in Photoshop  with levels or curves, however, but
> don't confuse that with the raw image.

BINGO!!!  We have a winner!  Since both Nikon and Canon use WB as a factor
in calculating exposure *BEFORE* the shutter is pulled you still can have
a
blown channel(s) prior to the RAW has been created.

> I understand that (some?) Nikons throw away image information in
> compressed NEFs, but Canons do not do that with their CRW files. Canon
RAW
> files are not affected by any of the in-camera settings;
> they only come into play if you are shooting jpegs.  What Nikon does
> with their RAW files is anyone's guess.  Possibly the thrown away
> data in NEFs could influence the output from those files.

Sorry Collin, both Nikon and Canon do it pretty much the same way when it
comes to using WB when calculating exposure prior to the shutter's release
and ultimately storing the RAW file.





Rita