I often have problems with bright highly-saturated reds, like this.
This image is better than I can usually get, but you can still see
some loss of detail and texture in the lower petal and throat of the
flower.

I've done some research trying to find the cause and cure for this,
but so far I haven't had much luck. I thought that one thing might be
interference from the infrared spectrum, and I added an
infrared-blocking filter, but that hasn't helped. I saw another
reference that implied that ISO might be a factor, but I haven't found
any relationship there in my own experiments. My next hope is that the
newly-announced 14-bit color channels in the latest Canon and Nikon
cameras will deal with this, but I don't know.

Any ideas?
JD