Sat 22-Sep-12 12:40 PM | edited Sat 22-Sep-12 12:58 PM by DavidHarsay
3. There are a large number of seasoned pro photographers who have one or more D300's or D300S's, who use them so much that they are getting somewhat worn out. They would plan to have an appropriate replacement, and the construction/durability matters. There really are a lot of these people. On the flip side, the camera is really durable and it lasts, and some will continue to use them.
4. I see earlier career professional photographers, many with very limited budgets, and it's very common to see them with D90's. They are not so much into the technology sometimes, just looking for a good tool to take great pictures. If they haven't seen enough from the D300s and the D7000 to compel them to upgrade, and they are comfortable with the DX lens investments, many would would be in the market to invest in a body and make a jump where the D400 is the appropriate step.
5. People transitioning to a semi-pro or serious enthusiast level in their skills and interest... Digital photography is growing fast (the cellphone growth is helping this), and there's a market segment which would choose to spend in the $1600-1700 range for a well built semi-pro DX camera.