The D100-D300 forum is the right forum to discuss the D600, since that is far the most likely one for it to be put in. If it isn't, that forum will die, like this one
http://forums.dpreview.com/forums/forum.asp?forum=1026
Not really. Being neither fish nor fowl,
Sure, it is neither fish nor fowl, it is a camera.
the D600 suffers from the same predicament as the D7000.
The D7000 does not have a predicament, it is a popular and successful camera, very well suited to the needs of advanced photographers who need such attributes as good weather sealing, robust build, full manual two wheel control, high frame rates, 100% VF, dual card slots, multi-point AF and all that good stuff.
Let's see ... D7000 body, D7000 features ... Bingo, D90-D40/D7000-D3000 sounds like a perfect fit!
They will probably have to split the forums:
- D90-D40/D7000-D600
- D300-D100
- D4-D1
- D800-D700
I would doubt it, it would be unnecessary duplication of forums. Even Canon DSLR's only get three forums. It also makes little sense to devote a forum to a dead product line. What makes more sense, is to go:
One wheel models (entry level, designed essentially for automatic modes with occasional forays into full manual), which in terms of the current lineup, will mean D3x00, D5x00 and for legacy cameras take in the D40-D60
Accessible two wheel models (designed for the advanced photographer, and priced so as to have a reasonably broad market)
D7x00, D6x0 and for legacy cameras, take in the D70-D90 and D100-D300.
Specialist cameras (high price models which because of the high price will have a more specialised and smaller market)
D8x0, Dx and for legacy cameras, take in the D700.
This is a pretty similar segmentation to the Canon lineup, which has all the Rebels in one forum, the xxD and 7D in another and the 1D and 5D lines in a third.
Just because Nikon's numbering system still doesn't make perfect sense in the hundreds, is no reason to make the forum lineup not make sense either.
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Bob