I have been wanting to discuss this for a while ... just read that @MSMOTO
now uses a D800E as a D300S replacement. I guess its bec we still have not got a D300S replacement and people have moved on to get that functionality. I myself have gone with a D610.
However, there are a whole bunch of advantages of using DX glass on FX cameras.
Many say upgrading from DX to FX is a huge pain bec you HAVE to get FX glass. I say no, DX glass works just as good on FX as it did on a dx camera. Why would you upgrade lenses that have worked well for you?
Maybe its just me but using crop mode is fine .. you see this rectangle in the viewfinder and just shoot to frame the picture within that rectangle.. no big deal!
I have been using my super zooms in DX mode on my D610 and the images are generally as sharp as when used on my old D7000 maybe even better. Images are definitely better due to the colours and DR and High iso. I also have the option to go to FX mode with the idea to crop later. My 18-xxx now becomes a 16-xxx !! my 12-24 becomes a 10-XX. I can also compose in square crop or 4:5 crop and get higher number of MP than in DX crop.
The High ISO capabilities of the FX sensor is also a nice addition to shooting with DX lenses. When the MP went through the roof, didn't we complain and wanted a 10MP high ISO DX camera? well I have that 11MP in dx crop mode in the D610 and love it!
For those saying 10MP is not enough MP even on DX cameras, well look at the DXO measurements. Most DX lenses are about 5-6 PMPX a really good one is 8-10 PMP. Generally well below the capability of my D610 in DX mode! (not to mention the D800E) and looking at the images that I have been shooting with my DX lenses I concur with the DXO measurement.
For general photography the D610 provides more functionality than most DX cameras. The exception would be when used with High IQ tele glass for wildlife. however, I love using my D610 with my DX lenses.
Moments of Light - D610 D7K S5pro 70-200f4 18-200 150f2.8 12-24 18-70 35-70f2.8 : C&C very welcome!
Being a photographer is a lot like being a Christian: Some people look at you funny but do not see the amazing beauty all around them - heartyfisher.