D7000
The 7000 was with me as an amateur photographer for about 3 years with about 25,000 trips in use. 90% of indoor sports, volleyball. Faster shutter speeds (1 / 500s), at ISO 1000, exposure compensation (+5.0) and bright F2.0 aperture with fixed focal lengths were the minimum requirements in order to come to some extent to make ends meet. The result: The shutter speed was no freezing of the images, for example, to after the attack.. This motion blur was still acceptable because you could incorporate the dynamics of sport in the images. Due to the lighting conditions, the focus had difficulty in the relatively dark areas. From ISO 1000 the noise was clearly visible and uncomfortable. Depending on the lighting and glazed panels inside the hall on the day I had to get 100 usable photos, min. 300 times press the shutter button. So a gamble! With the very low resolution of the DX-format with this picture quality image details were definitely not to use. The shortcomings of the recording were only exacerbated. Digital post-processing is only possible with a lot of effort.
D610
Already in the first series showed the strengths with the full-frame sensor and the improved noise performance over the D7000.
--- ISO 6400 !! ---
And suddenly, the problems and the limitations of the DX-format the table: Average I could achieve +5.0 best results with ISO 3200, 1 / 800s, f3.2, and exposure compensation. Bright, almost overexposed photos came to light. The criticized as too small Autofocus the D610 just fine. It works faster and more reliably than with the D7000. Due to the higher resolution in connection with the trip time are now body deformations! visible through the ball-acceptance by the arm. Dynamic contrast and change positively. In addition, you can now produce useful image details.
I had long hesitated with buying the D610. Completely wrong! As are worlds between D7000 and D610 as far as the high-ISO performance.
Absolute buy recommendation. More is better !!
I hope that I can help for all indoor sports photographers in their purchasing decision.
Link to my photographs with the D610 and D7000, see my profile.
In the series 14/11/2013 you can see pictures that have been largely !, 1 / 500s and f3.2 made with ISO 6400.