Better in low light, it has a tad less noise at higher ISO, but less frames-per-second than the D300.
I use one to backup my D300s, although sometimes I feel the D300s is the backup, depending on the venue and/or event. For low light I use a D700 but I don't think you could go wrong with a D7000 if you won't miss the independant metering and focus mode selector switches, and a couple other features I'm probably forgetting at the moment.
The sensor is a step up, but I find the autofocus system marginal for low light action shooting. I haven't used the D300, so I can't compare directly, but compared to the D3 I get frustrated with the D7000's AF. If I were you I would solicit opinions comparing the two AF systems.
Are you using Nikkor lenses? I haven't had a problem acquiring focus quickly with the D7000 in low light such as the types used onstage for music/band performances (red, blue gels, some hot lights) or in coffee shops with the house lights turned down.
Yes, I'm using AF-S 24-70 f/2.8, AF-S 70-200 f/2.8 and AF-S 400 f/2.8. But the subjects I'm shooting are moving a lot faster than stage performers. I'm talking about football, basketball, etc. In addition, AF-C tracking is a critical issue since such subjects are in continuous motion. Since those are the kind of subjects the OP is talking about shooting, I think my experience may have some relevance.
I apologize, I wasn't discounting your experience and you're right, sports players move much, much faster - of which I don't have any experience in photographing. Only competitive swimmers in broad daylight.
The MultiCAM3500DX is better for fast sports so the D300s which is a bargain used now would be a better choice. But all other aspects of image quality will be better on a D7000, not only due to lower noise and higher resolution but it can run in 14 bit mode and get 2.5 times the frame rate as the D300s in 14 bit. In 12 bit, the D300s is faster. Stan St Petersburg Russia
>I need to replace my D300 which is dead, with a used D7000 or >D300s... It will be a backup body or a third body with DX lens >on my sports shoots.... > >Anyone isuing the D7000 for action sports, I have been told >that the D7000 plays better in low light than the D300... > > >Mr. Vic
I have the D7000. I shoot a lot of Hockey. I use it in manual mode, 70-200 F2.8. Set Aperature to F2.8 or 3.2. Shutter speed to 1/250 or 1/320. Set Auto ISO to low- 100, high- 1600. I use 32gig, 90Mps cards, 14 bit, Raw. Short bursts. If you want to do a lot of shots in a row, I find in jpeg mode the camera can shoot 6fps easily.