Originally posted by normhead I don't know your needs or your budget... I see people get great club shots with a K-x. But you don't get them with a K-30, so maybe you need a D3s, no noise up to 25,600. Or maybe a D3 is it for you. But, most of the wedding guys that post here prefer FF for the low light performance. So why would anyone convince you to buy a K-3? Are you hoping we'll tell you the camera is better than it is? What?
If you're going Nikon you need to go at least with the D3s, not D3, unless you're looking at APS-C.
Originally posted by mee Have you considered a D610 if you are wanting a FF Nikon body? I mean, what does a D3 specifically bring to you?
It looks like the D610 could work too.
Either way (Pentax or Nikon) you still need to get the right glass.
In Pentax, you need to be looking at the DA*55, FA*24, FA31, or FA77 (depending on the Focal Length(s) you want). You could also consider the FA*85, the DA35/2.4, possibly the FA43 (its aperture is a bit slow in practice), or various Samyang lenses (if you can go with MF); for example the 85/1.4, 24/1.4, 16/2.
I think you need to shop for lenses. If you're looking at other brands, then pick some lenses you love and then get a body that goes with them.
All Tests / Reviews is a good place to start. All the DSLR makers have some very good glass. Sony Zeiss has some outstanding glass (such as 16-35, 24/2, 85/1.4, 135/1.8). Fuji now has a small (but impressive) set of lenses.
But it'll be easier (and probably more economical) to just get another Pentax lens or 2 first. And you already have one of the best DSLR lenses anyone makes in the DA*50-135. But it's not fast enough for some indoor situations.
The only significant reasons to upgrade to a K-3 right now (or a K-5 II/IIs) is if your AF is too slow, or you need a battery grip because you're taking 1000 shots a day in portrait orientation. But the AF is already supposed to be reasonably good on the K-30.