there are deals like this one, brand new a7s for $1,800 
http://www.ebay.com/itm/171867486373?rmvSB=true
http://www.ebay.com/itm/171867486373?rmvSB=true
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canon and nikon cameras dont go down much and will hold their value pretty well
Is OK to gear-obsessed *and* craft-obsessed? I still try to make each project I do better than the last, and feel like I'm always learning. I avoided jumping on the 4k bandwagon for several years now, but finally feel like there's a form factor and picture quality I'm familiar with, like a lot, and works internally, so I jumped. But I have to admit to loving the gear, it's a problem.
I've also met very few cinematographers obsessed with cameras. To them, the camera is one of the least important elements in the equation.
If only everyone was as craft-obsessed as they are gear-obsessed. 14 stops of dynamic range isn't going to make your story more interesting.
Tomorrow's camera isn't going to help you make today's film.
I think it depends in the world you circulate in. If you come from 400ISO stock with 10stops and just light everything like that is what you are shooting with (and that will usually mean a wagon of HMI) then.. who cares about the camera.
But if you a shooting without that wagon of HMI then.. the camera becomes worth thinking about.
To me 10bit log (or fatter) make a huge difference to what I can do given a small lights package compared to a narrow DR camera.
S
These are all interesting questions, and I don't want to sound like the old guy standing in his front yard yelling at the kids to get off his lawn. But for a long, long time, filmmakers and storytellers have been making beautiful, engaging films with lesser cameras than we now have at our disposal. We have seen an explosion of highly-capable, low-cost digital cinema cameras flood the market in the last four years. And yet, if you look at the "User Films" section of the site, and at the recent DVX Fest entries, you'll see less and less work getting posted, with a drop in feedback from other users. We see less traffic to the Cinematography and Directing forums, while people flood the camera-specific forums. When all we had was the DVX, people were far more engaged in craft, because they realized they needed to be to get the most out of the tool available. Now, there's a new camera sub-forum every other week, while cobwebs grow in the craft forums.
There's sort of a wave of 4K cameras coming out, each outdoing each other in these 3-6 month intervals. At some point, it's going to plateau, since we're rapidly approaching the (average consumer) display limitation. I mean, once you got your 13-14 stops and 4K, getting to 15-stops and 6K represents a very marginal improvement.Maybe this should act as a cautionary tale for those thinking about dumping their year-old A7S for the next new camera--THAT camera is likely going to drop a similar percentage a year from now too.
Just be glad you didn't buy an f3!