Well, no, there are very few prime lenses (except very long telephoto ones) that can autofocus with the Nikon D40 or D40x.
They have a 300/4. I think on the consumer side they're relying on the 18-$foo ultrazooms (and probably rightfully so.) I have yet to look at the $foo-70's on the pro side for image quality against the venerable 35-70, if they stack up though that's the only other staple lens that's still AF-D.
However one can certainly put ANY of Nikon's lenses, including AF, AI and AI-S ones, on the camera and manually focus........
Harsh
But true. All else being equal, CCDs will produce less noise. The extra internal electronics required at each pixel of a CMOS sensor makes the photosensitive part of each pixel smaller. The photo-sensitive part of each CCD is bigger, and obviously takes in more light. CMOS progression will hit a wall faster than CCDs because of this. Microlenses placed at each site minimize the difference, but doesn't eliminate it.
Canon is successful with their CMOS technology because they have a patented way of reducing noise, and I don't think anyone else is allowed to use their method. So even if you make a fantastic CMOS sensor, doesn't necessarily mean you're going to get noise levels comparable to Canon, or the large majority of CCDs.
They're cheaper and easier to make.Nikon's latest crop of sensors (D300/D2X/D3X) are all CMOS-based. I imagine there's a good reason for it.
They're cheaper and easier to make.
He's right about the noise, in principle, CMOS sensors are worse, although I wouldn't really care about anything, but the results.
The D40/D40x doesn't meter AI/AI-S lenses. From the Nikon USA site:
Compatible Lenses*1: Nikon F mount with AF coupling and AF contacts Type G or D AF Nikkor
1) AF-S, AF-I: All functions supported
2) Other Type G or D AF Nikkor: All functions supported except autofocus
3) PC Micro-Nikkor 85mm f/2.8D: Can only be used in mode M; all other functions supported except autofocus
4) Other AF Nikkor*1/AI-P Nikkor: All functions supported except autofocus and 3D Color Matrix Metering II
5) Non-CPU: Can be used in mode M, but exposure meter does not function; electronic range finder can be used if maximum aperture is f/5.6 or faster
6) IX Nikkor lenses cannot be used
*1. Excluding lenses for F3AF
Regardless of auto/manual focus or auto/manual metering, these lenses can still be used on Nikon cameras of any generation.
You young folks don't appreciate that there was a time when we had to --gasp! -- not only manually focus all of our shots but we had to also use an external meter, too......
Guess what? People managed to produce nice photographs anyway!
Up to a point, I'd agree. The D3 (and the D2x, a copy of which I've had for 2.5 years) are not particularly sensitive to cost. These are pro bodies, and cost is secondary to image quality.
I'm not a sensor engineer, so I'm not going to try to make a technical argument for a device that is outside my area of expertise. I will unequivocally agree with your last statement - it's all about the results.
On the other hand, while the lack of autofocus is something most people should be able to deal with, the lack of metering isnt something your typical user would be able to use very well.
No, I was thinking a full-frame fisheye. The one where the photo isn't in the shape of a circle