The AF lenses will likely still be able to meter correctly, and I don't see how this would be affected in the D40. I think Job is right when he presumed that manual focus with AF lenses would still work on the D40. They would work and likely meter correctly, but not autofocus.
The jury is still out on this for now.
The point I am making is that there are an extra 5 contacts on an AF-s (VR - the 18-200VR) lens, compared to AFD lens that I looked at. It is possible for Nikon on the D40 to limit use of any lens that has only five contact points.
IIRC Nikon has done limitations in the past. IRC a 35mm "entry level" SLR that required the aperture to be changed "electronically" (think AF-G mount lenses), not by the aperture ring.
You're right, but as long as they commit themselves to releasing all new lenses as AF-S, and slowly switch over the ones that currently aren't, they might be ok.
Times move on as a Nikon rep once told me.
I believe that all new Nikon lenses will be AF-s or at least AF-s compatible. Meaning that the likes of a Nikon PC lens in the future will work with AF-s only bodies.
I hope they don't kill off their 35 mm lenses. I think I'd switch to another company if Nikon were to release DX lenses exclusively from now on.
I'm under the impression that Nikon will eventually use a FF sensor. It really think it's a matter of time before every company has to, unless there's some miracle sensor that can somehow suppress noise entirely (not likely to happen) while increasing sensitivity. It's pretty much why I don't expect Olympus and the 4/3rds group being around for a long time......not unless this miracle noiseless, super-sensitive sensor technology is discovered within 3-5 years or so.
Sony makes FF sensors, so it's really a matter of time before Sony uses it. I'm guessing Nikon will follow suit and purchase them.
Only time will tell about the viability of the FF sensor. If you read some of the Canon forums; there is a great cry for digital specific wide angle zoom and single focal length lenses in order to get better corner detail and vignetting under control.
But in the end it is the debate about format changes that I have posted about before that is at issue.
Photographic history is full of cries of the loss of a beloved format, and what it would do to photography in general. From the early days of photographers shooting 11x14 or 8x1, and the woes they sang as 5x7 and 4x5 started to move in on their turf. That gave way to 2 1/4x3 1/4 sheet film, and soon after the move to MF film. MF users cried foul when Oscar Barnack came out with the original Leica UR using 35mm film. Or when Kodak came out with the original Brownie camera.
Each move towards new technology was met with cries of despair from those that found comfort in their "old" technology. The difference I see today is that we seem to feel we are more "entitled" to try and keep our comfort level the same.
Never before the 1940's or 50's, have photographers felt such an entitlement to keeping their same gear as technology has marched on. may be it is time for us to look at the camera as a tool. And pick the best tool to do the job.
In the end it means picking a format that meets your needs. Nikon, Canon, and others never promised that you would never need to make a change in gear or formats.
The longevity of the 35mm format has us spoiled. Making us feel as we are entitled to use our 10+year old lenses forever.