@StarScream -
>> "Im sorry, I don't get the connection between metering and the DOF button?"
There are lots of resources online that explains the technical details.
>> "Yes, Nikon's entry level bodies are crippled because of their need for AFS only glass for full compatibility"
This "need" is an artificially introduced handicap. All that's required for the base models to meter with MF lenses is the provision of a metering prong in cam body (as it exists in D200 and above) that mechanically links the body to lens. Nikon deliberately removed it from all bodies below D200 (now D7000)
Also, the same coupling can be achieved electronically as well, as this D40 user has proved -
D40
He went ahead and conducted a brain surgery on his D40 to get full metering support with ALL nikkor lenses ever made.
Video of D40's behaviour after the brain surgery.
Part 1 -
Part 2 -
If he can do it, why not Nikon?
So, the "cripping" you mentioned is a pure marketing decision.
>> "But Nikon's logic goes like this - people who have a lot of manual AI/AIS glass are pros who tend to buy the top-end bodies"
Skewed logic, at best.
Pentax/Canon does not think this way, thankfully.
An elderly gent who enjoyed the best of Pentax optics decades ago as an enthusiast can safely gift his grandson his precious lenses with the assurance that they will continue to be enjoyed in the same manner on his grandson's latest entry-level Pentax DLSR. What satisfaction for both parties involved!
A nikon grandfather would probably throw away his collection in to the garbage bin. Sigh!
>> "Folks buying their first SLR usually don't have legacy glass issues."
Wrong assumption. Suppose an elderly hobbyist used to a Nikon EM body (an amateurish, plastic-bodied Nikon film SLR, considered bottom of the heap during its day) with AI/AIs lenses upgrades to a bare-bones D40 (a natural upgrade from film to digital for his level of sophistication, since he will not be used to manual exposure anyway on EM). What happens? He suddenly finds his lens collection unusable. Ofcourse, Nikon "warned" him of this fact.
Would you ask such a gent to go buy a very expensive D7000/D200 or above. That's basically what Nikon does.
>> "This has been the case since the film body days - there was a time when only the F4 could use old lenses"
Nikon FE/FM could meter with every lens created by Nikon (both pre-AI and AI; AIs wasn't yet introduced during FE/FM days). Backward compatibility broke when Nikon FE2 was introduced; this was because of the mechanical impossibility of mounting pre-AIs on FE2.
>> "the D7000, which is a $1,200 body meters with AI/AIS lenses."
And how many of us can afford a D7000

If you browse this thread, most of the queries are for D3100 and D5100 and comparisons to bodies in other systems.
Point here is not to find which body meters with old glass. It is about Nikons failure to maintain backward compatibility when it could have been easily achieved. They just turned blood-sucking leaches listening to some bean-counter churning out figures in Yen.
>> " I've mounted my 50mm/1.4 from my F2 on my D90 with no problems. "
Is that lens non-AI and does it look like this?
Nikon Nikkor-S Auto 50mm f/1.4
If so it must have been AI'd.
Coz without AI-ing, mounting a pre-AI lens on D90 will damage the body. Its a confirmed fact. But such lens can be safely mounted on a D40/40x/60.
Pre AI and the D90: Nikon SLR Lens Talk Forum: Digital Photography Review http://www.flickr.com/groups/365610@...7606979156690/ Can one use old lenses with a D90? - Steve's Digicams Forums
>> "There is a reason why Nikon outsells Pentax."
True, and it has nothing to do with optics and everything to do with the enormous war chest Nikon has to fight marketing battles.
And also due to the fact that Pentax doesn't feel the need to expand to emerging markets like India. Sigh! Sigh!!