Quote Originally Posted by 87 Turbo II
But the D40 does lack the internal autofocus motor causing you to buy the lenses with them built in which costs more. All Canon DSLRS have lenses with them built in but they'vebeen in production since 1986 so you have a lot of cheaper options.



Then why would Pentax advertise that allof their lenses fit AND work?

Type/construction - PENTAX KAF3 bayonet stainless steel mount; Usable lenses - PENTAX KAF3, KAF2, KAF, and KA (K mount, 35mm screwmount, 645/67 med format useable w/ adapter and/or restrictions); SDM function - YES; Power zoom function - n/a
Yes, the CAMERA lacks a coupling gear that drive the AF lenses in/out. but the AF-S LENSES all have gears. I was talking about the lenses. But yeah, the D40, D40x and D60(i think) do not have that coupling so you have to use a AF-s lens. The D50 and above have the coupling so you can use AF lenses.

For the pentax lenses, you're right the last batch of manual lenses that were made in the 70's will manual focus on DSLRS. but any before that will not.