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Many of the lens i (newbies) saw in internet and my friend said that other lens some cant autofocus on D40..?
Why Nikon not build some more option for D40.. i ask this because i want to find suitable and moderate cost of buying themm

It's a small number of lenses that will not focus on the D-40. In general it's the older stuff that doesn't have it's own focus motor. I'm fairly certain the current AF-S lenses will all work on the D-40. The D-40 does not have an AF motor in the body.

Probably the best moderately priced all around lens you can buy for the D40 is Nikon's 18-200 AF-S VR. It's fairly wide and zooms in pretty far. It has it's problems, what lens with such a range wouldn't? But for all around use you can't beat it.

fixnikon wrote:Many of the lens i (newbies) saw in internet and my friend said that other lens some cant autofocus on D40..?
Why Nikon not build some more option for D40.. i ask this because i want to find suitable and moderate cost of buying themm

Only AF-S lenses will autofocus on the D40. Sigma has HSM lenses that should also work, but that's about it. The options are limited, and fairly pricey for the most part. The cheapest Nikon lenses besides the kit lens you can get are the Nikon 18-70, 18-135, and 55-200. After those, they go up drastically in price to ~$800 for the 18-200, $1000 and up for the likes of the 12-24 DX, 17-55 DX, 28-70, 80-200 AF-S, 300/4 AF-S, and the 70-200 VR.

Most of the Sigma lenses with HSM are telephotos and macros, excluding the 10-20 and 30/1.4

daor79 wrote:

fixnikon wrote:Many of the lens i (newbies) saw in internet and my friend said that other lens some cant autofocus on D40..?
Why Nikon not build some more option for D40.. i ask this because i want to find suitable and moderate cost of buying themm

Hmm I'm wondering what is up with all the odd links embedded in the OP......

Yes, that's quite interesting isn't it? All different links. None were in the original post, just the quoted reply. The links go to pages that are all in Vietnamese.