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 Nikon D40 autofocus weirdness 
 
 
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Old 03-08-2008, 09:25 PM
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Nikon D40 autofocus weirdness

Here's a question for the photographers here.

A friend of mine has purchased a Nikon D40 with the standard Nikon 18-55mm kit lens, plus a Sigma 55-200mm lens to go with it. Firstly, the Sigma lens says "For Pentax" on the box, and it sure doesn't fit on the lens mount on the D40! That's just the wrong lens, right? There is a Sigma 55-200mm lens that works with the D40's auto-focus, isn't there?

That's the first weird part.... the second is that the kit lens, a Nikkor DX 18-55mm 1-3.5-5.6G II ED AF-S (I just wrote down every bit of information I could find) won't actually take photos when the switch on the lens is on "A" for auto (focus). On "M" for manual, it'll take a photo, but it's not in focus, and I have no idea how you focus it, since the only adjustable "ring" on the lens is zoom. Is this the right lens for the auto-focus mechanism in a D40? Has the salesman given her 2 lens that don't actually work with the camera, or is there another issue with the Nikkor lens that could explain why it won't auto-focus?
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Old 03-08-2008, 09:28 PM
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The very end of the lens does turn to focus. It's not marked, but it does turn.
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Old 03-08-2008, 09:29 PM
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Yeah, if it says "For Pentax" on the box, its for Pentax, *will not* fit on a Nikon camera.

To Nikon D40 has no auto-focus screw, so it uses electrical contacts to focus. However, the AF-S lens should work fine when in AF mode on that body.

Take them both back to the shop with the camera adn find that salesman. He should give you a Nikon mount lens to replace that Pentax one. The other Nikon lens could simply be foobar.
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Old 04-08-2008, 05:37 PM
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Quote:
Originally Posted by decryption View Post
Yeah, if it says "For Pentax" on the box, its for Pentax, *will not* fit on a Nikon camera.

To Nikon D40 has no auto-focus screw, so it uses electrical contacts to focus. However, the AF-S lens should work fine when in AF mode on that body.

Take them both back to the shop with the camera adn find that salesman. He should give you a Nikon mount lens to replace that Pentax one. The other Nikon lens could simply be foobar.
It wouldn't surprise me if the lens was buggered, since this was their last D40 that they were selling off as a "last of this model discount".

So when it comes to the AF on the Nikon lens, there's nothing to adjust or set or configure except for the big-ass A-M switch on the outside grip?
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Old 04-08-2008, 05:41 PM
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Wow, I got the same deal on saturday. How much did your friend pay for the kit? I paid $569.
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Old 04-08-2008, 05:46 PM
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Quote:
Originally Posted by haydio View Post
Wow, I got the same deal on saturday. How much did your friend pay for the kit? I paid $569.
A touch more than that, but this was in a country town where things rarely go much below retail.
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