If it does not fit, you did not purchase for the correct model Nikon
If you got a lens with a Nikon mount then you don't need anything else to fit it to a Nikon camera.
Testimonial: "I also purchased a Fotodiox Lens Mount Adapter, Tamron Adaptall II Lens to Nikon Camera. The Tamron lens still will not fit."
SOURCE: 135-400mm lens on nikon d40
Unfortunately, this lens is not supported by the D40 due to Nikon's unfortunate decision to leave out the autofocus motor from this camera. This is why I tell folks not to waste their money on the D40 - access to the many, many, many lenses that Nikon has made over the years, many of which are available used for a substantial savings, is lost on this camera. The only Nikon lenses that work are AF-S lenses, and some third party lenses that have their own internal motors. I got a list of Sigma lenses that are compatible with the D40 for you:
The list of compatible Sigma lenses for the Nikon D40 as of the current date is as follows:
from here: http://www.imaging-resource.com/NEWS/1177682545.html
Sorry for the bad news. The cheaper thing at this point may be to sell the D40 and get a D80. I personally have a D70S, but that is no longer made.
SOURCE: Does Tokina-12-24mmF/4Pro DX complies with Nikon-D3 FX Format
Barrel distortion like you describe can always be a problem, especially at ultra-wide focal lengths like yours at 12mm. Some of this can be compensated for in software... Adobe Photoshop CS2 and Elements do a reasonable job, IMO, Bibble Pro (www.bibblelabs.com) does even better, especially with the 3rd party plugins like Percy perspective correction. These are things we have to live with when we have smaller sensors and ultra-wide angle lenses. There is nothing wrong with your lens, you will probably find that this distortion is minimized if you use a longer focal length (say 14mm) and/or stop down the lens a bit.. try f8, wide angle lenses have huge depth of field.
SOURCE: Tamron 28-300mm Model 185D Auto Zoom on Nikon d40
Autofocus function on the D40 only supports lenses with the
AF-S feature, which have an autofocus motor built into the lens,
instead of using an autofocus motor drive built into the camera.
The Tamron lens you have, does not have a built in motor and
the autofocus function relies on the motor drive in the camera.
It will not work with the D40 or D60, but it will work with other
Nikon digital SLRs, such as the D80. Need to get an AF-S
type lens or upgrade to different Nikon digital SLR. Unless
you do this, you will have to manually focus the Tamron lens.
All of the Nikon DX (for digital) series lenses are also AF-S
type, so they will work with the D40, which is designed as
an entry level digital SLR, therefore it is intended primarily
for use with DX lenses, which are typically sold in a kit with
the D40. Most common one is Nikkor 18-55mm DX AF-S.
Other Nikon AF-S lenses made for film cameras (FX type)
will also work with the D40, but these tend to be expensive
professional models. DX series lenses tend to be more
affordable. You might consider the 18-200mm DX AF-S
as an alternative to the Tamron, but these are not cheap.
SOURCE: NIKON D80; Nikon 18- 135 G LENS, Camera doesn not recognise lens
try to clean the contact of the lens & camera
SOURCE: I am using a Tamron AF 18 - 250 mm lens on a nikon
Make sure the lens is set for the largest f number on the aperture ring. there may be a lock to prevent the ring from turning in the future. Locking the lens of the largest f number allow the camera to set the lens through the camera. This is normal on most of the newer cameras.
If the lens does not have a move-able aperture ring, then dismount and remount the lens, making sure the lens is completely mounted and locks into place, completely lining up the contacts inside. If this does not work The camera or lens may need servicing.
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