There's really not very much an end user can do to adjust these lenses. They are precision mechanisms with small, moving parts and optics that all must remain free of dirt, dust and lubricants. Attempting to disassemble the lens could render it inoperable instantly - or down the road due to contaminants from handling.
Bring the camera and lens to a reputable camera shop if one is close by - or contact Nikon Factory Service to arrange for professional evaluation. Most Nikon lenses are protected from failure due to workmanship, etc. for 5 years with a copy of your dated sales slip (or other proof of purchase). If not covered by warranty due to age or handling, you will receive a price for repair and request for authorization for work to be completed. There is no charge for a repair estimate. You can choose not to make the repair and only be out the cost of round-trip shipping.
Good luck!
SOURCE: Compabilty Nikon 70-300mm/f1:4-5.6G with KENKO 2 X TELECONVERTER MC4DG
Having a 'DG' in the name of the converter tells me, Yes...
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: I dropped a Sigma 70-210 AF Nikon mount zoom lens.
sigma af apo 75-300 zoom lens gone cloudy inside front lens . can it be cleaned out if so how
SOURCE: Nikon 18-70mm f/3.5-4.5G AF-S DX Zoom Nikkor repair manual
The only problem with doing this repair yourself, is that upon re-assembly you will need the Nikon software and hardware to readjust and calibrate the lens.
Try sending it to PhotoTech Repair Service in NYC. They are Nikon authorized, and can do the repair under warranty if you still have it. Also if you join they're facebook page, they will give you a 10% discount.
Here is the facebook page link, it has everything you need to send it in.
http://www.facebook.com/pages/New-York-NY/PhotoTech-Repair-Service-Inc/102527215194
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