I bought 2nd hands lens, I already know that AF is fault that is way I paid small money, also I tried disassemble and cleaning lens, but even I try fix AF PCB, I can not fix, just I know PCB fault, so I try make PCB or buy, but I think I can not buy in the philippines, so I looking for circuit of lens.
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first off, you need special tools to get at the inner elements of a zoom lens - i've been working on lenses for 20 years, and i still don't have every tool needed sometimes :-)
second, makinon lenses are not really worth anything, even if they are in perfect condition - my advice is to buy a better zoom used that is in perfect condition already, since you would have spent that money in tools to try and clean this one, and everyone screws up the first lens they ever try to take apart...
some good lens brand names are sigma, tamron, kiron or any with the same camera name as your camera (canon, nikon, etc)
stick with japan made optics - can't go wrong usually.
Don't even think of disassembling it yourself!!!!!! Take it to a professional camera repair man and save yourself allot of money. I guarantee you that if you disassemble it yourself, you will not be able to reassemble it and the repair man will charge you much more then if you just brought him the lens in the first place.
Why do you think that the lens needs to be internally cleaned in the first place? It is very rare for so much dirt to penetrate the lens's interior that it actually affects the quality of the photographs. Don't over react to a few specks of dust between elements. The most important element to keep clean is the exterior surface of the rear element because that is where the light is most concentrated. Let a camera repair man tell you if your lens really needs such a drastic approach.
If the gears are stripped, it will require an experienced tech to repair.
That being said, there should be a small switch near the lens mount to switch between auto and manual focus mode's, be sure that that switch is pointing to A. When set to M, the little screw recesses into the mount so it doesn't try to engage, when set to A, it'll extend very slightly.
Also, Nikon has manufactured two types of AF lenses - with the motor in the body and with the motor in the lens, as with most newer lenses. Your camera should have a small screw on the lens mount that drives the focus motor between the lens and the camera, but I'm not 100% certain on that. Your camera can focus lenses with and without this type of coupling. BUT, if that screw/motor in the body is not functioning, you'll only be able to use lenses which contain the focus motor inside them, or manual focus lenses (you can manually focus AF lenses too).
i`ve once experienced the same problem as your, the reason was the motor in the lens. it couldn`t work normally to trouble shoot this, you should contact a professional service technician, and i hope the lens is still in warranty condition
As it isn't really a very special lens, I wouldn't pay for a repair, which is likely to be more than the lens is really worth (you will get back a repaired second-hand lens, which might go bad again). Better to put the money towards a nice mid-range zoom.
Your lens needs to be serviced before the fault causes excessive wear and expense. If it's still under warranty then make a claim, but otherwise the lens may just need a routine CLA (Clean, Lubricate, Adjust) service.
Do not attempt to repair this yourself: without specialist tools and knowledge you're likely to turn an expensive and serviceable lens into an unreliable money pit or even an unusable piece of junk.
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.
Here is Nikon's specs of lens compatibility for the D40X:
Compatible Lenses*: Nikon F mount with AF coupling and AF contacts Type G or D AF Nikkor: 1) AF-S, AF-I: All functions supported; 2) Other Type G or D AF Nikkor: All functions supported except autofocus 3) PC Micro-Nikkor 85mm f/2.8D: Can only be used in mode M; all other functions supported except autofocus 4) Other AF Nikkor*â¹/AI-P Nikkor: All functions supported except autofocus and 3D Color Matrix Metering II 5)
Non-CPU: Can be used in mode M, but exposure meter does not function;
electronic range finder can be used if maximum aperture is f/5.6 or
faster 6) IX Nikkor lenses cannot be used *â¹ Excluding lenses for F3AF