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.
Could be as simple as dirty electrical contacts on the lens, camera or both. Try cleaning them with a pencil eraser. Also, there is a focusing motor in the lens and circuitry in the camera. Do other auto focus lenses work on your camera? If yes, it is your lens. If no, you have a camera problem. In either case, I would take it to the Nikon repair center in your error or to a qualified camera repair man. You should not try to disassemble the lens or camera yourself under any circumstances. Reassembly is not a matter of simply reversing the disassembly process.
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.
Dust and other small debris is drawn into the lens due to the vacuum
created when zooming in. You can reduce the chances of drawing in dust
and debris by slowly zooming in as opposed to rapidly zooming in.
Now that you how it gets in and how to help prevent it from getting in
again, comes the bad news. There's really no way to disassemble the
lens to clean it up at home. These are precision optics with many small
moving parts that really need to be serviced in a dust free
environment. You best bet it to contact Tamron (or authorized servicer)
to learn how much it will cost to be cleaned by them. This will keep
the warranty (if any) intact, 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.
Sigma will not repair this lens as the fungs may be in the lens on the barrels and if thay could clean
or replace optics the fungs may come back so thay cannot give a guarantee I know someone who
cleans lenses let me know if you want to contack him
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