Canon EF-S 18-55mm f/3.5-5.6 IS II — a “whale” lens on many photo-cameras of Canon with a crop-factor.
This copy is a lens from the 4th generation (penultimate) of a “whale” lenses 18-55 series. It differs in sharpness, quite good for an inexpensive lens, and HA.
This lens is kindly provided by Oleg Malakhov for the purpose of his disassembling and check of contents. It is interesting to much how a lot of plastic is used in a lens (and whether there is a metal) and whether it has plastic or glass lenses. And also quality of fixing of elements and so forth.
Lens is not the worker, it has defect on one of internal lenses, but for our task it is unimportant.
I arm with a “hour” screw-driver of PH00 and a small folding knife.
To understand that this lens is inexpensive, it is enough to look at its bayonet joint — a bayonet joint is plastic.
Despite the low price, a lens has the image stabilization. However, Canon makes a reservation that it not the same stabilization which is used on expensive lenses Canon.
The second moment — a lens is made in Taiwan, but not in Japan, as the majority of the Canon lenses.
I turn off all screws of a bayonet joint (at the same time I check that nobody turned off it before me — a vent of screws are new, not damaged).
Now it became visible that two loops are pulled to a bayonet joint. One to the chip, is soldered, and the second can be taken out from the connector. We turn off the screws retaining the chip. They are on one side of a bayonet joint. We remove a bayonet joint.
We take out a loop from the connector and separate a bayonet joint.
The printed circuit board which is on top is fixed on silicone pro-rates (protection against vibration). We take out all loops from connectors on a board and accurately remove it. This board is a “brain” of a lens.
There was a mechanics and optics. Status of a back lens of a lens is deplorable. Some stains are visible. Perhaps, the lens visited dirty water.
At the left there is a metal plate covering focus control gearwheels. We remove it. It fastens on 2 screws. It is visible that gears are all from plastic. Moreover, they are fixed on a plastic panel.
We remove all levers of stabilizator switching and autofocus and we delete them together with a motor.
That we have as a result.
More screws aren’t present that suggests an idea that screws are hidden and it is necessary to look for them in other place. I remove an elastic band of a focus ring.
I turn off screws on casing perimeter. We take out a lens cluster. In this cluster there is a diaphragm.
If to look narrowly, the back lens of it pleases even less, than a lobby. There is a mold fungus.
Clearly that defect which was viewed outside is visible.
I will photograph separately defect in order to study lens damage level.
It seems that the lens was melted off. So far it is unclear how it was melted off.
Disassembling of a lens is finished. We will look at lens components.
The most part of the casing and internal details are plastic, including focus gears and their fixing. It is collected not really accurately, there are glue traces drops. Some moving important parts are metal.
The extra budget lens Canon EF-S 18-55mm f/3.5-5.6 IS II is plastic, but it is equipped with glass (not plastic) lenses. The lens was made in Taiwan. In this case it left the mark though it is impossible to tell that everything is absolutely bad (as when it was made in China).
Oleg sent a lens to me long ago so I don’t remember any more how the lens perished. Considering a status of lenses, I will assume that it fell in a pool and after that, it wasn’t dried up (the mold went). Lenses could be washed out if accurately to sort a lens, but I am too lazy to collect it back… We will leave spare parts for the scientific purposes (assembly of different adapters).
That there is a wish to mark a cheap lenses have glass lenses, contrary to a national rumor. But they can have a one-layer enlightenment of internal lenses and absence of scratch-resistant coverings. Also in inexpensive lenses people don’t use expensive optical materials, like fluorite and its cheap analog of UD element.