TAMRON AF 17-50mm F/2.8 [IF] 67 A16

Using my TAMRON AF 17-50mm F/2.8 [IF] 67 A16 – my favorite producer – has become increasingly painful. This forced me to look for the reason to remove it. This is not a problem for me.
Even after the bayonet was over, I experienced the unpleasant sensation of something cheaply built. The screws are made of some soft alloy, wound in polycarbonate directly, “I continued with caution. When I pulled down the rear optical block and the aperture block I found the problem – the company had given me a bonus one spring for the bayonet contactor stuck in the slit of the zoom mechanism!
I will share an opinion on the mechanics and the quality of workmanship.
First of all I want to say that all companies have been targeting the production of lenses with a small resource of life but at great prices. There is no way Tamron can compete on this background without sacrificing quality! But my word is about this particular lens.
Optically, this lens is very good – sharp, with nice colors and acceptable distortion. In this class it is difficult to find competition, and its price to others is lower.
Built from a combination of carbon and metal. The metal elements are covered with teflon to reduce friction and to avoid lubrication. But because of the weight of the first optical block and the strange constructive solution, when the block is pushed forward, leaving it bound only 3mm. the whole construction is loaded and the desire to shorten the lens has led to a loss of fluidity and a great load on the whole system. This difficult movement in turn puts bayonets on the camera itself. I used a B21 lubricant that was appropriate for the case, and I managed to achieve a very decent moving effort.
In addition, I lubricated the focusing mechanism – Carbon itself is used for bearing, so I used silicone grease for slow-running gears. Now there is simply no tension in the mechanism.
I noticed that some strange lubricant has been placed at the factory which has significantly changed its viscosity and has become sticky.
In conclusion, if you decide to disassemble this lens, keep in mind the following – a relatively complex construction, the screws are wound directly into the carbon fiber – and it is sturdy but relatively brittle, so you do not exercise your physical strength, you can not use liquid oils.

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