Glass went with me on an expedition to Kamchatka, passed both dust and water, there were no problems. I thought about taking it for a couple of months, then changing it to f2.8, but thanks to the surprisingly excellent sharpness and compactness (which is very important for me), the glass will now remain in the main expedition fleet for a long time. Some pros: Dust and moisture protection (passed the test of heavy rain and sandstorm), internal focusing, image quality, focusing speed, compactness, weight. Different cons: In my copy, there was a small plastic dust under the front lens, it was cleaned under warranty in one day, they recognized that this was a factory jamb. In my opinion, a big minus is the lack of a tripod foot in the kit, buying it for 8000 is a little strangling toad (1/6 of the price of the lens!).
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