I have Gen III 2x and 1.4x teleconverters. 2x cap is slightly longer before putting on. After being pulled and mounted on a 2x teleconverter, it sticks out a bit. The situation is different with the 1.4x cap, which sits looser and is extremely short. The cutout (to show the red dot) at the end of the lens is barely visible, so the dot is barely visible. The caps offer protection and match the cap pattern on my telephoto lens, but I expected more than I got.
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