fits and does not influence the autofocus of Canon 70-200 / 4L IS

Already have an unsuccessful attempt with a highly acclaimed Matrumi HC, which I purchased in the bay. Looks great, great processed but the autofocus will not come to the point and so almost all the images are blurred. So this part was useless for its intended purpose - and was especially protective of the lens. (The "improvement" of image or color characteristics of a UV filter is anyway a purely strategic sale assertion and nothing can justify or even to prove)
The here rezensierende part comes well packaged therefore and is also inexpensive purchase. The first fingering reveals a loose and easily rotatable disc. Selbige is screwed with a small ring on the thread, just not strong enough. Lack special tools are attemps of improvements in vain, with the screwdriver you should rather not go to work. Otherwise, the first visual inspection was passed and the filter screwed. Very few twists but he is nevertheless. First test photos: The AF comes back clear and focuses on the point, the focus is the way I was selbige usual. Will tonight fotofieren a light bulb and if no aureole gets missed, the glass front of the lens remains ;-)
First conclusion:
suitable for the protection of estimable lens, images under normal lighting conditions suffer no apparent harm