I only use high quality clear protective lens, not UV, and the difference is not noticeable under normal lighting situations. But to play safe I would still take it off whenever possible, because another piece of glass may cause unpredictable reflections bouncing inside the lens, which may lead to excessive ghosting, reflections, etc.
Thanks for your video. It depends on the quality of the filter. Some low quality filters affect sharpness and contrast. I do believe the negative effect of high quality filter is minimal. If you do wildlife photography and need to hike a lot, I would put a high quality filter on to protect expensive lens. Low end lens don't need filter though. I saw a person using a Canon L lens in a cave in USA where there were a lot of people. His lens was rubbed against sandstone wall. His lens didn't have any filter on. If you do mostly indoor work, I would not use filter.
@@MUSECHAN yes, it was my first time viewing your video. Since you are a pro, it makes sense. Most amateurs can’t afford replacement of scratched up expensive lens.