Canon 82mm UV Protector Filter

I was worried a clear filter would mess with image quality, but it doesn't affect color or contrast at all—just pure protection for my lens.

Managed to fit onto my wide-angle lens without causing any vignetting, which was my main worry. The fact that it doesn't shift colors is a relief for landscape shots. Keeps the glass safe and I barely notice it's there.

It's almost invisible once screwed on, which is exactly what I wanted. I had no issues stacking it with another filter for a long exposure, and the glass threads engaged smoothly without any binding.