To be fair, the falling off may be the lens - I can't tell. Basically it seems like there just aren't enough threads engaging. I am using it on a refurbished (by Nikon) Nikon AF-S 55-300 1:4.5-5.6. I have NOT tried any other filter on the lens.I have the same filter in 52mm and have used it on 2 other lenses (18-55 and 55-200) and it seems to engage more than this bigger filter in the longer lens.As long as you get it seated and remember to twist the filter orientation in the direction of tightening the filter it's okay. I got it backwards and ended up unscrewing the filter (which only seems to be less than a full revolution - less that one full thread) and it fell into dry sand. It doesn't look like it got damaged but I just don't enjoy using it because of the high possibility it may fall off again.And, it's hard to get the threads started.Again, I haven't used any other filter on this lens so it could be the lens too, which is more of a question because the lens was refurbished (although the threads don't look bad or as though they'd been truncated somehow).As for the pictures, I used it to effectively remove glare from a water body. It seems to work fine (as does my 52mm which I've used a lot more). No complaints but I may not see differences between this and a B+W anyway. I can certainly see the difference between this and no filter. I'd buy one again. I think the Tiffen's are a great cross between results and price. When I start seeing artifacts maybe I'll spring for a B+W or other brand.

Mount seems a little tight. The 18-55 fits much better. Not sure if the lens is re-furb, used, or new. Unsure what "white box" means. Came with no Canon literature or packaging. Lens works well and takes a clear bright pic.I guess the low price is why it came the way it did. All that's left is to go on a picture taking trip and test it against my Olympus E-PL1.

Another quality Tiffen filter, works well on my Nikon 18-140 lens.

For an entry-level camera this has given me far more than entry-level results. This is the only DSLR I could afford, and for the money I payed for it I was very pleased. Even with the 18-55 (which has crapped the bed) I was able to get great results even though I had to manual focus the whole time because the lens sucked! Check out my pictures at ([...]) All the pictures on there were taken with the XSi with the 18-55 kit, with the exception of like three pictures that were taken with a crappy fujifilm point and shoot. The camera itself is great. It may not have great build quality, but as long as your not thrashing it around it will hold up... The most important thing about this lens you need to know is KEEP IT CLEAN..don't take off the lens and leave the mirrors exposed..that was my biggest mistake!

Works perfectly with my 18-55 lens, now I have 2 extra covers.

Love this ...I truly love it. I take pictures just for fun and this is a wonderful lens ... my 18-55 lens quit working so I thought I would try something new and I'm glad I did this is great..

I am using this bag for my Nikon D5000 with only one 18-55mm lens. It should fit another lens, but I am not sure.

This filter works great. I have used this filter on a Nikon 18-70mm lens and have produced excellent pictures. I have yet to experience any flare with this polarizer. Great polarizer for a great price.