Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: any problems using a lens hood or reversing the lens hood for storage with this filter?
Document: I haven't had any problems with getting the filter on or off of my lens, it was crystal clear when it arrived (no finger prints/smudges), and it looked like the glass wasn't even there, but it was! I think it works great and is worth the money (which really isn't even that much!). **I use this on my 18-55mm kit lens from my Canon T1i**
When i got this, it didnt look like there was even glass it is so clear. This is my first UV filter, and without using it i can tell it will do a fine job. I bought it mainly for protection, without loosing my great quality. If you have the spare cash, buy up, These UV filters can save your lens when you need it the most.
(By the way, I don't see how using a cheap uv filter would act good for a lens protector if you have a lens cap, a cheap uv filter just seems inconvenient.) So to wrap this up I am giving this filter 5/5 because for such a cheap price you're getting premium quality!I would recommend this to anyone that owns a DSLR.
This is a great filter. I compared it with my B+W filter and both are great. I only use it part time, but I haven't had any lens flare yet. I used it on several boat trips in the ocean. I had some seawater mist on it, cleaned it, and it was fine. I don't really notice any reduced haze from using the filter. I mainly use it for protection.
I've been using the Sigma filters for years and they have always been superb.You cannot even see the glass it is so crystal clear.I ordered this filter to replace one that broke when the camera fell. I know these filters are made to protect against UV light, but it likely saved the lens glass as it took the brunt when the camera fell.I highly recommend these Sigma filters!
I am using this one on a kit canon lens 18-55mm, it works great, since my lens is very wide this filter still produce some small flares on very strong lights or sunny days, they are not bad or strong but just singled color dot from time to time, depending of the angle.Other than that, I have not noticed any sharpness lose on the image or color change, actually the colors seems more defined and good contrast balance.Price is right, it is all metal and glass.
I received the filter within a few days after ordering it. The filter was packed in a good plastic protective case, and it screwed right on the lense without any problems.I'll buy this filter again if something happens that requires it.
I put this on my 50mm 1.4. The photos just didn't look right. It changed the bokeh in a weird way. When I took it off, I was confident in my photos again. I just put this on the kit lens instead. I'll just use a hood on my 50mm for protection
I've had this on my camera for about a year now and haven't had any problems. It doesn't seem to affect the photos at all, which is what I like to (not) see.
This thing is so clear that you have to hold it at an angle to see the glass. I did not notice any issues while using it. My lens still worked great and images were crisp, with no fringing, or focal issues. It protects the glass and I don't have to worry about putting on a cover (really why I got it).
Answer: No problems whatsoever. Lens hood will work just the same and be able to reverse for storage.