While I have not found any flaws in these filters, they feel a little cheap. I have another name brand set for a smaller manual focus lens, so when I got my autofocus lens for a camera I will be shooting video with (both Pentax), I surfed around to see what all filters are available and picked these dudes up just to play with the colored film might delaminate from the glass or make tiny bubbles, and they seem like they would scratch really easily, but again if you just want to see if you like using these, for an intro price they are a pretty good deal.If I find myself using them a lot, I will probably replace them with a brand name, but to explore the different color options these will be fun for taking to the zoo or out to a park or the lake to just fart around with. I could pass them along to a friend or give them to a high school or college if I replace them with good glass and not feel embarrassed about it.One thing I do not like at all is the pouch they come in. You pretty much have to get your fingerprints all over the filter to extract it from the pocket. I usually travel with my filters in a stack and endcaps on them, so this doesn't really affect me, but at some point I'll put them back in their pouch to store between projects and that's going to bug me all over again.ya get what you pay for, so if you know you are going to be using these for a lot of projects, just spend the money and get the more solidly made ones from Polaroid or another name brand, but if you just want to have fun and try them out, you can enjoy these as long as you take care of them.
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