Hi, Same with ALL screw threads! People tend to try and screw in the clockwise direction first and this in a lot of cases causes the cross threading so just try turning the filter a little in the wrong direction so that the threads align then screw on as normal, don't try and force it on.
Russ
The graphite trick is a good one. Best trick though, is to go through your filters, and chuck any made of aluminium. The have a nasty habit of jamming onto even the cleanest of threads, and can have to be released forcibly. Brass filters won't stick, and thread on beautifully.
It's not an expensive solution at all. A seized aluminium filter, which has to be forced from an expensive lens, is an expensive problem, which can be mitigated by using a brass filter.
My assertion that brass is far less likely to seize IS true. t is not merely anecdotal. A quick web search finds many articles regarding this subject, and the consensus, from lens and filter manufacturers, from pro's and amateurs seems to support my statement, and is both objective and empirical. Brass is best.
i wish i had them on tight ,my problem is getting it on in the first placeThe trick with over-tightened filters is not to squeeze them when trying to get them apart. This distorts the rim by an imperceptible amount, especially slim-mount ones (including brass) and locks the threads. Rubber bands or those grippy plastic things used for opening jars work well by spreading the load around the rim more evenly. If all else fails, try a filter wrench £3 http://www.amazon.co.uk/Filter-Removal-Wrench-62mm-Filters/dp/B00AIQCHY8/ref=sr_1_8?s=electronics&ie=UTF8&qid=1386532370&sr=1-8&keywords=filter wrench
