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That's good advices! thanks, ReyeR well, I try upload a pic again!

I have a stainless steel one and it get rusting quite easily, it takes servicing after every dive time to long last the knife. And I have two titan whch are quite free-of-care and I just rinse them each time after dive and they still look good.

thanks very much to ReyeR's info, it is truly useful and that's exactly what it is to my pt-015, and that pt-015 is similar in design to pt-010, I feel that even if I change a new one, this problem - getting loose underwater when un-installing the additional lens - will still happen. Well...

I bought the C-5050 and pt-015 weeks ago and they are very good for taking underwater pictures. It happened that when I was un-installing the additinal close-up lens and found that the housing front red ring adaptor was getting loose and rotated. After back to the dry land, I un-installed this...