Originally Posted by
monkeymon
It's pretty simple job. Just open the thing up, it's 2 screws in the back. After that there is metal plate held in place with two springs. Then just remove the lens, it's held in place via threaded cap that is also a filter holder. Inside it, is the original blue filter and an a glass UV/IR or just an UV filter.
In the front of the lens, there is this rim you can unscrew. You needs to get a suitable sized step up ring, and remove the male threads from it. So that you just have an step up ring with a hole in it. Then you can place that in front of the lens & screw the rim in to hold it in place. Then you need a step down ring to get some height to it (so it clears the locking ring/rim. i used a 55-49mm), so you can put a filter on it. I did it so that it takes 49mm filters, as it's a size commonly available.
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