Observations about the universe, life, Lausanne and me

Thursday, May 12, 2011

Filter removal

Shortly after Christmas I fell, while heroically chasing a suspected fox through the icy steppes of Kaltenleutgeben, Austria. Even though I tried to throw myself under my DSLR, the UV-filter I had put on my EFS 18-200 mm full-range-zoom broke:

But it did its job, i.e. protecting the lens. I subsequently removed the broken glass, but was unable to unscrew the filter ring afterwards. Applying pincers deformed the ring a little bit, so I stopped, leery of damaging my lens. The ring did not stop the lens from working, after all, except that I could not affix another filter.

Filter ring with pincer marks

Last week  I finally went to the local photography store, where a very helpful girl told me that they'd only send the lens to Canon, anyway. Since I have recently purchased a circular polarizing filter, I was determined to get the ring off soon, and on my own.

I needed to apply force to the ring without deforming it, so I took it to the drill press and drilled two 2 mm holes in it. Tense moments there, as a slip could mean scratching the lens.

Holes drilled, it was a simple thing to insert a screwdriver through them, twist, and voilà:

Filter ring with screwdriver inserted through hole.

Removed filter ring!

 Now I am off to take some polarising photos ;)

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