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02-27-2010, 08:24 AM   #1
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Join Date: Jan 2008
Location: Niagara Region, Ontario Canada
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Focus Screen Stuck in Lens

Strange story. I've had jinfinance's split prism focus screen for about a year and a half.

My wife just got back from New Orleans on a business trip and took an ungripped K10d with just the Sigma 17-70mm lens (she wanted to travel light).

On the way back she noticed the focus screen had fallen out. And as anyone who has the 17-70mm knows the rear element is recessed into the lens when it zooms.

The screen got wedged in that space between the final element ring and the mount. We managed to get it out, but the focus screen is shot, so we are back to the OEM screen.

On the bright side, the lens appears fine and tests ok. Looks like the rear element didn't get misaligned. Bless my wife for recognizing the problem and not forcing it (I'm not sure I would have).

Not sure how it happed, I assume it got jarred enough to unclip the lock, or I didn't lock it properly last time I cleaned the screen. But a word of warning to everyone to be careful when your setting up the screen.

02-27-2010, 08:52 AM   #2
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Join Date: Jul 2008
Location: Halifax, Nova Scotia
Posts: 2,925
good to know that it can jam... on most lenses this wouldn't be a problem. I'll be extra careful whenever I change my screens now.
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