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Warning: Cheap Filters Can Harm Your Glass

Oct 17, 2013 by Udi Tirosh 9 Comments

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There is quite a debate going on about whether one should use filters for lens protection or avoid filters for better quality.

Here is another thing to take into consideration – Some cheap filters may harm your glass, not just your image quality.

Warning: Cheap Filters Can Harm Your Glass

Roger Cicala of Lensrentals had a few Canon 24-70 f/2.8 Mk II returned with a circular scratch pattern on the front element. This can be quite annoying especially since this is a $2,000+ lens.

This got Roger to experiment with various filters. He realized that the cause for scratches is contact between a cheap “thin” filter and the slightly bulged front element of the 24-70.

The good part is that not all lenses and filters produce this undesired effect:

“It seems that you need the proper combination of a thin-line filter with glass close to the back of the filter, and a lens with a slightly bulging front element (this lens has one, but so do lots of others) to even worry about it. I would also think that wider front elements (this is 82mm) might allow more play or sag in the center making this more likely” #

Rojer suggests to “stay away from ultra-thin filters on these lenses, especially discount ultra-thin filters” or at least check that the lens does not come in contact with the filter.

[Bad Times with Bad Filters | Lensrentals.com]

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Filed Under: DIY Tagged With: filter

Udi Tirosh: from diyphotography.net

About Udi Tirosh

Udi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

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Udi Tirosh: from diyphotography.netUdi Tirosh is an entrepreneur, photography inventor, journalist, educator, and writer based in Israel. With over 25 years of experience in the photo-video industry, Udi has built and sold several photography-related brands. Udi has a double degree in mass media communications and computer science.

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