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Old Nov 9, 2010, 9:01 AM   #1
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Default fz38-magic UV filter!

I bought recently a brand new HOYA UV filter 46mm, to protect the lens of my fz38. After several days I noticed some dust UNDER the filter... I said "ahhh, strange!", and I cleaned the lens+filter both sides, but there is often dust between the filter and the lens again...Any idea what happens and what to do to get ride of this?alexander

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Old Nov 10, 2010, 12:05 AM   #2
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Nobody ever experienced the same? Having dust between lens and filter?
A.
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Old Nov 10, 2010, 12:15 AM   #3
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that is normal, dust does get under filters, no idea where they come form but it does. I have had dust get inside a seal lens in the past.
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Old Nov 10, 2010, 10:39 AM   #4
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How are you satisfied with that filter?
THat Hoya UV filter is my Watchlist on ebay for 6 months , havent decided yet is it worth ~10 $.
Some photo samples?
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Old Nov 10, 2010, 10:52 AM   #5
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I use the Tiffen UV filter (because it's cheaper ), and I also notice some dust inside. These are simply screwed on, so it's not air tight, therefore dust gets in.

Don't see any IQ degradation, except when I use the LC-55 conversion lens. The UV filter seems to decrease available light just slightly, so I take it off.
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Old Nov 10, 2010, 11:14 AM   #6
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Personally, I don't use a UV filter, but some of the Hoya filters are better than most. Here's a test of a lot of UV filters.

http://www.lenstip.com/113.1-article...ters_test.html

Note how much better the Hoya HMC and HMC Pro filters are in harsh lighting compared to most for flare related issues (ghosts from flare, washed out look due to loss of contrast from veiling flare, etc.). But, some of the other Hoyas were not as good. Here's a test of a Hoya HMC (which got top marks in their tests):

http://www.lenstip.com/113.15-articl..._HMC_UV-0.html

I'd probably avoid the cheaper Tiffen filters, especially if you're shooting with any brighter light sources in an image. See how one performed on this page (significant flare related problems, as you can see in the image samples).

http://www.lenstip.com/113.24-articl...n_72mm_UV.html
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Old Nov 10, 2010, 11:28 AM   #7
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But panasonic uses 46mm filters, these are all 72mm ?
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Old Nov 10, 2010, 11:29 AM   #8
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Ah, good to know Jim! Thanks. For now, my filter is staying off because I use the LC55 a lot.
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Old Nov 10, 2010, 11:40 AM   #9
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Quote:
Originally Posted by hrvoje xyz View Post
But panasonic uses 46mm filters, these are all 72mm ?
Yes, all they tested was 72mm. But, optical characteristics of a given filter brand/model should be the same (transmission characteristics, coatings, etc.), regardless of size (although you'll probably see more flare related issues with larger lenses and glass surfaces).

Personally, I don't use 'em (protective filters), as UV light isn't going to matter with modern digital cameras (most of it gets filtered by the lens coatings and filter at the sensor anyway), and anytime you add extra glass, you can cause image degradation. But, some users like them for lens protection.
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