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03-14-2012, 08:31 AM   #1
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Filter question

Hello Everyone,

I always use a standard multi-coated UV filter (good brand) as a lens protector. If I want to use another filter, do I have to remove the UV filter? Or I just can add the second filter on the top of my UV? My point is, does one extra glass affect the picture quality?

Thanks,
unp

03-14-2012, 08:40 AM   #2
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Easy answer - yes, multiple filters will have an additive and sometimes even a multiplicative negative effect on image quality.
03-14-2012, 08:44 AM   #3
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Even the good stuff can degrade image quality:

LensRentals.com - Good Times with Bad Filters

However, would you even notice? Test it with your filters and find out. The biggest issue may be possible vignetting.
03-14-2012, 08:48 AM   #4
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If I want to use another filter, do I have to remove the UV filter? Or I just can add the second filter on the top of my UV?
Depends on the lens, some lenses will vignette wit stack filters.


My point is, does one extra glass affect the picture quality?
Yes it will, even the single filter will degrade the picture quality, if you notice it is another question.

03-14-2012, 08:52 AM   #5
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No probs, but dont add too many or it could cause a problem with vigneting.
In fact its poss with certain lens and lens hoods even two might cause vignetting.
The Pro type filters have very narrow edges which helps a lot here.
03-14-2012, 10:58 AM   #6
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Here's another resource for you on this - and vignetting is definitely not the only possible problem from stacking filters.
LensRentals.com - The Glass in Front of Your Glass: All About Filters
03-14-2012, 11:18 AM   #7
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Something to think about, in todays world more and more pro and serious amateurs advise ditching the UV filter altogether. Using a hood instead to both protect and improve IQ.
03-14-2012, 12:08 PM   #8
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QuoteOriginally posted by westmill Quote
The Pro type filters have very narrow edges which helps a lot here.
Pro type?

03-15-2012, 06:16 AM   #9
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Primary function of the UV filter is for protection, if you have another filter to use, then that will become the protection and the UV filter essentially does nothing, so yes take it off and replace with the other filter, its bothersome but you dont risk potential image quality loss.
03-15-2012, 03:52 PM   #10
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I agree with the others but I would like to add some own experience with uv filters (no matter how expensive), do not use it with artificial lighting!
You can get flairs and ghosts
03-15-2012, 04:13 PM   #11
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QuoteOriginally posted by TimHar Quote
You can get flairs and ghosts
Indeed. I always post this image (from the lenstip.com review of UV filters) when there is a thread about UV filters to illustrate some of the image quality problems poor choices about UV filters can cause. You can imagine how bad the image quality would be if you stacked another bad filter on top of what may already be a crap UV filter.

03-18-2012, 03:55 PM   #12
unp
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Original Poster
I really appreciate all the responses!

I am convinced to avoid a filter if all possible and use a hood all the time.

Thanks,
unp
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