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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 02 Aug 2012 (Thursday) 23:12
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Question about damaged lens coating and filter

 
Michael ­ Tsao
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Joined Apr 2008
     
Aug 02, 2012 23:12 |  #1

If I put a coated filter on a lens that has slightly removed/damaged coating on the glass will IQ and reflection be improved?




  
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whuband
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Aug 02, 2012 23:47 |  #2

Probably not. Lots of money is spent to make lenses as good as they are. Putting cheaper glass in front of them, unless it serves a specific purpose such as a polarizer or a ND, will not improve your images. You could run a few tests but I bet you don't see much difference, if any at all.


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ZoneV
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Aug 07, 2012 04:58 |  #3

Most likely not good to use a filter:

Normal with coated lens and filter the lens reflects ~0.5-1% of light back to the filter.
Good filter itself reflects 0.5-1% of this back to lens.
From 100% of light in to the lens and filter 0.01% comes back to the lens.

With uncoated lens (parts):
Lens reflects 4-5% back to filter.
Same good filter reflects 0.5-1% of this back to lens.
From 100% of light in to the lens and filter 0.05% comes back to the lens.

This is nearly nothing - but if for example the sun is shining directly on the lens, this is enough to get flares in the image.
As long as you not take photographs with correct exposure setting for the sun surface ;-)a

Simplified calculation, reflection of not vertical light incident is much higher!


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Question about damaged lens coating and filter
FORUMS Photography Talk by Genre General Photography Talk 
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