After seeing Neuro's test I remembered that I had aCanon UV filter that I could compare to my B+W MRC filter. I originally bought the canon filter with my EFS-15-85 because canon wouldn't put their name on anything but the best, right [:P]. Anyways, I am very glad to have TDP site and these forums because I upgraded to the B+W MRC very quickly.


So last night emulated Neuro's test adnI tried the different filters (an no filter) aimed at a recessed light in my kitchen and at a flash light in the kitchen with all the lights on (more on that at the end). Here are the results:


With the canon UV filter


[img]/resized-image.ashx/__size/800x0/__key/CommunityServer-Components-UserFiles/00-00-00-46-64-test/Direct-Light_2D00_Canon-Glass-Filter.JPG[/img]


With the B+W MRC filter


[img]/resized-image.ashx/__size/800x0/__key/CommunityServer-Components-UserFiles/00-00-00-46-64-test/Direct-light_2D00_B_2B00_W-MRC.JPG[/img]


With no filter


[img]/resized-image.ashx/__size/800x0/__key/CommunityServer-Components-UserFiles/00-00-00-46-64-test/Direct-light_2D00_no-UV-filter.JPG[/img]


I also tried looking at the light at more of an angle:


With Canon UV Filter


[img]/resized-image.ashx/__size/800x0/__key/CommunityServer-Components-UserFiles/00-00-00-46-64-test/Angled-Light_2D00_Canon-Glass-Filter.JPG[/img]


With B+W MRC filter


[img]/resized-image.ashx/__size/800x0/__key/CommunityServer-Components-UserFiles/00-00-00-46-64-test/Angled-Light_2D00_B_2B00_W-MRC.JPG[/img]


With no filter


[img]/resized-image.ashx/__size/800x0/__key/CommunityServer-Components-UserFiles/00-00-00-46-64-test/Angled-Light_2D00_no-UV-Filter.JPG[/img]


I didn't upload the pictures, but relevant to what Daniel just posted, I also tried shooting at a maglight but with all the ambient lights in my kitchen on and usingthe flash mounted on the 7D. Under those conditions, I didn't see a difference betweenthe filters, which would support Daniel'spost. BTW, their seem to be benefits to being Captain Obvious...I had to run a test....[]