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11-30-2007, 05:23 PM   #1
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Thin filters really necessary?

I need to buy a circular polarizing filter for my 16-50 DA* lens. Do I need to get the thin version of the filter, or did Pentax take this into consideration when they gave it a 77MM size? I may also add the 12-14 lens to my bag sometime, also taking the 77mm filter. Same question for the 12-24, will I get vignetting if I use the standard thickness filter?

11-30-2007, 06:03 PM   #2
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QuoteOriginally posted by Pentastic! Quote
I need to buy a circular polarizing filter for my 16-50 DA* lens. Do I need to get the thin version of the filter, or did Pentax take this into consideration when they gave it a 77MM size? I may also add the 12-14 lens to my bag sometime, also taking the 77mm filter. Same question for the 12-24, will I get vignetting if I use the standard thickness filter?
I never had any problems with normal filters on my DA 16-45mm f4, so I wouldn't expect a problem with the DA* 16-50 f2.8. However, my DA 12-24mm f4 would vignette with a standard thickness filter from about 12mm to 14mm. From 14mm up it was fine, and it was also fine with a slim filter at 12mm. So if you want to use the filter on the DA 12-24mm at the wide end, get a slim filter.
11-30-2007, 11:28 PM   #3
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QuoteOriginally posted by GaryML Quote
I never had any problems with normal filters on my DA 16-45mm f4, so I wouldn't expect a problem with the DA* 16-50 f2.8. However, my DA 12-24mm f4 would vignette with a standard thickness filter from about 12mm to 14mm. From 14mm up it was fine, and it was also fine with a slim filter at 12mm. So if you want to use the filter on the DA 12-24mm at the wide end, get a slim filter.
The standard thickness filters will vignette at the wider settings on the 12-24, as mentioned. I purchased, after thinking for a long while, a "Moose" Hoya circular polarizer (with 81A glass) to cut the high altitude blue down, as I do much shooting at up to 7,500 ft altitude. (I live at 3,800+ and hike.)

I reasoned that the sky is so uneven with a polarizer when the wide angle gets much past 28mm equivalent that I won't miss it at 12mm. Check with me after this summer ... I might be post processing a lot of vignetted images The ones with dark blue on the right and light blue on the left ...
12-01-2007, 09:28 AM   #4
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Looks like I better make the additional investment in the slim filter.

Thanks for your help.

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