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Square filters for UW lenses

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Silverfox View Drop Down
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Post Options Post Options   Quote Silverfox Quote  Post ReplyReply Direct Link To This Post Topic: Square filters for UW lenses
    Posted: 03 November 2012 at 09:17
I am planning to get a set of graduated ND square filters for landscape photography. Currently I use mostly the Tokina 11-16 or Sony 16-50 for most of my landscape shots. As I'm new to using these filters, I have concerns about vignetting especially at the wide end. Does anyone have experience with square filters on these lenses? Any particular brand/model to recommend? Do I need >100mm size filters to avoid vignetting?
 



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Xavier View Drop Down
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Post Options Post Options   Quote Xavier Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2012 at 13:20
Cokin and Lee websites will be able to help you with the appropriate sizes you would need.
The vignetting is partly to do with the holder and how far it comes out.
However if you're a bit strapped for cash and you want a cheap fix in the meantime you can always cheat and use blu-tak to mount the filter directly over the lens. If it's wide enough to cover the front of the lens then you won't get vignetting :)
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Post Options Post Options   Quote Silverfox Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2012 at 15:19
I was eyeing the Cokin Z series, but a number of customer reviews on websites like B&H seem to indicate vignetting issues on UW lenses. For Lee, the equivalent is the 100mm foundation kit. But there is little info on whether there will be similar issues for UW.
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Post Options Post Options   Quote Llew81 Quote  Post ReplyReply Direct Link To This Post Posted: 03 November 2012 at 16:35
I use Lee filters and almost exclusively a polariser or an ND8.

Using the WA adapter ring I see little to no vignetting with the a900 and Zeiss 16-35mm..

Also they have a system where you can rotate two sets of filters separately so real good if you were every wanting to use a polariser and another filter like a graduated ND...

The kit is expensive but I would say that it is worth it... they also do over size lens caps so you don't need to keep removing the adapter rings every time you finish shooting.
Sony a7r: CV 15mm f4.5 Heliar, Leica 28mm f2.8 APO Elmarit, Zeiss 55mm f1.8, 50mm f2 Summicron-M, CV 75mm f1.8 classic
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Post Options Post Options   Quote silversurfer Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2012 at 14:03
I began using Cokin P series holder and filters (non-ND) only a couple weeks ago. I notice vignetting on the wider side (11-15mm) of my Minolta 11-18. However, this is with a screw on Hoya ND filter attached. FWIW, Cokin also makes the P Series BPW400 filter for use with wide angle lenses, but it holds only 1 filter.
Sony A77|Minolta 35-70/4|Minolta 70-210/4http://www.flickr.com/photos/pheanixphotos/
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Bob Maddison View Drop Down
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Post Options Post Options   Quote Bob Maddison Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2012 at 14:46
Whatever square filters are used, they still have to be attached to the lens via its round filter thread. This is probably the weakest link and, dependent on lens design, can cause some vignetting. After that, you need to remember that the square filter is held some distance from the lens hence it needs to be just a little larger than a comparable round filter attached directly to the lens. For occasional use, you might consider a 100mm square filter just held in place manually during exposure.
 



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rickztahone View Drop Down
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Post Options Post Options   Quote rickztahone Quote  Post ReplyReply Direct Link To This Post Posted: 05 November 2012 at 19:19
OP, check this thread out here that shows my experience with a ND holder plus HiTech ND filters. I get some slight vignetting w/ all 3 stacked at the wide end of my 16-50.
a99+VG|a77+VG|a55|Nex6|HVL-56/58|minO|58 1.2|24|Tam|90|SAL||16-50|70-200|∑|50 1.4
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Silverfox View Drop Down
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Post Options Post Options   Quote Silverfox Quote  Post ReplyReply Direct Link To This Post Posted: 12 November 2012 at 15:46
Went to a shop the other day that had both Lee and Cokin P-series. They said the P-series would definitely cause vignetting. Unfortunately there is no dealer in my area that brings in the Cokin Z-series.

Also saw the cheap Tianya holder at another shop. Did not try that as it looked similar to Cokin design and same size as the P-series except that it is one piece molded.

I finally settled for the Lee foundation kit with wide adapter for my Tokina 11-16. There was some vignetting at 11mm with my round UV filter mounted. After removing the UV filter, there seemed to be no noticeable vignetting. Guess I'll have to use it w/o the UV.
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Post Options Post Options   Quote Bob Maddison Quote  Post ReplyReply Direct Link To This Post Posted: 12 November 2012 at 15:53
I would expect vignetting with both a round and a square filter mounted on almost any lens. The filter should always be as close to the lens front element as practicable.
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