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Old December 19th, 2004, 08:03 PM   #1
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wd 58 and polorizer

How do you use a polorizer and a wd 58. The 58 doesnt have threads on the outside, just threads for mounting to the lens. Do you have to use a filter holder and how would that mount to the wd 58?
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Old December 19th, 2004, 08:34 PM   #2
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You could get a clamp-on sunshade or just use a 58mm filter at the base of the WD58. Some say this will throw the lens slightly out of focus and other's say this is nonsense. Personally, I don't see any loss of resolution when using the filter at the base, but I've never done any tests. There's a number of posts about this if you do a search.
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Old December 19th, 2004, 10:07 PM   #3
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A polarizer is one of those filters that won't work well when sandwiched between the lens and camera. A polarizer needs to "see" the incoming light first and, of course, it must rotate (which will cause grief with your hood orientation).

The correct, albeit an expensive, solution is to use a rectangular filter mounted in a rail-mounted matte box. You might be able to jerry-rig a setup using a flexible clamp to hold a rectangular polarizer in front of the lens but it will not be a very long-term good solution. There may be a clamp-on mount that will work with the WD58 but I am not aware of one.
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Old December 20th, 2004, 07:41 AM   #4
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I have a clamp on sunshade made by Century Optics that fits nicely on the WD58. It accepts Series 9 drop in filters. I believe they make Series 9 polarizers, but I don't know how you rotate them, or if they would fit in retaining ring.
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Old December 20th, 2004, 09:59 AM   #5
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A polarizer is doing his job, wherever is't mounted in the optical path. There are pro and cons w.r.t. sandwiching between the WA and the frontlens. There is some more risk for vignetting when ''in between" setup, and also the mechanical strenght of the rotating rings have to be verified with the ''heavy'' WA. The pro is, apart from price differences for good coated filters, that anything in front of a WA is seen by the cam (dust particles, smudge), especially with high F setting which often goes together with the use of a polar (sunshine...). I use it sandwiched on a WD58 without problems. B.t.w. I never checked the bi-refringence performance of a WD58, but if it is present (often occurs in acrylic lens parts) the lens sharpness will be lowered when polarized light passes through the WA. So at least a front polar needs to de-polarize (circ polar type)
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Old December 20th, 2004, 10:03 AM   #6
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Marco - is this it? Looks kinda handy?

http://www.centuryoptics.com/products/filters/polarizers/rotating.htm

Grazie
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Old December 20th, 2004, 10:10 AM   #7
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Nope. That's a completely different product, but it looks pretty cool. You may need to contact Century. I've never seen my sunshade advertised on their site. I bought it used and I don't know if it is in production anymore. I can post the model number if you like tonight when I get home from work. One cool thing about it is that it lets you use Series 9 split diopters. I don't know how people do that with rectangular sunshades and matteboxes.
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Old December 20th, 2004, 12:36 PM   #8
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Hello all.

There are several questions here that I thought I might answer.

First of all the Century Series 9 sunshade filter holder has been replaced by one that accepts 82mm screw-in filters (stk# 0DS-FA82-00, list price $195) . This shade clamps on to an accessory with a 80mm outside diameter. While intended for Century accessories, I believe the Canon 58mm .7X wide converter is that size as well.

One would purchase an 82mm polarizer and thread into the shade.

Sandwiching a 58mm pola: There is no optical reason to prevent you from doing this-- the caution is that it will act like a spacer, moving the wide angle converter away from the lens, this could cause vignetting-- check coverage on a monitor in the underscan mode to be sure you are not getting dark corners.

Circular vs linear polarizers. The metering systems (auto-focus etc) of some camera's can be adversly affected by polarized light.

It is also possible to cause some color shading problems in prism type video cameras under some conditions.

For these reasons, circular type polarizers (which depolarize the transmitted light after first polarizing the incident light) are techinically the correct type to use. Many, Many users are perfectly happy with the less expensive linear type and notice no ill effects --- but I am not endorsing their use or promising you would never have a problem.
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Old December 20th, 2004, 01:01 PM   #9
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Ah, that explains it. Bill, can you tell me if Century is backing off its support for Series 9? I've been wondering if it makes sense to continue to invest in Series 9 filters. I find it a very convenient size.
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Old December 20th, 2004, 04:52 PM   #10
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Series 9 filters are still readily available from professional film and video dealers, much less common at photo/video stores.

We concluded that it was simpler and better for the typical user to use purchase 82mm screw-in filters-- and as you mention the series 9 polarizer presents problems in terms of rotation-- using an 82mm polarizer is straight forward.
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Old December 20th, 2004, 05:00 PM   #11
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Terry, I have one of those century series 9 adapter, (+series 9 rotating ring + magnifier +2 also), for the canon lens and a circ polarizer never used if you want it I'll let it go for a good price.
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Old December 21st, 2004, 09:58 AM   #12
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Thanks Gents for the help. I learned a lot and really appreciate that. Richard, thank you for the offer, I will look at yours and Bills and make a decision. Again I thank you all for the info. I am looking forward to shooting some, well alot of ski/snowboard footage this winter.
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Old January 2nd, 2005, 04:26 PM   #13
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<<<-- Originally posted by Graham Bernard : Marco - is this it? Looks kinda handy?

http://www.centuryoptics.com/products/filters/polarizers/rotating.htm

Grazie -->>>

Good luck finding one. They don't seem to exist anymore and Century seems to have no plans to produce any more. Bill?
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Old January 3rd, 2005, 01:21 AM   #14
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Hiyah! I finally . . Robin can rest in peace now . . put my money down on this puppie: KESTREL BELLOWS MATTE BOX. this firm does an adaptor for the WD and I've used it. If you wanna sample of some snow covered parts rural Manchester I can email them to you.

Here's the manufacturer: http://www.truelens.co.uk/matte/kestrel.htm


Grazie
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Old January 3rd, 2005, 11:30 PM   #15
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<<<-- Originally posted by Richard Maloney : Terry, I have one of those century series 9 adapter, (+series 9 rotating ring + magnifier +2 also), for the canon lens and a circ polarizer never used if you want it I'll let it go for a good price. -->>>

Richard,

If you still have the century adapter and circ polarizer I might be interested in buying. Please email me the details and price at pete.wilie AT earthlink.net

Thanks.
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