Help With Cokin Filters

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matt_wright

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Matt Wright
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Hi Guys
I am looking to get some Cokin Filters for me lens collection.
Mainly i want to use the filters with my 10-22mm lens, and i have herd that it is not advisable to use a normal screw in circ pol, as it will be an un-even effect across the sky.

So i am looking into cokin p-series filters. Now i know i have to buy the filter holder and the correct adapter size for each lens thread.

And i see you can buy a wide angle holder http://www.warehouseexpress.com/product/default.aspx?sku=1000765.

I guess my question is has anyone got one of these on a 10-22 and how does it perform? i.e. does it cause extra vignetting? and if it causes extra lens flare as you cant fit the lens hood on too (I assume you can't anyway)

Or am i looking at the tottaly wrong thing, and can you guys suggest a better idea!

Cheers
Matt
 
The wide angle adapter will help, but I believe the cokin filter holder is a solid 4 slot so even with a wide it causes a slight amount.

In his book Lee Frost suggest getting 2 holders and using a hacksaw on one of them (reducing it to 3 or 2 slots) to help avoid vignetting on really wide lenses
 
daftbugga said:
yes i'ts true that you get an uneven effect , but that will happen with ANY cpl on a ultra wide lens simply because of the ammount of sky you can see and the position of the sun .

as for using the whydangle holder ,i have one & use it with my sigma 10-20 and get vignetting @ anything wider than approx 14 mm . said lens has a filter thread of 77mm i dont know how that compares to a canon 10-22, but you may well find cokin P size causing a problem .
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The 10-22 has a 77mm thread to, so will likely cause the same issues!
Do you know the difference between the WA holder and the normal one?
 
Not sure if this is any help, but there is a chart HERE as i was wondering the same myself as i have a 12-24mm lens if anyone could throw a bit more light on the subject it would be helpful :)
 
I'd expect any filter size to cause vignetting when the lens is at or near 10mm.
 
Because it has about a 100 degree view horizontally. Anything sticking forward from the lens even a small amount would affect the image
 
Uneducated_Rick said:
Because it has about a 100 degree view horizontally. Anything sticking forward from the lens even a small amount would affect the image
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Ok so is there anyway around this ?
 
kennysarmy said:
dont have something sticking out from the lens?

:) lol
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Quite :lol: i did think Cokin did some ultra wide holder to counteract this, but i must have read it wrong :shrug:
 
matt_wright said:
Mainly i want to use the filters with my 10-22mm lens, and i have herd that it is not advisable to use a normal screw in circ pol, as it will be an un-even effect across the sky.
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I have ultarwide CPL filter from Kenko which I am using on Sigma 10-20mm quite allright. The thing is that sky darkening is only one of the polariser's many applications - it is still usable on wide lenses. And on a zooms like this Sigma 10-20 it is usable at a longer focal length even on a sky.

matt_wright said:
I guess my question is has anyone got one of these on a 10-22 and how does it perform? i.e. does it cause extra vignetting? and if it causes extra lens flare as you cant fit the lens hood on too (I assume you can't anyway)
Click to expand...

All the suggestions made above have stated this already - Cokin holders are too big for the widest end of this lens and will cause some vignetting. You may try to get a Cokin wideangle holder with only 2 slots but it still does produce vignetting at 10mm. TBH, at this focal length you have limited options. EIther you would need to go for larger size filters Cokin Z-Pro or X systems, Lee filters or similar. But this will of course cost more both for adapters/holders and for filters.

Lee Frost suggests a simpler and budget savy approach - get yourself a Bluetack gum and attach filters (Cokin P or other inexpensive ones) directly to the lens outer rim. This is the only way I know of that workds with widest lenses. It does have a limitation though - you can only do it if the front element is not sticking out further than the outer rim of the lens - otherwise you would not be able to attach filter at all (may be to the lens hood if there is any).

If you seriously thinking of getting into the filter use (especially rectangular systems) - get yourself a Lee Frost's book. I found it very useful.

For the flare: I found Sigma 10-20mm to be very flare prone especially when optical path is modified with filters of any kind. Even with simple but supposedly high quality UV filter it gave me a nasty green flare shooting at nighttime from the streetlights. So I'd avoid shooting into light sources if using filters with this lens at all.


arclight said:
I'd expect any filter size to cause vignetting when the lens is at or near 10mm.
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That is not true at all. If it was then Sigma own lens hood supplied with 10-20 lens will cause vignetting and it does not.
 
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