Wide angle lens with polarising filter

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plloydie

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As a complete newbie i need some advice on the following i have a Sigma 10-20 mm lens and i was thinking of getting a polarising filter for it before i go to the Everglades & Keys but i have read conflicting advice about "yes get one or no do not get one due to vignetting ' the type i was looking at is a 77mm screw-in type.

There could be a lot of bright sky (hopefully) water and white sand hence the reason for CPL, any thoughts?
 
They do make slim ones, I have only had an issue when I accidentally stacked a CPL on top of a UV on a wide angle though.
 
My understanding (and the reason I don't have one for my 10-20) is that polarisers don't work on UWA as the angle of view means only part of the image is polarised.

Could be wrong though.
 
Nawty said:
My understanding (and the reason I don't have one for my 10-20) is that polarisers don't work on UWA as the angle of view means only part of the image is polarised..Could be wrong though.
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...this is a 72mm Marumi DHG CP-L on a 17-70mm Sigma at 21mm

the PL effect is "almost" falling away in the RH upper corner

I'm sure you're right - it would be worse at 11mm....:shake:

NO comments on the "snap" please - rubbish..:lol:

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Nawty said:
My understanding (and the reason I don't have one for my 10-20) is that polarisers don't work on UWA as the angle of view means only part of the image is polarised.

Could be wrong though.
Click to expand...

Polarising filters darken blue skies, and the effect is stronger at certain angles of view. If you have a very wide lens, the amount of sky included in the image is so broad that it sometimes reveals a darker patch or band across the sky.

It is usually most visible when the sun is quite low, but even then it often looks fine, or may be hidden by clouds etc. Alternatively, moderate the effect by rotating the filter, or just take it off.

I think it's unlikely that you will get any vignetting with that lens - Sigma have thought about this possibility when they fitted the filter thread ;) But just to make sure, get a slim-mount filter. The best ones are always slim-mount anyway, ie multicoated.

Don't forget the effect polarisers have on reflections. There are always reflections on grass and leaves, foliage etc, and a polariser will always make them darker and richer. That's the other reason landscapers like them :)
 

Peg by The Big Yin, on Flickr


On this one, taken with A Sigma 10-20 at 10mm, you can see how the polarising effect falls off towards the left hand side.
 
Definitely worth having a polariser with an UWA although you do need to be careful as already mentioned. Personally I often take the shot with & without the polariser just to be on the safe side

Simon
 
hot-ice said:
As a complete newbie i need some advice on the following i have a Sigma 10-20 mm lens and i was thinking of getting a polarising filter for it before i go to the Everglades & Keys but i have read conflicting advice about "yes get one or no do not get one due to vignetting ' the type i was looking at is a 77mm screw-in type.

There could be a lot of bright sky (hopefully) water and white sand hence the reason for CPL, any thoughts?
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Get a thin rimmed one. Otherwise you'll see a circle around the edge at the widest zoom. I spent good money on one, then promptly forgot to take it on holiday! Bought a 'standard' 77mm in the duty free, the only one there, but found it wasn't that good on the 10-22. Worked on my other lens with a 77mm dia.

Not only for blue skies, also for damping reflections on water, car windows ...
 
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but that's already a vivid blue sky - at least compared to anything I've seen for the last 6 months :lol:
 
Craft said:
GND filters ?

2842193686_b06cdeafc7.jpg
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Does that mean graded neutral density?

Is that the sort of thing I would need to get a cokin style filter-holder for?

Sorry for the thread hijack by the way. I'm hoping my questions may also be relevant to the original poster :)
 
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dougietee said:
Does that mean graded neutral density?

Is that the sort of thing I would need to get a cokin style filter-holder for?
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Yes, probably a Z-Pro if its a 77mm lens, or the Lee Foundation kit+wide angle adaptor.

You will also need a lens to filter adaptor ring too depending upon the lens diameter.
 
I use p-type size on a 77mm lens (24-105L), crop camera mind. Dunno how wide you could go, probably worth a search. I do know that you can get "wide angle" holders that only hold one filter, also seen people here chopping the holders around a bit to stop vignetting.

Never had any, but common consensus is that Cokin filters have a purpley colour cast.
Lee & Singh Ray are the best but at ~£100 each they should be!

Hitech filters are popular both here and in the US, teamworkphoto.com for those. If you stack lots together you do get a bit of colour casting but its not nearly as bad as I've seen from Cokins and you can pp it out.

Adapter rings and holders from premier-ink.co.uk - they do cheapy plastic ones which do the job fine for me, always seen to be pretty quick with service too.

Look at the portland set on my flickr, done with a mixture of hitech GNDs & NDs.
 
AndyB1976 said:
Yes, probably a Z-Pro if its a 77mm lens, or the Lee Foundation kit+wide angle adaptor.

You will also need a lens to filter adaptor ring too depending upon the lens diameter.
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I use a Heliopan thin rimmed circular polariser on my Sigma 10-20, there is a little fall off of the polarisation but no vignetting. With NDs I use Cokin Z Pro with a Cokin holder initially I noticed vignetting but found that it was the filter holder that was causing it, in fact it was the 3rd leafs of the holder by removing those and only leaving two sets of holders there was no vignetting. I now use a Lee wide angle adapter which fits the Cokin holder with 1/2mm of play (no problem) and can use all the glass holders ie 3 of the Cokin holder with no problems. If starting from scratch perhaps get the Lee holder but the Cokin Z Pro filters as I have said befor I have not found any problems with the Cokin Z pros re colour cast but thats another thread:D. For a 10 stop ND I use a Heliopan thin rimmed screw in filter again with no problems and have even stacked the circular polariser on it.
 
petehb said:
I use a Heliopan thin rimmed circular polariser on my Sigma 10-20, there is a little fall off of the polarisation but no vignetting. With NDs I use Cokin Z Pro with a Cokin holder initially I noticed vignetting but found that it was the filter holder that was causing it, in fact it was the 3rd leafs of the holder by removing those and only leaving two sets of holders there was no vignetting. I now use a Lee wide angle adapter which fits the Cokin holder with 1/2mm of play (no problem) and can use all the glass holders ie 3 of the Cokin holder with no problems. If starting from scratch perhaps get the Lee holder but the Cokin Z Pro filters as I have said befor I have not found any problems with the Cokin Z pros re colour cast but thats another thread:D. For a 10 stop ND I use a Heliopan thin rimmed screw in filter again with no problems and have even stacked the circular polariser on it.
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Its interesting to hear the Lee wide angle adaptor fits the Cokin. Ive still not bought a holder or grads. I was leaning towards the Lee Foundation and Wide Angle, or the Z-Pro. I will most likely be buying Hitech filters.

Thanks for that little nugget of info:thumbs:

cheers


Andy
 
And what about HDR, does this exacerbate the polarised inconsistencies?
 
It was made at the end of a really long day :cuckoo:

I think what I was trying to say was, does the potential sky colour banding resulting from the use of a polarising filter with a wide-angle get worse in HDR processing.

I should just go and try it..
 
I liked it better first time :D

But no, the HDR treatment won't change the polarising effect. Make it darker maybe, but not change it.

I can't see that you would normally want to combine the two techniques, but you could easily shoot frames with and without the polariser, and then combine whichever images looked best.
 
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