12-25-2010, 01:53 PM
Get a good multicoated one, like for instance a B&W. Your probably do not need a slim one, a normal profile B&W should do fine too on the Sigma 10-20mm. But of course, that is quickly found out in shop.
Contrary what is being said above, you can of course well get a very dark sky with an UWA lens. Only thing is that the sky will not be as even of shade as with a lesser viewing angle, that is the nature of polarized light distribution.
So anyway, yes, if both have the same thread size, both can use the same pol. filter.
Contrary what is being said above, you can of course well get a very dark sky with an UWA lens. Only thing is that the sky will not be as even of shade as with a lesser viewing angle, that is the nature of polarized light distribution.
So anyway, yes, if both have the same thread size, both can use the same pol. filter.