Canon EF 17-40mm f/4L USM

Quick shot, wide open. Looks like it lost a bit of its sharpness through upload though.

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1st few shots ive managed to take with this lens since getting it. Really need to clean my sensor !!!

ISO 50, 17mm, f/14, 3.2 sec

Falls Of Falloch, Near Loch Lomond, Scotland
(Was an overcast day with totally white sky, Thats the best I could get it in PP)

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very nice bjolly

thegfxman wrote in post #11962638
very nice bjolly

Thanks!

Dramatic & Nice, Jacobsen!

Some sick ass landscapes in here. Good job people.

Im thinking of buying the B+W 77mm Kaesemann MRC SLIM Circular Polarizer Filter for this lens.

Can anyone confirm that it works well at 17mm or even show a sample pic? Ive read some places at 17mm cpols can give an odd polirisation with a dark band in the sky.

xpfloyd wrote in post #11967370
Im thinking of buying the B+W 77mm Kaesemann MRC SLIM Circular Polarizer Filter for this lens.

Can anyone confirm that it works well at 17mm or even show a sample pic? Ive read some places at 17mm cpols can give an odd polirisation with a dark band in the sky.

It's purely a fact of physics (i.e. not different for different lens designs or filter manufacturers). The sky is most strongly polarised at a 90-degree angle to the direction of the sun, and less so progressivley away from that angle. An ultrawide, capable of showing a large angular portion of sky, will therefore likely pick up areas of differing degrees of polarisation. In the worst cases this will show as a dark band in the sky.

Madweasel wrote in post #11967426
It's purely a fact of physics (i.e. not different for different lens designs or filter manufacturers). The sky is most strongly polarised at a 90-degree angle to the direction of the sun, and less so progressivley away from that angle. An ultrawide, capable of showing a large angular portion of sky, will therefore likely pick up areas of differing degrees of polarisation. In the worst cases this will show as a dark band in the sky.

Thanks Mark, I suppose what I'm asking now then is, is a cpl filter a good investment for an uwa lens in terms of being able to manage this issue?

I must admit I normally avoid using them on ultrawides, because I much dislike the uneven effect. On your 17-40 you'll have less of a problem at the longer end, so it is probably still worth it.