How is this effect achieved?

Long exposures using neutral density filters, they allow you to get the movement in the sky, I would also hazard a guess that there is negative exposure compensation being used as well to give the nice crisp shadows.
 
Those are primarily a long exposure done using a strong ND filter like a B&W ND110 or a Lee Big Stopper this allows you a must longer exposure as it dramatically decreases the amount of light reaching the sensor..as to processing it wouldn't surprise me if its not been processed using NIK Silver FX Pro http://www.google.com/nikcollection/products/silver-efex-pro/ as it looks reminiscent to the processing of that software...that said could easily be reproduced with a fairly high contrast B&W conversion with the clarity of the image boosted quite high too
 
Hi,
Thanks for the help on this, looks an interesting challenge. I seem to remember buying some welding glass on the recommendation that it could be used as 10 stop. Has anyone tried this or is it too poor a quality glass?
 
Duncan.F said:
Hi,
Thanks for the help on this, looks an interesting challenge. I seem to remember buying some welding glass on the recommendation that it could be used as 10 stop. Has anyone tried this or is it too poor a quality glass?
Click to expand...

Lots of people use welding glass and it can be a great cheap alternative especially if your working in B&W as it can have some seriously bad colour cast issues that can be murder to fully remove ;)
 
Forbiddenbiker said:
They don't look that long an exposure, 20, 30 seconds maybe. ...without ND filters you could just try a polariser, cheating but it works, and early morning or late evening light and use those lower light levels to add time.
Click to expand...

He spaketh sense :agree:

With long exposure images its all too tempting to go for 2 mins+ as that's the sort of exposure easily achieved with a 10-stopper on a dull day, but to get proper streaks in the sky that's often far too long and clouds can blur to just grey

I saw some FAB sea images recently and it turned out to be only 1/8th sec that was used, not the 30 secs plus I'd imagined

The really beauty about shooting such architecture shots though is that you can set up, and shoot at a whole range of exposures to just see what's working on that windy/cloudy day and adjust accordingly :)

Must have a day in Leeds and go looking to do this sometime soon

Dave
 
Thanks for all the replies, I remember a few years ago seeing a shot on TP, it won a comp as I recall. It was of a busy escalator at a station or similar and it just had a blurred stream of people rather like ants. I would love to recreate something like that!

Dunc
 
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