IIRC it was a fixed 10-stop ND.
On 19 March 2014 15:43, Chris Trask <christrask@xxxxxxxxxxxxx> wrote:
> >I don't recall the exact number but I think he ended up with a daylight
> >exposure of about 45 seconds. I understand the use of the variable ND
> >filter to reduce the brightness of the sky but I don't understand the
> >use of a 10 stop ND filter. Clearly the 10 stop ND filter is
> >responsible for the very long shutter speed but why so long. It seemed
> >to me that the clouds were moving fairly briskly and that such a long
> >shutter speed wouldn't be required to simply blur the clouds.
> >It there some other reason for using that 10 stop ND filter that I don't
> >know about?
> It's very likely that the photographer wanted precise control over
> the ND filtering, and at the 10-stop position of the variable ND filter
> fine adjustment can be very difficult. By using the ND10 filter first he
> has bracketed the lower end of the range he's interested in and then has
> fine control over his desired setting.
> When the going gets weird, the weird turn pro
> - Hunter S. Thompson
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