Why no digital ISO50 ?

Started Nov 17, 2012 | Discussions thread
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Gordon W
Gordon W Veteran Member • Posts: 3,771
Variable ND Filter

Mark_A wrote:

Digital has been very impressive in getting clean high ISO sensitivities but in some parts of the world there is no shortage of light. In those parts it may be impossible to get wide open narrow aperture pics without the use of multiple filters and the like.

So, why no ISO50 on dslrs?

And then in another posting, you wrote...

In Spain at Christmas I wanted to get a one second exposure, so I went to ISO100 (my lowest) and then f32 I think, (my smallest aperture on that lens), even then I was way too fast so I fitted a couple of grad filters then a thick polariser and even then I was not quite as slow as I wanted to be.

So even ISO50 wouldn't have gotten you the slow speed you were wanting. As others have said in this thread, neutral density filters are the best option to get long exposures during daylight.

That said, not long ago I bought a Variable ND Filter (a.k.a. a Fader Filter). These are continuously variable from 2 to 8 stops, so I now only have to carry one ND filter.


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Regards, Gordon
Photography since 1950 • Digital since 1999
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