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04-22-2010, 11:46 AM   #1
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Why is ISO lower with the bulb (k-x)?

On the tech specs for the K-x and ISO it has:

200-6400 (1, 1/2, 1/3 EV steps), up to 1600 in Bulb, expand to 100-12800

why does it change with the bulb? Doesn't bulb here mean the remote picture taking? It doesn't mean flash does it? Thanks.

04-22-2010, 12:25 PM   #2
Ira
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QuoteOriginally posted by justtakingpics Quote
On the tech specs for the K-x and ISO it has:

200-6400 (1, 1/2, 1/3 EV steps), up to 1600 in Bulb, expand to 100-12800

why does it change with the bulb? Doesn't bulb here mean the remote picture taking? It doesn't mean flash does it? Thanks.
B will stay open as long as you hold the shutter down. You can expand the sensitivity ISO to 100 to 12800 by having Dynamic Range turned on, but Highlight Correction OFF.

They probably stop it at 1600 for bulb because anything above that with long exposures (many seconds or minutes even) would do weird things with noise reduction. Plus, if you're shooting bulb for long exposures, you can just hold it longer anyway and not need the extra ISO sensitivity above that.
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