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I have recently brought a DSLR with intervalometer and trying to take a long expxosure photo. But when I set the shutter to 'BULB' mode, F5.6 and ISO AUTO in Manual mode.Now, with all settings at 00:00:00, am getting a nice clear picture. But when I set the LONG to any value and start the timer, my view finder gets closed, the resulting photo is nothing but full white. To check any problem with the intervalometer, disconnected it and set the shutter speed to 30 sec. Even now the photo is nothing but white. How do I get the effect desired?

marked as duplicate by mattdm, inkista, Michael C, scottbb, Philip Kendall Sep 13 '16 at 19:52

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    You ask "how to get the effect desired' — but what effect is desired? – mattdm Sep 10 '16 at 5:24
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If your photo is all white it is over exposed. What are you taking a picture of? The night sky? Or a bright daylight scene? And while i frequently use auto iso , i don't use it for long exposures, certainly not bulb. I'd start by setting a low iso value, say 100, then raise it as needed.

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