Is it possible to set exposure time greater than 30 seconds while using interval shooting? I know we could set the interval, number of intervals and number of shoots I each interval but i can't find anything to set the length of exposure. Please help!

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    Possible duplicate of How can I set an exposure time over 30 seconds with a DSLR? – scottbb Mar 10 at 6:08
  • I know I would need a external timer or bulb mode with remote release to have an exposure over 30 seconds. But that was not my question. When I heard that there is intervalometer functionality in D750, I assumed I would need to buy one, but then, wth, I now need one. – Vamsi Mar 14 at 3:16

No, the shutter will not go longer than 30 seconds unless you use Bulb shutter mode with an external timer that allows longer than 30 seconds. Then in Bulb mode, the timer can control it. There are several external such timers available for $20 to $25, search Amazon for Interval Timer D750.

If using the camera interval timer, you just set whatever shutter speed the camera can do, up to 30 seconds. Be aware that 30 seconds is actually 32 seconds, so the interval will need to be 33 seconds.

To avoid that causing a stir from readers, I should add that camera shutters MUST have speeds in the sequence of 1, 2, 4, 8, 16, 32 seconds, each exactly 2x longer, so that each stop is exactly 1 EV. Same for fractional speeds, the actual times must be 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512, 1/1024 seconds, etc. This is simply how digital works, each shutter speed is exactly 2x. Has to be that way. The marked numbers are simply nominal values, for the convenience of humans.

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    Not all camera makers follow the full stop sequence with regard to shutter times longer than one second. Some actually time the 15 and 30 second exposures at 15 and 30 seconds. The difference between 30 and 32 seconds is only about 6% or less than 1/10 stop. – Michael Clark Mar 13 at 4:50
  • It is about impossible to imagine that a camera with a digital timer (with a cpu chip) does not do the 2x steps required for EV. – WayneF Mar 13 at 15:25
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    Not as impossible as it is to explain to too many camera owners that their "expensive" entry level camera that they spent their "hard earned cash" on isn't defective because it requires 32 seconds to take a 30 second photograph. – Michael Clark Mar 13 at 15:31
  • If that could possibly be true, those are surely camera choices to avoid buying, if they cannot even get the first basics right. :) – WayneF Mar 13 at 15:45
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    @WayneF Film speeds, shutter times, and apertures have never been anywhere near the precision of 1/10 stop for the vast majority of the history of photography. Neither has the output of most artificial light sources, much less natural ones. If you want lab grade equipment, buy lab grade equipment. You might be surprised at how much the actual shutter times vary from the ideal of your Nikons. – Michael Clark Mar 14 at 4:27

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