How to determine length of long exposures past 30 seconds?

3 months 3 weeks ago #648559 by E Rodriguez
First post here.  I'm somewhat new to photography as of 8 months ago, but just finally getting  more serious about this.  I have a Nikon D750  and one lens - 24-70mm.  

When you go with a long exposure past 30 seconds, the camera  needs to go into bulb mode.  How do you determine proper exposure after that 30 second line?  

I don't know if this makes sense, I'm trying to understand this, so if I'm terms are wrong, my  apologies.   

Thank you for any advice you can give me. 

-E 


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3 months 3 weeks ago #648590 by fmw
Most of us use a watch.


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3 months 3 weeks ago - 3 months 3 weeks ago #648602 by garyrhook
+1 on a watch/timer. Use a shutter release (wired or wireless) to control the shutter when in bulb mode. You can compute the amount of time based on a shorter exposure time and some math. Or you take a shot and chimp to see how it turned out.


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3 months 3 weeks ago #648620 by Shadowfixer1

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3 months 3 weeks ago #648629 by E Rodriguez
Thank you everyone.  So when determining the length of time that goes by, are you doing the old trial and error routine and take a few shots to see how it all works and adjust?  


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3 months 3 weeks ago #648670 by Shadowfixer1

E Rodriguez wrote: Thank you everyone.  So when determining the length of time that goes by, are you doing the old trial and error routine and take a few shots to see how it all works and adjust?  

Did you not read the link I supplied?

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3 months 2 weeks ago #649271 by E Rodriguez

Shadowfixer1 wrote:

E Rodriguez wrote: Thank you everyone.  So when determining the length of time that goes by, are you doing the old trial and error routine and take a few shots to see how it all works and adjust?  

Did you not read the link I supplied?


Sorry, I'm new here and responded before seeing your link.  That link was very helpful.  Thank you for sharing that information.  


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3 months 2 weeks ago #649893 by Tim Burg
There are a number of apps that will do the timing for you.


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3 months 1 week ago #650189 by E Rodriguez
All good, thank you!


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2 months 3 weeks ago #652042 by Jared-Weaver
PhotoPills is most folks' go to app for exposure calculation. There are a number of free exposure calculator apps out there and I'd highly recommend one instead of doing manual calculations, especially if you're shooting in dynamic conditions. 


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