Long exposure

[tones]

Hi all, 

 

I was doing some long exposure photos last night and i noticed that anything over 8sec long it will pop this 'processing' screen and takes a very long time. ( 30-40 sec)...  6" exposure works pretty quick. Its anything over 8.    I don't think there's much difference in the 'processing' times between 8" or longer exposures like 20" ( there may be a difference, but hard to tell ) 

 

Im sure there's a scientific answer to this. Anybody noticed this or knows why?

 

BTW. i was using power grip on boost mode.

 

Cheers!

[addicted2light]

Do you by any chance have "Long exposure noise reduction" active? If so, the camera will capture a dark frame after your main exposure, and that takes the same amount of time your exposure was, plus additional time for the camera to subtract the dark frame from the original shot (i.e. to remove the thermal noise).

Edited September 17, 2016 by addicted2light

[tones]

HA!  That makes a lot of sense. I do have Long Exposure NR ON...  Its weird how it only does it only on exposures longer than 8s. 

 

 I'll turn it off and see how it goes... Maybe, is worth keeping on... 

 

Thanks a lot. 

[addicted2light]

You're welcome!

 

I usually don't have the patience to wait all that additional time, so I keep it off...on the other hand I don't shoot that many long exposures