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delays between taking long exposures Nikon D7000


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#1 Decco20

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Posted 01 March 2018 - 01:51 PM

Hi All, I enjoy taking long exposure (30 second) astrophotography shots, the problem is that after taking a 30 second exposure the camera (Nikon D7000) seems to freeze for another 30 seconds before showing the image on the screen or allowing me to take the next shot.  It has been suggested to me that the camera is automatically taking "dark frames".  A I am not sure what dark frames are or how the improve the image.  Also can I set the camera not to take dark frames as I want to do a series of 30 second exposures to capture star trails, having a 30 second gap between each image makes this impossible.  Thanks in advance for any advise you might offer.

 

Declan



#2 480sparky

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Posted 01 March 2018 - 02:39 PM

Turn off the Noise Reduction feature. That's what is causing the delay.  The camera is taking a 'blank' image to 'map' the noise created by long exposures.  It then used that map to lower the noise in the image.

 

You can pretty much do the same thing in post.


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#3 fotofill

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Posted 02 March 2018 - 12:20 AM

Great answer... 


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#4 justshootit

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Posted 02 March 2018 - 06:08 AM

Ditto Sparky, but it's "Long Exposure Noise Reduction" that's likely causing the problem.
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#5 ericbowles

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Posted 02 March 2018 - 03:59 PM

You are using Long Exposure Noise Reduction.  It captures a dark frame that shows any hot pixels.  The hot pixels are subtracted from the original image which eliminates hot pixel noise (still as a single NEF file).  This cannot be easily replicated in post, and is a good thing.  You can eliminate an individual hot pixel, but not shading on an area of an image and not always with hot pixels depending on location.  If possible, use LENR - but don't use it all the time.  

 

Don't use LENR for star trails - the gap is too long.  Don't use it when you need to capture a sequence of images or a quick repeats.  Don't use it when you need to guess on timing and might guess wrong.  

 

You can create dark frames manually instead of using LENR.  That's what is often done for star trails as well as many night photography images.

 

I would not use high ISO noise reduction at all.  Hi ISO noise reduction can be replicated in post for NEF files.


Edited by ericbowles, 02 March 2018 - 04:00 PM.

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#6 Decco20

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Posted 02 March 2018 - 04:59 PM

Hi guys, many thanks for your replies, turned off LENR and guess what, it solves the problem :)  :)  now to nail those star trails.

 

Thanks again

 

Declan






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