SL2 in camera Dark Frame Issue

[sgdaswtc]

Having an issue with the in camera "Long Exp. Noise Reduction" option. Only one exposure is taken in the series. Sometimes it indicates it is aborting. Other times it just does not take the second image. Log says "Imaging session completed successfully". Playing around with different exposures the option works for up to 12 second exposures. Beyond that it does not work. BYE is set to "In-Camera" option. I have "Pause" set to 5 seconds plus beyond the dark frame exposure.  Is it something I am doing wrong with regards to the settings?

Thanks,

Steve

[admin]

Your post is confusing, sorry

Does it work without Long Exposure enabled?  I can't tell from your post if you tried this or not. 

BTW, long exposure noise reduction is a myth that people seems to think they need.  Creating a dark library is much more efficient and gives you more time to take more light frames.

Regards,

[sgdaswtc]

17 hours ago, admin said:

Your post is confusing, sorry

Does it work without Long Exposure enabled?  I can't tell from your post if you tried this or not. 

BTW, long exposure noise reduction is a myth that people seems to think they need.  Creating a dark library is much more efficient and gives you more time to take more light frames.

Regards,

BYE works fine otherwise. I am loving it.  The problem is only when LENR is enabled. Funny that the issue is with exposures longer than 12 seconds. Looks like I will need to start a dark library.

Thanks,  Steve

[admin]

I don't get the 12 seconds thingy either.  It does not make any sense

[s3igell]

There's a lot of debate over the use of LENR for DSLR AP Imaging. 

The proponents claim that LENR ensures that the Darks are as near the Same Temp of the Lights as possible - since DSLR Sensors Heat-up over the course of an Imaging Run and are otherwise unregulated self-cooling.

The detractors (including myself and Guylain et al) claim that the Loss of Imaging Time for all those 1-to-1 Dark Exposures is more important - since one can process well with 10-15 Darks against a stack of 40-60 Lights (or more).  (And: many of the Canon and Nikon DSLRs don't support LENR via their SDK, making it difficult for BYE/BYN and other Apps to know what is going on when the Camera simply "remains busy" for several minutes after it has signaled that the Exposure has ended...)

 

[astroman133]

In fact there are some who say that with modern DSLR cameras, dark frames are not even necessary.

See the article at the following link for more information --> http://www.clarkvision.com/articles/dark-current-suppression-technology/

[s3igell]

On 6/17/2019 at 4:38 PM, astroman133 said:

In fact there are some who say that with modern DSLR cameras, dark frames are not even necessary.

See the article at the following link for more information --> http://www.clarkvision.com/articles/dark-current-suppression-technology/

Dark Current is only one element of AP Image Processing which is addressed by Clark's evaluation.  (And while I proudly own - and sometimes AP Image with - a "best Dark Current Suppression available" 7D Mark II, I still collect DARK and BIAS and FLAT Frames.)

DARK Frames also address Warm and Hot Pixels as well as Fixed Pattern Noise and Amp Glow.  Now, few modern DSLRs have serious Amp Glow.  And Pattern Noise is partially addressed by Dithering.  And Hot Pixels can be caught by some of the more sophisticated Stacking Algorithms (as long as Aggressive Dithering is used).  But, overall, DARK Frames are still a significant element of Stacking / Calibrating for AP Images with DSLR Camera Images.