Matching Lights and Darks Images

[JTWaters]

The feature request is something like LENR where a Dark is taken after the Light and automatically subtracted from the Light.  I would like to tell BYE to take a Light sub and then have it automatically take a Dark after the Light and have both images downloaded.  This feature would provide "matching" Lights and Darks for later processing.  This will aid in the final image stacking and noise reduction and result in better images.

I believe the Canon SDK can support this feature request.

[admin]

Not possible, this needs a manual intervention by the user to cover the scope between each light/dark cycle.  You would have to be cover/uncover the scope all night long.  

Did I misunderstood your request?

[astroman133]

What you are asking for is for the camera to be able to take an exposure without opening the shutter and for that image to be downloaded and labelled as a dark frame. The can already do that by means of LENR.

The biggest drawback is spending half your night shooting darks!

[JTWaters]

astroman133 - I understand the time impact.  LENR does not download the Darks.  I want temperature matching Lights and Darks downloaded for better noise reduction and PI processing.

admin - not true.  LENR takes a Dark and subtracts it from the previous Light then saves the Light.  You do not have to cover the lens.  I want them both downloaded.

[admin]

18 minutes ago, JTWaters said:

astroman133 - I understand the time impact.  LENR does not download the Darks.  I want temperature matching Lights and Darks downloaded for better noise reduction and PI processing.

admin - not true.  LENR takes a Dark and subtracts it from the previous Light then saves the Light.  You do not have to cover the lens.  I want them both downloaded.

You are mistaken.  The LENR function is a special in-camera "internal only" function.  There are no SDK commands that allows for taking an image without lifting the mirror.  What you are asking is not possible with the current Canon SDK; I say this with 100% certainty.

Regards,

[s3igell]

LENR has always been a "Black Box" - we know reasonably well what is Input and Output but not much about what is happening between.  We know that some form of Dark Subtraction "must be happening", but not the details.  (This is how the Sony A7x DSLRs ended up with the "Star-Eater" Noise Reduction problems.)

Higher-end Canon DSLRs even implement "Asymmetrical" LENR - where 1 Internal Dark is applied to 2-4 Lights in succession before another Internal Dark is taken.  All without User-control beyond setting LENR=ON.

Throughout all of this, however, the ability to take the Dark Exposure is NOT made available via Button or Command or SDK.

[dkerber]

On 7/1/2019 at 6:54 PM, admin said:

Not possible, this needs a manual intervention by the user to cover the scope between each light/dark cycle.  You would have to be cover/uncover the scope all night long.  

Did I misunderstood your request?

Or, move the filter wheel to the "darks" position, which I set up by putting black construction paper over the opening.

I would like to see BYE be able to move the filter wheel between steps of the capture plan, though...