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My 2nd Image of the season - NGC7635 - Bubble Nebula
- CarlightExpress
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- lunartic_old
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- Nerro
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12 years 3 months ago #95097
by Nerro
Replied by Nerro on topic Re: My 2nd Image of the season - NGC7635 - Bubble Nebula
Another exelent one Simon!You are raising the bar quite high for us 
well done.
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- dave_lillis
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12 years 3 months ago #95106
by dave_lillis
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor
Replied by dave_lillis on topic Re: My 2nd Image of the season - NGC7635 - Bubble Nebula
fab image !!
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)
Carrying around my 20" obsession is going to kill me,
but what a way to go.
+ 12"LX200, MK67, Meade2045, 4"refractor
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- dmcdona
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- CarlightExpress
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12 years 3 months ago #95108
by CarlightExpress
Hi Dave
I take my flats using an EL panel, or I use the sky (if it's clear), I have also used an illuminated blank wall before as well, and try and aim in Nebulosity to have the peaks about 1/3 across the histogram by adjusting the exposure times, I would use the AV FLat mechanism in BackyardEOS but that would mean opening up the cooler box and switching the dial to AV which I do not really want to do
The number of darks is dependent on wether the camera is cooled or not, with the cooled camera since the standard deviation doesn't really change betweeen the darks, I result in only having to do around 19, before I got into cooling the camera I used to have to take at least 45 darks.
The number of flats I typically go for 45+ because they take no time at all to grab (the longest part is the downloading of the image fromt he camera
Simon
Clear Skies
Simon
www.flickr.com/photos/30345959@N08/
www.astrobin.com/users/CarlightExpress/
Replied by CarlightExpress on topic Re: My 2nd Image of the season - NGC7635 - Bubble Nebula
dmcdona wrote: Simon
Out of interest, how did you decide on the numbers of cal frames (darks and flats)? And how do you take your flats? And how long did the processing take you?
The image itself is very good indeed. It just shows how the DSLR cameras are able to admirably compete with CCD's.
Dave
Hi Dave
I take my flats using an EL panel, or I use the sky (if it's clear), I have also used an illuminated blank wall before as well, and try and aim in Nebulosity to have the peaks about 1/3 across the histogram by adjusting the exposure times, I would use the AV FLat mechanism in BackyardEOS but that would mean opening up the cooler box and switching the dial to AV which I do not really want to do
The number of darks is dependent on wether the camera is cooled or not, with the cooled camera since the standard deviation doesn't really change betweeen the darks, I result in only having to do around 19, before I got into cooling the camera I used to have to take at least 45 darks.
The number of flats I typically go for 45+ because they take no time at all to grab (the longest part is the downloading of the image fromt he camera
Simon
Clear Skies
Simon
www.flickr.com/photos/30345959@N08/
www.astrobin.com/users/CarlightExpress/
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