The outer shell developing nicely now Brian.
Dave
Narrowband Imaging - Results for M27
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Please upload large images to photo sharing sites (flickr, etc) rather than trying to upload them as forum attachments.
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Please upload large images to photo sharing sites (flickr, etc) rather than trying to upload them as forum attachments.
Please share the equipment used and if possible camera settings to help others.
Re: Narrowband Imaging - Results for M27
All right, last night I captured one more hour of Ha. Now the Ha and OIII stacks are perfectly in balance at SNR 59 for a total SNR 84. Total integration time 6.4 hours.
Now, I'm going to concentrate on wideband stacks: LRGB. Theoretically, LRGB will add "punch" to the stars. Last night, I did capture 1 hour's worth, but it is still noisy, so when I try to mix it in with the narrowband, the noise overwhelms the delicate narrowband nebulosity. I need to put more time into it.
Narrowband status:
Ha-7nm: 51x300s bin1
OIII-7nm: 26x300s bin1
Total SNR 84
TIT 6.4 hours
Wideband status:
R: 14x150s bin1
G: 8x150s bin1
Total SNR of a 16th magnitude star: 57 (typically I like to hit SNR 100)
TIT 55 minutes
Wishlist: I want to recapture 2 hours of OIII. Guiding was awful that night.
Here is the narrowband image: And here is the wideband image (so far, still too noisy): I've had three nights in a row of clear skies. (The last two had exceptional seeing conditions.) Up all night until dawn. Tonight is iffy. I'm calling it a wrap. Unsettled weather is arriving. Probably by the time it clears, the Moon will be a factor. I don't expect to be contributing to this project for at least a couple weeks.
Thanks for reading!
Brian
Now, I'm going to concentrate on wideband stacks: LRGB. Theoretically, LRGB will add "punch" to the stars. Last night, I did capture 1 hour's worth, but it is still noisy, so when I try to mix it in with the narrowband, the noise overwhelms the delicate narrowband nebulosity. I need to put more time into it.
Narrowband status:
Ha-7nm: 51x300s bin1
OIII-7nm: 26x300s bin1
Total SNR 84
TIT 6.4 hours
Wideband status:
R: 14x150s bin1
G: 8x150s bin1
Total SNR of a 16th magnitude star: 57 (typically I like to hit SNR 100)
TIT 55 minutes
Wishlist: I want to recapture 2 hours of OIII. Guiding was awful that night.
Here is the narrowband image: And here is the wideband image (so far, still too noisy): I've had three nights in a row of clear skies. (The last two had exceptional seeing conditions.) Up all night until dawn. Tonight is iffy. I'm calling it a wrap. Unsettled weather is arriving. Probably by the time it clears, the Moon will be a factor. I don't expect to be contributing to this project for at least a couple weeks.
Thanks for reading!
Brian