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NGC 3718 in LRGB


DaveS

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Well that looks pretty impressive to me.  I've been struggling with the same galaxy group, and I have to say my efforts with an OSC cmos camera are poor by comparison.  Although  imaging from a Bortle 4/5 location,  I'm plague by high humidity levels which makes these faint objects so hard to capture.

 

Roy 

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Yeah, those tidal tails are *very* faint, barely above the noise floor.

 

I'm in a Bortle 3/4 location, but only a mile from the sea so humidity can be stupidly high.

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Indeed Peter.

It didn't help matters that my initial set of flats were badly underexposed, due to not taking enough care over the decimal point in the histogram display, Dur...

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8 minutes ago, geoflewis said:

You may think that it's not perfect David, but it is a cracking, deep image and worth all the trials and tribulations you had getting there. Really well done.

Thanks Geof.

I may have been unconsciously comparing my image to the ultra-deep images I've seen from dark, high, and dry locations, and done with bigger 'scopes.

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5 minutes ago, DaveS said:

Thanks Geof.

I may have been unconsciously comparing my image to the ultra-deep images I've seen from dark, high, and dry locations, and done with bigger 'scopes.

Yeah, such comparisons will always leave one disappointed. I'd be pretty stoked to have that one in my collection.

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8 minutes ago, DaveS said:

Thanks Geof.

I may have been unconsciously comparing my image to the ultra-deep images I've seen from dark, high, and dry locations, and done with bigger 'scopes.

I had exactly the same issue Dave, I wanted more blue and to get the tails in and I tried so hard because I had seen it present from darker sites and eventually relented that from Wolverhampton you ain't going to be able to get that deep.

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That is a great effort Dave on this target,better than mine. I didn't get the tidal tails showing. I imaged it 12 months back ,this has given me inspiration to have another crack at it again when the opportunity arises.

 

Bob.

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After @geoflewis pointed out some misalignment is the stars i had another go using the Coregister function in AstroArt rather than the simpler Alignment. This corrected for a slight lateral chromatic aberration. I also applied a bit of unsharp mask and denoise, with masks to hold the detail in the galaxies and avoid unsharp mask from messing up the background.

 

1337833972_NGC3718forComp.thumb.jpg.46d1c4610c99a3c92ad7fbfa3345167b.jpg

 

This might be as far as I can push this data set. This is a JPEG, the PNG is 68 MB, and the FITS more like 168 MB.

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