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Old 05-01-2019, 02:42 AM
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astronobob (Bob)
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Bortle 6 - no LP Filter - Orion

Always been reluctant to doing mono - and wont be in the foreseeable future, PC's are frustrating Rgrds 'astro' for this duck..

This is actually the very 1st attempt at a deepsky target from the Cosmo-Caboose, should be called the 'smoCo caboose'.

So I spends a previous night guesstimating exposure limits amongst Bortle 6 skies without a LP filter taking subs between 1 & 3 minutes in 15 sec increments and found 2 mins to be reasonably showing the limit of faintest dust collectable without too much sky glow in the background. Other factors such as nearby clouds, atmospheric moisture, time of night ect I'd suspect would/should/could effect the exposure length on a given night ?

This image was taken through the 8" Orion F/4 , with the Baader MPCC and a QHY10 Color Cam @ -20 deg.
The stack consist of only 11 subs of 2 mins due to incoming white things floating around up there.

Notes made for Equipment: 1) MPCC Air-Gap not critical as only experimenting. 2) Collimation - not bad. 3) Chip Squareness to light path - not bad.
Operator of equipment 4) Neq6p worked flawlessly.

Sky Conditions: Bortle 6; Seeing 3/5 top layer - 2/5 bottom layer; Cloud cover 30%; Humidity 85 %; 1 day prior New-Moon

Processing: DSStacker & PS CS3
Notes: Colour Gradients around perimeters due to excessive stretching in these 'outfield zones' attempting to find some or any signal.

Conclusion, can only go so deep with this gear & conditions - Next effort/opportunity will be adding LP Filter.
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Old 05-01-2019, 07:33 AM
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multiweb (Marc)
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To get the outer faint stuff you might do 10min subs and a few hours of them. Also flat fielding will help reveal all the brown neb.
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Old 05-01-2019, 08:03 AM
RyanJones
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Hi Bob,

I'm eagerly awaiting the filter image to see the comparison. I live in Bertole 7-8 skies and I'd like to be able image more from home. I'm looking forward to seeing the difference the filter makes.

Which filter are you planning on using ?
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Old 06-01-2019, 02:19 AM
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astronobob (Bob)
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Quote:
Originally Posted by multiweb View Post
To get the outer faint stuff you might do 10min subs and a few hours of them. Also flat fielding will help reveal all the brown neb.
Yes Marc, 10 mins would turn out white frames with out filters
.
.

Quote:
Originally Posted by RyanJones View Post
Hi Bob,

I'm eagerly awaiting the filter image to see the comparison. I live in Bertole 7-8 skies and I'd like to be able image more from home. I'm looking forward to seeing the difference the filter makes.

Which filter are you planning on using ?
Gidday Ryan, hmm Bortle 7-8 thought I had it tough
Will be trying with both a Omega DGM GCE Contrast filter & also a Baader UHC-S ?
Hope they turn up some interesting results - when the clouds-take-a-hike
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Old 06-01-2019, 10:32 AM
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Yes Marc, 10 mins would turn out white frames with out filters
ha.... ok. I thought you were imaging from around Esk and Bortle was some kind of German beer. There you go then... you've got your flats sorted out.
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Old 06-01-2019, 10:47 AM
Placidus (Mike and Trish)
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Brave to attempt it from such a bright location.

There seems to be some vignetting. Are you using flats? You can do flats retrospectively and reprocess the image.

Even without that, your result is much better than you think: if you carefully model the non-nebulous background and subtract most of it (we had a go on a copy), you get a crisp dark (but not clipped) background and beautiful nebulosity.

Great stuff.
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Old 07-01-2019, 01:52 PM
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ha.... ok. I thought you were imaging from around Esk and Bortle was some kind of German beer. There you go then... you've got your flats sorted out.
Ah Marc, your a worry, typical beer drinkers
But yeah, never done flats or bias before to this day, tho should consider or atleast try them to experiment for comparisons.
cheers
----------------------------------------


Quote:
Originally Posted by Placidus View Post
Brave to attempt it from such a bright location.

There seems to be some vignetting. Are you using flats? You can do flats retrospectively and reprocess the image.

Even without that, your result is much better than you think: if you carefully model the non-nebulous background and subtract most of it (we had a go on a copy), you get a crisp dark (but not clipped) background and beautiful nebulosity.

Great stuff.
Hi Placidus,
I have never bothered with flats yet, tho should get around to it I believe. and yes, I was rather content with how the nebulosity processed out under the conditions, definitely some incentive for imaging 'with a color camera' from the suburbs.
Appreciate your comments there
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Old 07-01-2019, 02:02 PM
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Originally Posted by astronobob View Post
Ah Marc, your a worry, typical beer drinkers
But yeah, never done flats or bias before to this day, tho should consider or atleast try them to experiment for comparisons.
cheers
Flats will make a big difference with all your gradients. Didn't you use to image from around Gatton before?
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Old 07-01-2019, 02:48 PM
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Flats will make a big difference with all your gradients. Didn't you use to image from around Gatton before?
Ill have to make a light box or similar, or try the ol 'T' shirt method for starters.
I used to have the 'Bob'servatory' out at Leyburn, 50klms NthWst of Warwick several years ago, sold it ! Bortel 1.5-2 skies, but problematic getting out there frequently enough to warrant the effort & generally not as dedicated as some/most
Cheers ...
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Old 07-01-2019, 04:35 PM
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Quote:
Originally Posted by astronobob View Post
Ill have to make a light box or similar, or try the ol 'T' shirt method for starters.
I used to have the 'Bob'servatory' out at Leyburn, 50klms NthWst of Warwick several years ago, sold it ! Bortel 1.5-2 skies, but problematic getting out there frequently enough to warrant the effort & generally not as dedicated as some/most
Cheers ...

Get an electro Luminescent sheet. Got some USB powered ones. They're pretty cool, thin, light, easy to store.
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Old 07-01-2019, 09:32 PM
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Cheers Marc, just ordered one, within australia.
Thanx for your help
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Old 07-01-2019, 11:41 PM
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Cheers Marc, just ordered one, within australia.
Thanx for your help
What a great idea. Can I ask where from in Australia ?
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Old 08-01-2019, 05:12 AM
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What a great idea. Can I ask where from in Australia ?
Try this link, I had to log in to get it, tho if no go, copy and paste the item description into ebays search window, should do it ?

https://www.ebay.com.au/itm/253749815559
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Old 08-01-2019, 06:45 AM
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Try this link, I had to log in to get it, tho if no go, copy and paste the item description into ebays search window, should do it ?

https://www.ebay.com.au/itm/253749815559
Got mine here
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Old 08-01-2019, 10:52 PM
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Thanks guys
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