M42 - First LRGB Ca...
 
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Mar 28 2026 APP 2.0.0-beta40 will be released in 7 days.

It did take a long time to have the work finished on this and itĀ  will have a major performance boost of 30-50% over 2.0.0-beta39 from calibration to integration. We extensively optimized many critical parts of APP. All has been tested to guarantee correct optimizations. Drizzle and image resampling is much faster for instance, those modules have been completely rewritten. Much less memory usage. LNC 2.0 will be released which works much better and faster than LNC in it's current state. And more, all will be added to the release notes in the coming weeks...

Update on the 2.0.0 release & the full manual

We are getting close to the 2.0.0 stable release and the full manual. The manual will soon become available on the website and also in PDF format. Both versions will be identical and once released, will start to follow the APP release cycle and thus will stay up-to-date to the latest APP version.

Once 2.0.0 is released, the price for APP will increase. Owner's license holders will not need to pay an upgrade fee to use 2.0.0, neither do Renter's license holders.

 

M42 - First LRGB Capture

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(@simon_rl)
White Dwarf
Joined: 9 years ago
Posts: 8
Topic starter  

This is my first LRGB capture with ASI1600 MM-C with Optolong filters. Obviously fully processed and combined in APP with some very minor tweaks in Lightroom.

combine RGB image  8degCCW 1.0x LZ3 NS csc St


   
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(@mabula-admin)
Universe Admin
Joined: 9 years ago
Posts: 5056
 

Vey nice Simon šŸ˜‰ !

Looks very nice and smooth...

Do you have more details, like which telescope and integration times per channel ?

Mabula

Ā 



   
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(@simon_rl)
White Dwarf
Joined: 9 years ago
Posts: 8
Topic starter  

Hi Mabula,

Apologies in my excitement to share my photo I forgot to include the details:

Telescope: Explore Scientific 127mm ED APO Essential Series

Mount: SkyWatcher AZ-EQ6

Camera: ZWO ASI1600MM - Cooled

Guiding: OAG, with ZWO 120MM-S

Filters: Optolong 36mm unmounted LRGB

Gain: 0 - After the level of noise in the image I wish I used unity gain (139) as most people advise.

I cannot remember details of exposures.

Darks, flats and bias subtracted.

Simon.



   
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(@gregwrca)
Black Hole
Joined: 9 years ago
Posts: 228
 

Nice image.Ā  We have the same telescope and guidescope camera 👍



   
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(@simon_rl)
White Dwarf
Joined: 9 years ago
Posts: 8
Topic starter  
Posted by: Greg

Nice image.Ā  We have the same telescope and guidescope camera 👍

Thanks Greg. How do you like your ES 127mm. I love mine, for what they cost they are fantastic and the image quality is not far behind the better scopes. I use a TS field flattener with mine and I find I get perfect stars across the whole frame.



   
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(@mabula-admin)
Universe Admin
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Posted by: Simon

Hi Mabula,

Apologies in my excitement to share my photo I forgot to include the details:

Telescope: Explore Scientific 127mm ED APO Essential Series

Mount: SkyWatcher AZ-EQ6

Camera: ZWO ASI1600MM - Cooled

Guiding: OAG, with ZWO 120MM-S

Filters: Optolong 36mm unmounted LRGB

Gain: 0 - After the level of noise in the image I wish I used unity gain (139) as most people advise.

I cannot remember details of exposures.

Darks, flats and bias subtracted.

Simon.

Thank you Simon for sharing the details šŸ˜‰

In my experience, the gain 0 setting is good for longer exposure times though šŸ˜‰ i have an asi1600 myself and have shot some excellent images with gain 0.Ā  I think the sweetspot is somewhere between gain 0 and gain 139 though...still nice dynamic range and pretty low read noise. With gain 139, the dynamic range starts to get really tight I feel. But then again, if you combine plenty of images, the dynamic range will increase from that. So it does depend a bit on the target that you're shooting on which gain to use. For a high dynamic range object like M42, I would suggest to use a lower gain then 139 šŸ˜‰

Cheers,

Mabula

Ā 

Ā 



   
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(@gregwrca)
Black Hole
Joined: 9 years ago
Posts: 228
 
Posted by: Simon
Posted by: Greg

Nice image.Ā  We have the same telescope and guidescope camera 👍

Thanks Greg. How do you like your ES 127mm. I love mine, for what they cost they are fantastic and the image quality is not far behind the better scopes. I use a TS field flattener with mine and I find I get perfect stars across the whole frame.

Indeed, well crafted. Love it.Ā  Am replacing the focuser though, as mine tends to lose focus too often when imaging, and not so good for an autofocus motor.Ā  I have been looking for a well matched FR/FF for it. Funny ES doesn't really have one. What is this TS model?



   
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(@simon_rl)
White Dwarf
Joined: 9 years ago
Posts: 8
Topic starter  
Posted by: Greg
Posted by: Simon
Posted by: Greg

Nice image.Ā  We have the same telescope and guidescope camera 👍

Thanks Greg. How do you like your ES 127mm. I love mine, for what they cost they are fantastic and the image quality is not far behind the better scopes. I use a TS field flattener with mine and I find I get perfect stars across the whole frame.

Indeed, well crafted. Love it.Ā  Am replacing the focuser though, as mine tends to lose focus too often when imaging, and not so good for an autofocus motor.Ā  I have been looking for a well matched FR/FF for it. Funny ES doesn't really have one. What is this TS model?

Hi Greg,

I upgraded my focuser to a Moonlite with stepper motor and am very happy with the quality of Moonlite.

Here's a link to the field flattener https://www.teleskop-express.de/shop/product_info.php/info/p1010_TS-Optics-PHOTOLINE-APO-Flattener-Corrector-for-Refractror-Telescopes.html



   
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(@gregwrca)
Black Hole
Joined: 9 years ago
Posts: 228
 

Funny, I'm waiting on my 3" FT also. Ordered mine in November! I'll check out the FF link. Are you at F/7.5?

Ā 



   
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(@gregwrca)
Black Hole
Joined: 9 years ago
Posts: 228
 

Argh, I don't read German. I'll check in the US.



   
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(@simon_rl)
White Dwarf
Joined: 9 years ago
Posts: 8
Topic starter  
Posted by: gdwats@comcast.net

Argh, I don't read German. I'll check in the US.

There is an English version of the web page. Just click on the UK flag near the top right hand corner of the page.



   
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