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Crab Nebula with a 10" newt


R1k
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Messier 1 - Crab Nebula Supernova Remnant

Photographed from my home in Bortle 6 North West England

18/3/22 and 20/3/22

My first deep sky image from home for a while and I am really pleased with it!

 

Equipment:

- Skywatcher EQ6-R pro

- Skywatcher 10 inch f4 Quattro

- Skywatcher Aplanatic coma corrector

- Skywatcher Evoguide 50ED + ZWO ASI 120MM-mini

- ZWO ASI 294MC pro

- ZWO EAF

- Optolong L-eXtreme

- Pegasus Powerbox advance

 

Acqusition:

- Lights: 55 x 240s at gain 125, offset 30, cooled to -15c

- Darks: 30

- Flats: 30 + 30

- Darkflats: 30+30

 

Processing:

- APP, PS, StarXterminator, Topaz

 

Messier 1 - Crab Nebula

 

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Amazing detail there :)  Cracking image

Can you post a single sub as I am playing with this target at F8 2000mm and getting nowhere near this detail.

 

Edited by Catanonia
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1 hour ago, Catanonia said:

Amazing detail there :)  Cracking image

Can you post a single sub as I am playing with this target at F8 2000mm and getting nowhere near this detail.

 

Here’s a single uncalibrated 4 minute sub

C27C7E9B-E36A-4C0E-8905-476E46878AEB.jpeg

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6 minutes ago, R1k said:

Here’s a single uncalibrated 4 minute sub

 

wow, that is a cracking sub :)

So 4mins at F4, I would need 4x that for a F8.

I took over 200 subs at F8 2000mm and got nowhere near the detail you did. 

Nice work

Edited by Catanonia
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2 minutes ago, Catanonia said:

wow, that is a cracking sub :)

So 4mins at F4, I would need 4x that for a F8.

I took over 200 subs at F8 2000mm and got nowhere near the detail you did. 

Nice work

Thanks very much, I was really pleased. I think I’ve hit a sweet spot with this setup (294 and 10” f4 newt). Image scale is 0.96 arc sec/pixel which helps.

 

What bortle class are you shooting from? I assume you’re using an RC10? 

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4 hours ago, R1k said:

Thanks very much, I was really pleased. I think I’ve hit a sweet spot with this setup (294 and 10” f4 newt). Image scale is 0.96 arc sec/pixel which helps.

 

What bortle class are you shooting from? I assume you’re using an RC10? 

Bortle 6 as well. 

Using a RC 10 inch open truss @F8 2000mm with a ZWO 2600MC Pro (no filters)

I think that is 0.78 arc/pix but not 100% sure as always confused how to work it out

I am on the limit of CCD suitability, but I do have very good guiding with EQ8-R and PHD RMS of around 0.4

I am experimenting with the 0.67 reducer tonight to get that down to 1340,mm @F5.3 (ish)

 

BTW : I am south Cheshire - Sandbach so not that far from you

Edited by Catanonia
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1 hour ago, Catanonia said:

I think that is 0.78 arc/pix but not 100% sure as always confused how to work it out

Pixel size (um) / focal length (mm) * 206.265

So for you, that's 3.76/2000*206.265 = 0.39, although you should probably double that you account for the reduced resolution on a colour sensor, so yes, 0.78.

5 hours ago, Catanonia said:

So 4mins at F4, I would need 4x that for a F8.

Not exactly - F ratio is basically irrelevant in imaging; what matters is image scale, and this is dictated by pixel size and focal length.

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