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Venus, Jupiter, & Saturn 2021-11-28 big dob experiments

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#1 Ittaku

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Posted 28 November 2021 - 06:58 PM

These are not the best captures in the world considering the hardware involved, but as this was a learning experience for using a big dob they're not too bad for a first attempt with unfamiliar equipment. There were many variables that contributed to the final images not being great, including strong winds, progressively worse seeing, and heat plumes from nearby houses. The temperature was dropping and thermal equilibration may well have come into play as being limiting as well. The scope hardware was courtesy of @M11, who was responsible for collimating and driving this gorgeous scope. Focus and imaging was my responsibility.

Nonetheless, these are the native scales these images were captured in and are pleasing if not necessarily as sharp as I'd like, but you can certainly make out a lot of fine detail. As has been described, the need for an ADC becomes more apparent with more aperture, and even capturing Jupiter at 55 degrees atmospheric dispersion was quite obvious with this aperture.

 

Hardware: 24" SDM/F4 Zambuto, integrated SIPS & crayford focuser

Imaging equipment: Explore Scientific x3 focal extender, Optolong UV/IR block, ZWO ADC, ZWO ASI 485MC.

Software: Firecapture, Autostakkert, Astraimage, The Gimp.

 

Captured at FL 8100, F/13.8.

 

Venus came out nice and sharp. It probably benefited from the best conditions. Alas in visible light there still isn't much to see. I've left it in 16 bit since it's not that big a file and the phase transition is its most striking feature.

 

2021 11 28 0953 8 CK L Ven P1 ap25a5g
 
Saturn
2021 11 28 1009 3 CK L Sat limit000000 010000 P37 ap67aga

 

Jupiter

2021 11 28 1049 2 CK L Jup limit010600 016000 P33 ap75ag

Edited by Ittaku, 28 November 2021 - 06:59 PM.

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#2 wizbang396

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Posted 28 November 2021 - 08:01 PM

Yes, nothing to complain about for first use of equipment.  Venus and Saturn especially


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#3 Borodog

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Posted 28 November 2021 - 08:33 PM

Were you tracking somehow? Platform? Manual? Drift and reset?

 

There is a lot of potential in a 2' aperture.



#4 Ittaku

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Posted 28 November 2021 - 08:37 PM

Were you tracking somehow? Platform? Manual? Drift and reset?

There is a lot of potential in a 2' aperture.

It's a full altaz Goto tracking mount.

#5 Max Astronomy

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Posted 28 November 2021 - 11:37 PM

In order to this aperture will be able to show his potential, probably, her need to Everest. But pictures are nice!


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#6 Yu Gu

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Posted 29 November 2021 - 09:59 AM

Great photos for the first light. 24" F4 Zambuto would be a dream scope for planetary imaging, giving good seeing! Can you tell us more about the scope and show some photos? 



#7 Ittaku

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Posted 29 November 2021 - 03:27 PM

Great photos for the first light. 24" F4 Zambuto would be a dream scope for planetary imaging, giving good seeing! Can you tell us more about the scope and show some photos? 

Not my scope, but here it is:

https://www.cloudyni...ing/?p=11487033



#8 Ittaku

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Posted 29 November 2021 - 04:02 PM

Also you're right about it being great for planetary, but Jupiter is truly blinding looking at it through an eyepiece with this big a light bucket. It's super sharp, detailed, and large. Mars at opposition will likely burn a hole your retina.

 

I also have a (not quite as big) dob, but unlike this SDM/Zambuto work of craftsmanship, mine is an off the shelf 20" skywatcher piece of garbage for planetary. It's wonderful for collecting light and observing DSOs, but I've tried everything I can think of to get good planetary images and they are always mush. I can only conclude that the optics on it are crap. At least I've gotten good at collimating it by trying to get collimation spot on before each capture - which I then subsequently deleted.


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#9 Yu Gu

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Posted 29 November 2021 - 05:15 PM

Thanks for the information. That's a beautiful setup! Hopefully you get to use it more and take beautiful photos.
I am also working on my Newtonians (16" and 12.5" F5) and hope to get good blue channels compared to my C11.
 


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