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Saturn, 8th April 2013

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#1 Bird



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Posted 09 April 2013 - 02:43 AM

Hi all, here is an image of Saturn from this morning in reasonable seeing, quite a few light coloured features visible across the disk.

Here's a link to a luminance animation, please excuse the 0.5 pixel shift between the images in the animation, very annoying.


I've been testing an ASI-120MM-C camera for the last couple of weeks, thanks to Sam, and it does seem to be more sensitive than my Flea3 FL3-FW-03S1M and also lower noise - quite an achievement for a cmos-based camera. These images were taken with the ASI camera.

I've been using the same capture settings that I would on the flea3, and a 4x powermate instead of my normal 5x powermate (which works at 6x with the spacing). The change from 6x => 4x pretty much cancels out the pixel size difference between my Flea3 and the ASI camera and allows an equal comparison.

I also like the t-thread on the top of the ASI camera, it means I can screw it directly onto one of my favourite 2" non-tilt adapters and it fits very nicely into my imaging setup. I can change the spacing if need be with standard t-thread spacers.

The only issue at the moment - for me at any rate - is that I have to use firecapture instead of my normal Linux capture software, meaning I lose access to some things that I need (eg 2x2 binning and integration with my wheel). But Sam has promised me some programming info so I can write a Linux capture program... hopefully not too far away...

regards, Bird

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#2 Kecktastic



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Posted 09 April 2013 - 04:45 AM

A lovely image there Bird and congratulations to Sam on such a nice low noise & cool camera, a bit of a revolution happening with CMOS chips.


#3 mitovka


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Posted 09 April 2013 - 06:11 AM

Great image.

#4 hopskipson



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Posted 09 April 2013 - 06:15 AM

That's a beauty! Such nice detail

#5 John_K



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Posted 09 April 2013 - 07:06 AM

Let the Aussie imaging run continue! Nice work Anthony!

#6 Bird



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Posted 09 April 2013 - 08:00 AM

Thanks guys, it all comes down to the seeing... and tonight there are too many flashes of lightning around for me to risk setting up, so I'm having a night off...

cheers, Bird

#7 sfugardi



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Posted 09 April 2013 - 11:08 AM

Bird, gorgeous image! Nice smooth processing with excellent banding and colors. The animation shows a ton of detail moving. Keeping the noise low for Saturn while filling a good histogram is tricky. Thanks for posting


#8 lcd1080


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Posted 09 April 2013 - 12:43 PM

Another beautiful image Anthony! I was wondering why you feel that 2x2 binning at Saturn would offer an advantage; I know that binning would brighten an otherwise dim planet like Saturn but wouldn't that be offset to some extent by the loss of image scale?


#9 Mert



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Posted 09 April 2013 - 01:32 PM

That's a beautiful image Anthony, excellent detail and
colors, well done!!

#10 AstroDan2015


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Posted 09 April 2013 - 02:17 PM

Hi Anthony,

Excellent Saturn indeed, congrats!!!

Best wishes, Dan :cool:

#11 Bird



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Posted 09 April 2013 - 06:11 PM

Thanks all, nice to hear from you.

Pete, one of my filters is a narrowband methane filter - 889nm +/- 8nm, and it's very dim due to the narrow passband and low camera efficiency at that wavelength. I use the 2x2 binning for that, there is a lot of image scale reduction, but in that filter I'm only looking for large scale features anyway.

It's useful on Jupiter for showing altitudes of clouds - clouds lower in the atmosphere are darker, Jupiters atmosphere absorbs this wavelength.

It's maybe also useful on Saturn for the same reason, but Saturn is even dimmer...

cheers, Bird

#12 Az Frank

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Posted 09 April 2013 - 09:45 PM

Always enjoy the quality of your images Bird! Nicely done!

#13 wenjha



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Posted 10 April 2013 - 01:26 AM

thanks Bird!
I am trying hard to add linux support :)
And the bin2 mode I think If I remove the 640X480 ROI resolution, then can use the bin2 in FC.don't know other user's opinion

#14 Bird



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Posted 10 April 2013 - 01:58 AM

Hi Sam, I think it's important to leave the 640x480 ROI mode in fc, that's what most people are using.

It would be good to add the option of a second mode - 2x2 binned 640x480. Maybe in a future release of the ASI driver and fc?

That extra mode would give effective 7.5 micron pixels, which some people with long focal length scopes might find more convenient, eg Damian etc.

cheers, Bird

#15 Mike Phillips

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Posted 10 April 2013 - 07:47 PM

Wonderful shot Bird and as a longtime user of your capture and control s/w I might vote for Linux support too!


#16 tjensen



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Posted 10 April 2013 - 10:00 PM

Great as always Anthony.
The more I see, the more I think that the ASI-120MM might be my next camera!
Nice to see you back on the forum too.

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