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Kokatha man
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Reged: 09/13/09

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Saturn+ASI120MM, Good Seeing&Lotsa Detail+Wjupos!!
      #5647305 - 01/28/13 01:21 AM Attachment (1044 downloads)

Excuse my corny equation in the thread title (where "seeing" is a reciprocal that influences optimal outcomes less & less as it gets better & better... )...but tbh, as I just said to Steve in another thread: "yes, the ASI120MM leaves the Flea3 in its wake more & more imho as I continue to test & image - first with sub 5 arcsec Mars, then Jupiter and now Saturn."

After the preceding I suppose I should restate the bit about "having no material interests whatsoever in ZWOptical" - although you might say Sam "bribed" me with 2 free cameras back in early September 2012 when he sent them to me for testing..!

Yesterday morning (27th Jan local date) we targetted Zuben elgenubi.....well, I think it was! to collimate again even though it had been done a few hours earlier for Jupiter - because I find that mirror shift (possibly from primary baffle/sleeve tolerances) creates collimation shifts when slewing the C14 from one area of sky to somewhere quite different.

The plus was it was reasonably close to Saturn in the sky - the minus was that seeing wasn't fantastic and coupled with a fairly dim star it made accurate collimation hard to gauge...

Normally I would do a quick Registax processing of the diffraction rings avi "on the fly" when I thought I was "on the money" to be absolutely certain, but clouds looming in the West had me go without this task.....I can't say I regret it really because during the second avi just when we were halfway through the green channel (I shoot B-G-R for Saturn at present) clouds scuttled anymore imaging - and this second blue channel looked even better than the one in the first & only complete set..!

But regardless of all this I was pretty pleased with the image outcome where a wealth of detail is clearly evident on Saturn's disk including cloud details and spots etc.....the Encke cleanly "split" right around and various other ring details also clearly displayed - I'm now starting to get quite excited considering it is a full 3 months from opposition and it'll reach 70 degrees down here in Oz then.....seeing was "fair to good" but I've seen much better judging by DR fluctuations and scintillation!!!

As to the ASI120MM - I'm finding having 7000 frames captured in each channel a pretty hard act to discount.....and as I also said before, somehow 5000mm f/l images seem to take significant upsampling very well - although I still haven't been able to use my variable image scale fitting due to clouds etc..!

Also, I might have to retract some of what I said about the ASI120MM using the iR742nM filter.....the night before I grabbed some very respectable images using said filter with Jove at about 30 degrees - I'll post those later.

Edited by Kokatha man (01/29/13 09:17 PM)


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martus
sage


Reged: 01/03/11

Loc: Czech Republic
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Kokatha man]
      #5647314 - 01/28/13 01:35 AM

God, this is incredible! fantastic image! congratulate Darryl.

Regards,
martus


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Freddy WILLEMS
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Reged: 11/13/05

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Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: martus]
      #5647328 - 01/28/13 01:51 AM

!!!!!!!!!!! No words The Best Saturn I've seen this year !!
Congrats Darryl...
Darryl what was your capture frame rate and for how long in each channel ?


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Gupise
super member


Reged: 01/04/13

Loc: Reggio Emilia, italy
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Kokatha man]
      #5647360 - 01/28/13 02:35 AM

Great!

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BobRoss
super member


Reged: 12/31/10

Loc: Bay Area
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Gupise]
      #5647378 - 01/28/13 03:06 AM

w tee eff how?!

*re-reads*

WW TEE EFF HOW?!



Edited by BobRoss (01/28/13 03:07 AM)


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Tassydevil
professor emeritus


Reged: 08/17/11

Loc: Tasmania, Australia
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Gupise]
      #5647382 - 01/28/13 03:10 AM

Oh MY just super

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wenjha
Vendor


Reged: 09/24/08

Loc: SuZhou China
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Tassydevil]
      #5647423 - 01/28/13 05:23 AM

Congratuations! Darryl
you are the early bird who catch saturn when I still catch jupiter.
don't you need to sleep young man


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billgg
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Reged: 02/24/10

Loc: Brazil - Sao Paulo
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: wenjha]
      #5647453 - 01/28/13 06:23 AM

It's amazing Darryl!

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Kokatha man
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Reged: 09/13/09

Loc: "cooker-ta man" downunda...
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: wenjha]
      #5647469 - 01/28/13 06:36 AM

Thanks Martus, Freddy, Mirco, Bob, Graeme and Sam - most appreciated!

Freddy, I shoot at around 20% less focal length with the ASI1120MM than the Flea...this is after taking into account that 5000mm with the ASI120MM = 7500mm roughly with the Flea3.....ie, with the Flea3 I would shoot at around 9500mm.

I also make my imaging runs 7 minutes/420 seconds "in toto" with the ASI120MM.....as opposed to the 385 seconds with the Flea3 - I believe I could go a good 10-20 seconds per channel longer with the ASI120MM and still not have any worries.....I don't resort to WinJupos rgb combining with these single rgb sets (just AstraImage) although WinJupos combining might assist a tad...

With the ASI120MM I shoot 140 seconds each channel with 50fps for them all - with the Flea3 looking at last year's text file I got 55fps for the red shooting for 80 seconds.....45fps shooting for 100 seconds in green and 205 seconds at 27fps in blue...

This gave me about 4600 frames in each channel.....the ASI120MM at 800X640 resolution delivers 7006 frames in each channel and although gain might be slightly higher from a relative position 7000 frames gives you a lot a "noise-scrunching" and I suspect the noise in the ASI cam might be lower anyway...

The QE graphs tell certain things but not everything (in reference to something in Sam's thread) because although the blue and green sensitivity appears significantly higher than the icx618 up to about 640nM and lower than it after that point on the spectrum, the red channel still requires lesser gain for the ASI120MM to provide any specific histogram value...

Also, as I alluded to I might have to rethink my appraisal of the iR742nM response of the ASI120MM camera - I said it was "no slouch" but thought the Flea3 clearly out-performed it in this spectral zone.....the other night by using 800X640 and 50fps for the iR742nM I obtained some very pleasing images with Jupiter very low in the sky - it's allways good to drop the framerate back for iR imaging whether it's the Flea3 or ASI120MM.....but my (prior) appraisals on the ASI cam's iR742nM capabilities were using 512X400 (80fps) which was really being too severe on it imho..!


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Kokatha man
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Reged: 09/13/09

Loc: "cooker-ta man" downunda...
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Kokatha man]
      #5647470 - 01/28/13 06:36 AM

Thanks also Bill!

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MvZ
Carpal Tunnel
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Reged: 04/03/07

Loc: The Netherlands
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Kokatha man]
      #5647485 - 01/28/13 06:59 AM

Awesome shot!

Lets trade Jupiter for Saturn again next year ok??


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ZuoZhao
sage


Reged: 10/16/12

Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: MvZ]
      #5647559 - 01/28/13 08:14 AM

A shining Saturn!

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Rankinstudio
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Reged: 04/05/08

Loc: Southern UT
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: ZuoZhao]
      #5647663 - 01/28/13 09:33 AM

Fantastic Saturn, clean and crisp.

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Mike Phillips
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Reged: 02/21/06

Loc: Swift Creek, NC - 35.682 N, 78...
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Rankinstudio]
      #5647710 - 01/28/13 09:56 AM

Darryl, I need to set my alarm! The ASI120MM has certainly caught my eye now.

Mike


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BKBrown
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Reged: 08/23/09

Loc: Northern Virginia, USA
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Kokatha man]
      #5647759 - 01/28/13 10:31 AM

Brilliant image Darryl, the detail is incredible! Can't wait to see what you do with this combo in good seeing closer to opposition

Clear Skies,
Brian


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gfeulner
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Reged: 11/23/07

Loc: Bergen county, New Jersey
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Kokatha man]
      #5647770 - 01/28/13 10:41 AM

MAN! Damian Peach move over! Like to see one when the C14 is collimated! Fantastic. Gerry

Edited by gfeulner (01/28/13 10:42 AM)


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lcd1080
scholastic sledgehammer


Reged: 06/03/10

Loc: Maryland, USA
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Mike Phillips]
      #5647830 - 01/28/13 11:06 AM

Darryl, with resolution like that I'm wondering whether you can coax some detail out of the North Polar region as we get closer to opposition. I've got a question; how would you describe the nature of your diffraction pattern's imperfections? It looks like the rings on the right side of the image are overlapping somewhat; is that the primary issue in need of correcting?

Pete

Edited by lcd1080 (01/28/13 11:57 AM)


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Takashi
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Reged: 11/22/05

Loc: Stockholm, Sweden
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: lcd1080]
      #5647904 - 01/28/13 11:40 AM

One of the best saturn I've yet to seen!

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Space Cowboy
Pooh-Bah


Reged: 05/30/10

Loc: Cheshire, UK
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Takashi]
      #5647955 - 01/28/13 12:01 PM

Eye popping detail there Darryl! I'm feeling myself drwn to this camera more each day!

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Traveler
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Reged: 08/19/07

Loc: The Netherlands
Re: Saturn + ASI120MM Goodish Seeing=Lotsa Detail!!! new [Re: Takashi]
      #5647958 - 01/28/13 12:02 PM

Fantastic!

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