Jump to content


Photo

Saturn+ASI120MM, Good Seeing&Lotsa Detail+Wjupos!!

  • Please log in to reply
143 replies to this topic

#1 Kokatha man

Kokatha man

    Fly Me to the Moon

  • *****
  • Posts: 6883
  • Joined: 13 Sep 2009
  • Loc: "cooker-ta man" downunda...

Posted 28 January 2013 - 01:21 AM

Excuse my corny equation in the thread title (where "seeing" is a reciprocal that influences optimal outcomes less & less as it gets better & better... :question: :bow:)...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..! :question: :lol:

Yesterday morning (27th Jan local date) we targetted Zuben elgenubi.....well, I think it was! :question: :lol: 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!!! :jump: :grin:

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. :)

Attached Files



#2 martus

martus

    Mariner 2

  • -----
  • Posts: 287
  • Joined: 03 Jan 2011
  • Loc: Czech Republic

Posted 28 January 2013 - 01:35 AM

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

Regards,
martus

#3 Freddy WILLEMS

Freddy WILLEMS

    Fly Me to the Moon

  • *****
  • Posts: 7236
  • Joined: 13 Nov 2005
  • Loc: Hawaii, Honolulu

Posted 28 January 2013 - 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 ?

#4 Gupise

Gupise

    Vostok 1

  • -----
  • Posts: 125
  • Joined: 04 Jan 2013
  • Loc: Reggio Emilia, italy

Posted 28 January 2013 - 02:35 AM

Great! :shocked:

#5 BobRoss

BobRoss

    Vostok 1

  • -----
  • Posts: 116
  • Joined: 31 Dec 2010
  • Loc: Bay Area

Posted 28 January 2013 - 03:06 AM

w tee eff how?!

*re-reads* :shocked:

WW TEE EFF HOW?!

:bow:

#6 Tassydevil

Tassydevil

    Viking 1

  • -----
  • Posts: 673
  • Joined: 17 Aug 2011
  • Loc: Tasmania, Australia

Posted 28 January 2013 - 03:10 AM

Oh MY just super :bigshock:

#7 wenjha

wenjha

    Vendor

  • -----
  • Vendors
  • Posts: 732
  • Joined: 24 Sep 2008
  • Loc: SuZhou China

Posted 28 January 2013 - 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 :)

#8 billgg

billgg

    Explorer 1

  • -----
  • Posts: 65
  • Joined: 24 Feb 2010
  • Loc: Brazil - Sao Paulo

Posted 28 January 2013 - 06:23 AM

It's amazing Darryl!

#9 Kokatha man

Kokatha man

    Fly Me to the Moon

  • *****
  • Posts: 6883
  • Joined: 13 Sep 2009
  • Loc: "cooker-ta man" downunda...

Posted 28 January 2013 - 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..!

#10 Kokatha man

Kokatha man

    Fly Me to the Moon

  • *****
  • Posts: 6883
  • Joined: 13 Sep 2009
  • Loc: "cooker-ta man" downunda...

Posted 28 January 2013 - 06:36 AM

Thanks also Bill! :)

#11 MvZ

MvZ

    Surveyor 1

  • *****
  • Posts: 1579
  • Joined: 03 Apr 2007
  • Loc: The Netherlands

Posted 28 January 2013 - 06:59 AM

Awesome shot!

Lets trade Jupiter for Saturn again next year ok??

#12 ZuoZhao

ZuoZhao

    Ranger 4

  • -----
  • Posts: 300
  • Joined: 16 Oct 2012

Posted 28 January 2013 - 08:14 AM

A shining Saturn!

#13 Rankinstudio

Rankinstudio

    Mercury-Atlas

  • *****
  • Posts: 2587
  • Joined: 05 Apr 2008
  • Loc: Southern UT

Posted 28 January 2013 - 09:33 AM

Fantastic Saturn, clean and crisp.

#14 Mike Phillips

Mike Phillips

    Soyuz

  • *****
  • Posts: 3519
  • Joined: 21 Feb 2006
  • Loc: Swift Creek, NC - 35.682 N, 78.743°W

Posted 28 January 2013 - 09:56 AM

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

Mike

#15 BKBrown

BKBrown

    Gemini

  • *****
  • Posts: 3226
  • Joined: 22 Aug 2009
  • Loc: Northern Virginia, USA

Posted 28 January 2013 - 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 :grin:

Clear Skies,
Brian :waytogo:

#16 gfeulner

gfeulner

    Mariner 2

  • *****
  • Posts: 287
  • Joined: 23 Nov 2007
  • Loc: Bergen county, New Jersey

Posted 28 January 2013 - 10:41 AM

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

#17 lcd1080

lcd1080

    Viking 1

  • -----
  • Posts: 999
  • Joined: 03 Jun 2010
  • Loc: Maryland, USA

Posted 28 January 2013 - 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

#18 Takashi

Takashi

    Mariner 2

  • *****
  • Posts: 288
  • Joined: 22 Nov 2005
  • Loc: Stockholm, Sweden

Posted 28 January 2013 - 11:40 AM

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

#19 Space Cowboy

Space Cowboy

    Apollo

  • -----
  • Posts: 1045
  • Joined: 30 May 2010
  • Loc: Cheshire, UK

Posted 28 January 2013 - 12:01 PM

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

#20 Traveler

Traveler

    Apollo

  • -----
  • Posts: 1262
  • Joined: 19 Aug 2007
  • Loc: The Netherlands

Posted 28 January 2013 - 12:02 PM

Fantastic!

#21 mitovka

mitovka

    Viking 1

  • -----
  • Posts: 739
  • Joined: 08 Jun 2010
  • Loc: Slovakia, CE

Posted 28 January 2013 - 12:14 PM

Incredible!

#22 DuaneS

DuaneS

    Explorer 1

  • -----
  • Posts: 72
  • Joined: 18 Jun 2008

Posted 28 January 2013 - 12:19 PM

Amazing detail! WOW!!

Duane

#23 CanaryMax

CanaryMax

    Vostok 1

  • -----
  • Posts: 121
  • Joined: 11 Jul 2008
  • Loc: Gran Canaria, Spain

Posted 28 January 2013 - 12:47 PM

Really nice this Saturn with its moons.

#24 HANTO

HANTO

    Apollo

  • *****
  • Posts: 1152
  • Joined: 24 Aug 2007
  • Loc: Unterallgäu, Bavaria, Germany

Posted 28 January 2013 - 03:46 PM

Great shot, Darryl! Seems it´s not only a great Newtonian camera!
Did you mention your "device for amplification" (1.4 barlow)?

Regards
Torsten

#25 Timthelder

Timthelder

    Vostok 1

  • -----
  • Posts: 187
  • Joined: 12 Jun 2012
  • Loc: Bowling Green KY

Posted 28 January 2013 - 04:03 PM

Hat's off to you Daryl, That's a ripper for sure!

(wouldn't mind having some 'goodish' seeing myself!)

Cheers






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics