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Thread: Critique my M66?

  1. #1
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    Default Critique my M66?



    Hi everyone,

    I've been a member in this forum for as along as ive been interested in astronomy. I've gone back and forth with mounts and telescopes and guiding, balancing, drifting techniques and still am. I've got a long ways to go but I wanted to ask what you guys thought of this image I was able to produce. Here's my equipment list:


    AVX
    SW 80ED APO
    Orion SSAG
    Canon 700D
    IDAS LPS 2" Filter
    FF/FR


    My question is: The image looks okay and im quite happy with it considering how frustrated I started with astro imaging. Its comprised of 3x28" subs under suburban skies. I noticed however that despite my best efforts so far, my guiding error goes up to 1" but is generally within 0.5. Would anyone know what is an acceptable error for my setup with regards to the available FOV? The RA gives the most errors whilst Dec almost doesnt have any. What is the solution to improving RA guiding?

    m66 final.jpg
    "Pao"
    Manila, Philippines
    "Absence of evidence is not evidence of absence" - Dr. Carl Sagan

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    Default Re: Critique my M66?

    From what I have learnt on here you will need a lot more images stacked and also longer exposures. Still you got some good detail in there and your focus looks good too.
    Nexstar 5se, Skywatcher Startravel 80T,Skywatcher EQ5 Synscan, 0.63 focal reducer, revelation 15x70mm, canon 600D.

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    Default Re: Critique my M66?

    Considering the small amount of data you have, that is an excellent image. If you stack 100 of those, you'll have an awesome image.

    To tighten up the RA, you might want to check your balance. If the rig is too well balanced, backlash can start causing movement that is too fast or jerky for the guider to guide out. Most folks leave the east side (either the scope or the counterweights, whichever is on the east side) a little heavier than the west side, just to take up any backlash. You could also PEC-train your mount.
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    DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier);
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    Default Re: Critique my M66?

    Another thing to consider- Just look at the stars. They will tell you everything you need to know about your guiding. Looking at your image, your guiding is pretty good, the stars are quite tight and round... and there are some nice, delicate details showing in all three of the galaxies. You are imaging at approximately 1.48 arc sec/px... meaning that corrections up to 1" are well within acceptable range. Anything over 1.48" is when you may want to rethink your guiding.

    The ED80 and SSAG are a great combination that should allow you to image up to 10mins per sub with little to no trailing. I did this in Diego Garcia (also close to the equator) with Orion ED80 (same specs) & SSAG with good success.

    Great shot!

    Mike
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    Mike Chartrand
    Celestron 8" Edge HD, WO Star 71, Orion ED80 & ST-80 on a Skywatcher NEQ6 Pro
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    Default Re: Critique my M66?

    What is the solution to improving RA guiding
    Boy when you find an answer to that question let me know. My mount is giving me fits lately!
    chartram and depratnt like this.
    Scopes: Home brew 6" Dob, Orion XT8G, Orion 130mm APO Triplet, Orion 8" f3.6 astrograph, atop a Orion Atas pro AZ/eq-G - Guiding: Orion 60mm f4 scope, Orion 'Star Shoot' autoguider camera, PHD2 software - Cams: Orion MP5 planetary ccd, Cannon Rebel SL1 (EOS 100D), BYEOS software, ATIK 383L+ Processing : Regisax, Deep Sky Stacker, Star Tools Assistant: One very large cat


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    Default Re: Critique my M66?

    Looks great! You off to a very start with that equipment.

    Clears,
    Joe
    In lumine tuo videbimus lumen

    SCOPES: DIY f/4.5 17.5” Dob -- Meade f/9 102mm APO
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    CAMERA: Canon 450D / Orion-SSAG / Fujifilm X-A1 (mirrorless)
    EPs: TV Nagler 13mm / PARKS Gold Series--5 pieces / Zhumell 3mm

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    Default Re: Critique my M66?

    Very good for such short exposures. Shoot for at least 15-25 5 minute exposures at ISO 800 to bring out some real wispy details especially in the "Hamburger". Have fun out there!
    My eyes
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    Default Re: Critique my M66?

    Keith, thanks for the input! Was wondering if you meant 3min x 100 subs? Im imaging in rather light polluted skies and I did try 4min subs with 1600 iso but the histogram was washed out. People say I should do 10-15min subs. I guess I need to head out to a dark site for that, huh?
    "Pao"
    Manila, Philippines
    "Absence of evidence is not evidence of absence" - Dr. Carl Sagan

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    Default Re: Critique my M66?

    Hi Leveye! Thanks for the feedback. Was wondering if it were possible to shoot that long subs in rather light polluted skies? I tried imaging at 1600iso and 4min subs but it was too washed out and the image just looked white :/
    "Pao"
    Manila, Philippines
    "Absence of evidence is not evidence of absence" - Dr. Carl Sagan

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    Default Re: Critique my M66?

    Try backing off the iso to 800

    As far as guiding within 1" to me that is perfectly acceptable, my mount wanders out to 2" occassionaly but the stars still look decent. Then again it is only f7 so.
    Scopes: Home brew 6" Dob, Orion XT8G, Orion 130mm APO Triplet, Orion 8" f3.6 astrograph, atop a Orion Atas pro AZ/eq-G - Guiding: Orion 60mm f4 scope, Orion 'Star Shoot' autoguider camera, PHD2 software - Cams: Orion MP5 planetary ccd, Cannon Rebel SL1 (EOS 100D), BYEOS software, ATIK 383L+ Processing : Regisax, Deep Sky Stacker, Star Tools Assistant: One very large cat


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