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Thread: 8" vs 10" + astronomy photos

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    Default 8" vs 10" + astronomy photos



    Hey guys & girls, first post here. I bought a neglected 8" & decided ill buy a new one.
    Couple of basic questions (sorry for the newbie questions)

    I was looking at an 8" dobsonian, but was recommended the 10". Will it make that much more of a difference? The price isnt too much more although i think id rather put more towards a GOTO (8")

    Second question, can you mount a DSLR to a dob or will it be too heavy? I have no experience whatsoever with dobs and wasnt sure if it will be too heavy.

    Thanks in advance!

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    Default Re: 8" vs 10" + astronomy photos

    Hello and welcome to the forums Tmz
    The 8" is a good all round starter scope. A 10" will have a bit more light grasp but will also be bulkier so depending on where you will be viewing that could be a factor.
    Hope fully some of the AP guys will be around shortly to answer some of your questions.
    Brodavid1953 likes this.
    Refractors: Antares 105mm f/15, Bresser 102mm f/13, Celestron 102mm f/6.5, 2-150mm f/8, Stellarvue NHNG 80mm f/6.9, Teleskop-Service 102mm f/11, Vixen ED115S f/7.7
    Mounts: Celestron CG-5, ASGT, SLT, Manfrotto Az/Alt, Skywatcher EQ-2, Vixen SXP Binoculars: Celestron, Vixen
    Eyepieces: A-Z

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    Default Re: 8" vs 10" + astronomy photos

    Welcome to the forum.

    A 10" is superior to an 8" for visual observing.

    A Dob is extremely unsuitable for astrophotography. You will not be able to bring a DSLR to focus. You will not be able to track objects as they move. Even if you get a goto dob which can track, field rotation that is inherent in the alt-az mount will cause star trails.

    You might be able to mount a video or planetary camera and get it to focus, in which case you would be able to shoot video-based images of the Moon and planets. But neither Dob really has enough focal length for that.

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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: 8" vs 10" + astronomy photos

    As Kathy said, it's not for a DSLR and only the simplest point and shoot type of lunar/planetary imaging can be done with it using a video capture camera. For those lunar shots it will be good. For planetary, the image scale will be very small and disappointing. I would not even try to image with it at all. GREAT visual scope though.
    LX200 ACF 8"SCT(Supercharged), Apertura AD12, Celestron C6A SCT, ES 102CF Apo triplet, ES AR102, ST90, Apex 90mm Mak, ST80(modified), ETX60, Oberwerk 25x100s, 15x70s, 8x56s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount, Canon T5, Meade DSI2 Pro, Phillips webcam, Explore Scientific 30mm, 24mm, 18mm, 14mm, 11mm, 8.8mm, 6.7mm 82 degree EPs, ES 24mm, 20mm, 16mm 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader Moon&SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, and lots of astro stuff.

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    Default Re: 8" vs 10" + astronomy photos

    Thanks for the quick replies & help. I live in a city with a lot of light polution. Sadly it will be 99% of the time used in the backyard. The EPs that came with the telescope are
    - GSO 25mm plossl
    - GSO 15mm plossl
    - Celestron 10mm wide
    - GSO 9mm plossl
    - GSO 6mm plossl
    - no name 4mm + SVBONY 4mm plossl
    Will these do for now or should i upgrade?

    Thanks, now im leaning towards a 10" dob for now (not goto) & can look at getting a different setup later for photos. Theres so much to see & learn first.

    One more question, id prefer a collapsible for storage, do these need more adjustments ( or do you just extend & collimate them)?

    Sorry for the newb questions & thanks again for the help.

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    Default Re: 8" vs 10" + astronomy photos

    GSO Plossl are actually good eyepieces so not a worry there.
    The 4mm will probably be pushing the magnification a bit but if the skies are good it may work.

    I have not owned a collapsible so cannot help you with those questions.
    Enjoy your scope in the meantime.
    Refractors: Antares 105mm f/15, Bresser 102mm f/13, Celestron 102mm f/6.5, 2-150mm f/8, Stellarvue NHNG 80mm f/6.9, Teleskop-Service 102mm f/11, Vixen ED115S f/7.7
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    Default Re: 8" vs 10" + astronomy photos

    I own a SW 8 inch collapsible and so far have only needed to collimated it once as it came out of the box.
    It survives portage and travel very well.
    My only complaint-well not really a complaint-it is what it is: The DOB base is quite heavy for me. My hands are becoming a little arthritic and painful.
    I guess for a spritely young lad (lass?) as yourself it will be a breeze
    I love it for visual but never attempt AP. Can't reach focus with my DSLR. I have other scopes for AP.
    I also fitted it out with a laser pointer-an essential accessory IMHO.
    CR 6 150 mm f8 refractor . AVX mount. 80mm guide scope with Nexguide. Canon EOS rebel 3 Ti DSLR. Canon Rebel XS DIY modified I- Optron skytracker. Sky Watcher 8 inch collapsible Dob. 30 mm, 25 mm ,20 mm, 15 mm, 10 mm ,8.8 mm EPS plus plus plus. Cometron 12 x 70 binos. Sky Watcher PRO ED 80 mm. Canon XS modded. Lots of hope.

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    Default Re: 8" vs 10" + astronomy photos

    Thank you all for the information & help! Much appreciated ��

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    Default Re: 8" vs 10" + astronomy photos

    I just bought an older 250mm OTA and took it apart to clean.
    On rebuilding I moved the main mirror forward to the alternative fixing holes to give me an extra 15mm of back focus.
    Yesterday I got the Canon 450d into focus with ~25mm to spare on the focusing tube.

    That means I did not need to move the mirror forward for this camera and it's T2 adaptor + nose piece.

    Why would a Dobsonion not be able to focus?
    Scopes: Explore Scientific ED 127mm APO and Orion Optics UK europa 250mm Newtonian, Mount: Sky-Watcher EQ6 pro with SynScan go-to, Eyepieces: Explore Scientific 68degree 2" 40mm & 28mm, 1.25" 16mm, Barlow: Altair 2" 2x, Diagonal: Altair 2",
    Homemade Finder based on 200mm f3.5 camera lens + 25mm plossl.

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    Default Re: 8" vs 10" + astronomy photos

    I watched a YouTube video on stacking multiple pics from a Dobsonian.
    The tracking followed the target.
    But as Kathy said the rotation, required and as given by a GEM, was not there.
    The pics each needed to be rotated to bring all the targets into alignment. The software did this automatically.
    The resulting central area that was in all the pics was a lot smaller than the whole camera field.
    The stacking that was used gave a very good smaller final pic.
    Scopes: Explore Scientific ED 127mm APO and Orion Optics UK europa 250mm Newtonian, Mount: Sky-Watcher EQ6 pro with SynScan go-to, Eyepieces: Explore Scientific 68degree 2" 40mm & 28mm, 1.25" 16mm, Barlow: Altair 2" 2x, Diagonal: Altair 2",
    Homemade Finder based on 200mm f3.5 camera lens + 25mm plossl.

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