Results 1 to 6 of 6
Like Tree10Likes
  • 4 Post By KathyNS
  • 3 Post By Ozman13
  • 1 Post By CamelHat
  • 1 Post By stewe
  • 1 Post By CamelHat

Thread: Telescope type recommendation, reflector or schmidt-cassegrain?

  1. #1
    grandkodiak's Avatar
    grandkodiak is offline White Dwarf
    Points: 32, Level: 1
    Level completed: 64%, Points required for next Level: 18
    Overall activity: 0%
    Join Date
    Aug 2019
    Location
    NJ
    Posts
    1
    Points
    32
    Level
    1
    Thanks
    0
    Thanked 0x 0 Posts

    Default Telescope type recommendation, reflector or schmidt-cassegrain?



    Hello,

    I'm getting back into astronomy and astrophotography to a small degree with my dslr camera, so I bought a Meade 114EQ f8.8 1000mm of craigslist last year. It's been great other then the horrible focus system that makes sharp focus nearly impossible without lots of fidgeting the imprecise small knob.

    Anywho, I'm looking to upgrade to a new scope and for budget I'm probably moving to Celestron and I think the Advanced VX 8" newtonian reflector or the same scope in the Schmidt-Cassegrain for a few hundred more are within budget possible by the end of summer. Size doesn't bother me, but the f/10 of the schmidt bothers me for photography goes... but I'm very new to astrophotography so I'm hoping for some experienced input.

    My issue is that I'm near Asbury Park in NJ, so the light pollution is about as bad as you can get. Also with the trees and local geography, 95% of my viewing area is generally low east from the horizon to vertically overhead, with little north or south and no west unless I drive a half mile to the local school parkinglot/field. So I know for the most part cool deep sky imaging is not really going to be an option, although in the winter the sky opens up a lot better. Things like pleiades become more detailed and foggy over the usual just mass of pinpoints... and you can ALMOST see andromeda through the lens. Mostly I like to look at the planets and moon as even on crappy atmospheric nights the light pollution in with no haze or clouds is tolerable.

    so given all that, what would be my best route? right now i have an adapater to get my dslr into the eyepiece holder which is ackward and shakey but I dont see another way. I had an ETX125 maybe a decade and a half ago but I was a novice at everything, but the camera mounted directly to the back of the telescope and i remember it being far more sturdy and vibration resistant, so thats why I was thinking even with the worse f-stop that a schmidt might be the better option?

    thanks all!!

  2. #2
    KathyNS's Avatar
    KathyNS is offline Super Moderator
    Points: 173,468, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 70.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts AchievementGot three Friends
    Awards:
    Reply Award
    Join Date
    Nov 2010
    Location
    Nova Scotia
    Posts
    25,193
    Points
    173,468
    Level
    100
    Thanks
    6,660
    Thanked 14,989x 9,545 Posts
    Blog Entries
    3

    Default Re: Telescope type recommendation, reflector or schmidt-cassegrain?

    Welcome to the forum. I would encourage you to read this: Before you sign up... Important Notice!!.

    An 8" Newtonian on an AVX is a good scope for visual observing, but it is too much weight for the mount for astrophotography. Also, using a DSLR on a Newt is problematic: typically, you can't get the camera sensor close enough to focus it. Some Newts will allow DSLR focusing, typically by having a removable eyepiece holder or extension tube. However, I do not know if the Celestron scope has that capability.

    An 8" SCT on an AVX is also a good visual scope, and has serious potential for planetary AP. You would typically use a barlow and a (video) planetary camera. With the slow focal ratio and the long focal length on a relatively light mount, it would be difficult to use it for DSO AP, though a focal reducer might help a bit.

    Rather than buying a "package", you are better off buying the mount and scope separately. The most important part of an AP setup is the mount. You should budget 2/3 of your funds for the mount and what is left over for the scope. When sizing the components, take the published weight capacity of the mount and divide by two. That is your target maximum for all the rest of your equipment: scope, camera, finder, guider, etc.. You will go a bit over that 50%, but you don't want to go past about 60-70% of the published capacity.

    A really good combination for beginner AP is a sturdy mount with a lightweight, fast refractor. I know you were unsatisfied with the focuser on your Meade, and at f/8.8 it was a bit too slow anyway. There are a lot of great f/4 and f/5 refractors that are excellent AP platforms.
    Last edited by KathyNS; 08-10-2019 at 12:51 PM.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.


    DSO AP:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    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
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    (pier);
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    .

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  3. #3
    Ozman13's Avatar
    Ozman13 is offline HYPER GIANT
    Points: 29,217, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 20.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!365 Days+ Registered Achievement!50 Posts Achievement!
    Join Date
    Jun 2013
    Location
    Hopkinsville Kentucky
    Posts
    8,431
    Points
    29,217
    Level
    100
    Thanks
    170
    Thanked 2,238x 2,011 Posts

    Default Re: Telescope type recommendation, reflector or schmidt-cassegrain?

    As Kathy noted, and I completely agree, neither of those scopes are ideal for imaging with (other than planetary with the SCT).

    The AVX is a nice imaging mount for a small fast refractor, and that type of scope is ideal for DSO imaging.

    If it were me, I would get the AVX, an APO or ED refractor, a decent pair of binoculars (VERY IMPORTANT!), and an 8" Dob for visual use while the imaging rig is at work (gets pretty boring just watching it work), and of course you NEED a comfortable variable height observing chair.
    bladekeeper, stewe and Maceemiller like this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8"SCT,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60,
    Oberwerk BT-82XL-ED, 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount
    Explore Scientific 82 degree and 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    &SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.

  4. #4
    CamelHat's Avatar
    CamelHat is offline Bronze Supporter
    Points: 52,475, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 21.0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!First 1000 Experience Points2 Posts Achievement20 Posts Achievement!
    Join Date
    Dec 2011
    Location
    Santa Barbara, CA
    Posts
    5,809
    Points
    52,475
    Level
    100
    Thanks
    1,170
    Thanked 1,720x 1,388 Posts

    Default Re: Telescope type recommendation, reflector or schmidt-cassegrain?

    Look for geethq to see what can be achieved with an 8" astrograph on an AVX. I think he's exceptionally good but he has shown that it can work well when done right.

    http://www.astronomyforum.net/member...-f4-d5300.html
    KathyNS likes this.
    ... Henk. Telescopes: 6" Mak-Newt (Comet Hunter), ES ED127CF, ES ED80, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: Losmandy G11S, AVX, LXD55, Tiltall, Cameras: Fuji X-a1, Canon SX40, Xt, XSi, T6, ELPH 100HS, DIY: Dob and camera barndoor trackers, afocal adapter, Dob with foldable base and Az/Alt setting circles, Accessories: SSAG, Plossls, Barlows, Telrad, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  5. #5
    stewe's Avatar
    stewe is offline White Dwarf
    Points: 920, Level: 17
    Level completed: 20%, Points required for next Level: 80
    Overall activity: 12.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!365 Days+ Registered Achievement!
    Join Date
    Jan 2019
    Location
    Heidelberg, Germany
    Posts
    42
    Points
    920
    Level
    17
    Thanks
    12
    Thanked 6x 6 Posts

    Default Re: Telescope type recommendation, reflector or schmidt-cassegrain?

    I agree with the others in the sense that I would not use the same instrument for both AP and visual. Having said that, you can consider using the SCT with a focal reducer or in "fastar" mode at ~f/2 (the camera will be expensive) for AP. At native f/10 with the AVX it will be cumbersome. Or some manufacturers have scopes intended to be used for both AP and visual, for example Explore Scientific's Maksutov-Newton, which appears a bit like a mule to me, but I have never tried it. Anyway, using a fast, rich field scope for visual under polluted skies is not something I would recommend.
    Ozman13 likes this.

  6. #6
    CamelHat's Avatar
    CamelHat is offline Bronze Supporter
    Points: 52,475, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 21.0%
    Achievements:
    50 Posts Achievement!5 Threads Achievement!First 1000 Experience Points2 Posts Achievement20 Posts Achievement!
    Join Date
    Dec 2011
    Location
    Santa Barbara, CA
    Posts
    5,809
    Points
    52,475
    Level
    100
    Thanks
    1,170
    Thanked 1,720x 1,388 Posts

    Default Re: Telescope type recommendation, reflector or schmidt-cassegrain?

    Quote Originally Posted by stewe View Post
    for example Explore Scientific's Maksutov-Newton, which appears a bit like a mule to me, but I have never tried it.
    Lol a mule? I have one and love it for AP, like having a 6" Apo, very flat field too. It is also great for visual, and it's a bargain!
    Ozman13 likes this.
    ... Henk. Telescopes: 6" Mak-Newt (Comet Hunter), ES ED127CF, ES ED80, Zhumell Z12, Coulter Odyssey 10, AT6RC, Venture RX-7, Celestron Skymaster 20x80, Mounts and tripod: Losmandy G11S, AVX, LXD55, Tiltall, Cameras: Fuji X-a1, Canon SX40, Xt, XSi, T6, ELPH 100HS, DIY: Dob and camera barndoor trackers, afocal adapter, Dob with foldable base and Az/Alt setting circles, Accessories: SSAG, Plossls, Barlows, Telrad, laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software: DSS, ImageMagick, PHD, Nebulosity, Photo Gallery, Gimp, CHDK

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

 

 

Similar Threads

  1. Help choosing a Schmidt-Cassegrain telescope :)
    By samwise in forum Catadioptric Telescope Forum
    Replies: 16
    Last Post: 11-14-2016, 05:28 PM
  2. Schmidt/Cassegrain telescope
    By levekerik in forum Astronomy Forum
    Replies: 10
    Last Post: 09-15-2015, 09:47 AM
  3. Schmidt Cassegrain Telescope
    By admin in forum Astronomy Wiki
    Replies: 0
    Last Post: 06-10-2012, 08:53 AM
  4. Celestron Schmidt-Cassegrain Telescope. Which one?
    By Mel in forum Telescope Forum
    Replies: 2
    Last Post: 08-01-2008, 10:39 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBulletin® Version 4.2.0
Powered by vBulletin®
All times are GMT. The time now is 02:03 PM.