Results 1 to 7 of 7
Like Tree9Likes
  • 5 Post By not_Fritz_Argelander
  • 1 Post By Nomma
  • 1 Post By DeanD
  • 2 Post By Nomma

Thread: Gso parabolic mirrors

  1. #1
    Nomma's Avatar
    Nomma is offline Bright Giants
    Points: 1,602, Level: 24
    Level completed: 2%, Points required for next Level: 98
    Overall activity: 13.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!
    Join Date
    Jan 2019
    Location
    Woodbine, ga
    Posts
    343
    Points
    1,602
    Level
    24
    Thanks
    0
    Thanked 35x 23 Posts

    Default Gso parabolic mirrors



    Doing some research as I'm hoping to buy my scope Monday.

    I went to the gso parent site and found the primaries are bk7 with aluminum coating and the Soi2 coating applied to protect the aluminum from degrigation.

    High point has the wave length listed as 1/12wavelength..

    So if we apply this to the p-v to wavelength ration we would take 1(12x3.5)^2=1764 or an rms of .01764 . Please let me know if I'm correct here.

    I'm trying to learn the scale between good optics and great optics and the effects they have on the image.
    Mike.
    100% beginner.
    Scopes: Apertura AD12 with telrad. Tasco galaxsee 45 on an equitorial mount. Vivitar 2inch refractor on basic tripod.
    Eyepieces: Apertura 30mm 2" superview. Apertura 9mm plossl. GSO 32mm plossl. GSO 1.25" 2x shorty Barlow.
    Photography: coolpixl110 on a basic tripod.

  2. #2
    12richardk's Avatar
    12richardk is offline HYPER GIANT
    Points: 15,807, Level: 86
    Level completed: 74%, Points required for next Level: 93
    Overall activity: 16.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Gallery Achievement!
    Join Date
    Dec 2015
    Location
    Johannesburg/Prague
    Posts
    4,067
    Points
    15,807
    Level
    86
    Thanks
    105
    Thanked 724x 707 Posts

    Default Re: Gso parabolic mirrors

    I am not sure of the technical park but my GSO Dobs is great value for money adjustable bearings in both alt and Az , includes a fan (i have never used it ) duel speed crayford focuser , the only thing I replaced was the 9x50 finder with a 9x50 RACI one and adder a RDF for that quick set up , great scope
    Richard
    Reflector GSO 200
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    F6
    Refractors Tasco 10 TE-5 F 15 ,
    MCT Bosma 150 F12 on a EQ5
    SCT C5 Celestron SLT Alt/AZ Go To mount,

  3. #3
    Nomma's Avatar
    Nomma is offline Bright Giants
    Points: 1,602, Level: 24
    Level completed: 2%, Points required for next Level: 98
    Overall activity: 13.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!
    Join Date
    Jan 2019
    Location
    Woodbine, ga
    Posts
    343
    Points
    1,602
    Level
    24
    Thanks
    0
    Thanked 35x 23 Posts

    Default Re: Gso parabolic mirrors

    Oh yeah I've dug In hard o. Reviews and videos the whole nine. I'm really excited I settled on it. But being one of those ppl that want to know as much as possible about what they are using and where to make it better.. I wanna figure the mirror math out lol
    Mike.
    100% beginner.
    Scopes: Apertura AD12 with telrad. Tasco galaxsee 45 on an equitorial mount. Vivitar 2inch refractor on basic tripod.
    Eyepieces: Apertura 30mm 2" superview. Apertura 9mm plossl. GSO 32mm plossl. GSO 1.25" 2x shorty Barlow.
    Photography: coolpixl110 on a basic tripod.

  4. #4
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is online now HYPER GIANT
    Points: 181,330, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 53.0%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!750 Days+ Registered Achievement!First 1000 Experience Points
    Awards:
    Thread Award
    Join Date
    Jul 2011
    Location
    US
    Posts
    21,988
    Points
    181,330
    Level
    100
    Thanks
    7,253
    Thanked 46,368x 14,931 Posts
    Blog Entries
    59

    Default Re: Gso parabolic mirrors

    Good for you! What you need to bookmark is this excellent web resource on telescope optics:

    https://www.telescope-optics.net

    https://www.telescope-optics.net/reflecting.htm

    Has all the formulas you want. It's best to pick as the wavelength of light to be 500-550 nm.
    j.gardavsky, jaetea, DeanD and 2 others like this.

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

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80 (mods for white light solar), SV ED80 f7 Newtonians: Z12 f5 Catadioptrics: VMC110L, Intes MK66 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binocular Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker III, Vixen Porta II, Celestron CG5, Orion
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    EQG

  5. #5
    Nomma's Avatar
    Nomma is offline Bright Giants
    Points: 1,602, Level: 24
    Level completed: 2%, Points required for next Level: 98
    Overall activity: 13.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!
    Join Date
    Jan 2019
    Location
    Woodbine, ga
    Posts
    343
    Points
    1,602
    Level
    24
    Thanks
    0
    Thanked 35x 23 Posts

    Default Re: Gso parabolic mirrors

    Ty!
    Mike.
    100% beginner.
    Scopes: Apertura AD12 with telrad. Tasco galaxsee 45 on an equitorial mount. Vivitar 2inch refractor on basic tripod.
    Eyepieces: Apertura 30mm 2" superview. Apertura 9mm plossl. GSO 32mm plossl. GSO 1.25" 2x shorty Barlow.
    Photography: coolpixl110 on a basic tripod.

  6. #6
    DeanD's Avatar
    DeanD is offline HYPER GIANT
    Points: 16,189, Level: 87
    Level completed: 83%, Points required for next Level: 61
    Overall activity: 19.0%
    Achievements:
    365 Days+ Registered Achievement!2 Posts Achievement20 Posts Achievement!50 Posts Achievement!750 Days+ Registered Achievement!
    Join Date
    Apr 2012
    Location
    South Australia
    Posts
    2,363
    Points
    16,189
    Level
    87
    Thanks
    271
    Thanked 731x 595 Posts

    Default Re: Gso parabolic mirrors

    It is great to know how the various numbers are calculated, but it is also worth having a look at Carl Zambuto's comments about his mirrors. He doesn't use numbers as such, but he has "7 criteria" that all his mirrors have to achieve: https://zambutomirrors.com/zambutoopticalca.html The bottom line is that they will give star tests that are effectively perfect.

    I have looked through a number of scopes with Zambuto mirrors, and there is no doubt they are excellent!

    However, having said that I have a 12" f5 GSO mirror in my otherwise home-made scope, and I have had it up and running at the same time as friends with Zambuto optics. When I bought it the manufacturer claimed that it had a better figure than those in their production-line scopes: if I remember rightly it was "better than 1/12 wave" vs their then production-line scopes which were "diffraction limited". However, I believe they have since improved their mirrors in general. It is quite thick, so it takes a while to settle down: but when it does it is not put to shame at all by the Zambuto optics... If I was to be really picky, the only difference I have been able to notice is a very slight improvement in contrast (or clarity?) with the Zambuto mirrors; and I attribute this to the smoothness of hand-figured optics vs machine figured like the GSO. There is no doubt in my mind that the GSO mirrors represent great value for money.

    Have fun!

    Dean
    j.gardavsky likes this.

    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.
    :
    12" home-made dob, Celestron 150 f5, Tak TSA102, TV 76, Celestron 800CPC, ETX 125
    Mounts:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    MiniTower, HEQ5Pro
    Binos: 25x100FB, Carton 11x80, Vanguard Endeavour 1045, Takahashi 22x60, Swarovski Habicht 8x30
    Eyepieces: My favourites are my Televue 32mm plossl, Nagler 13mm T6, Nagler 3-6mm

  7. #7
    Nomma's Avatar
    Nomma is offline Bright Giants
    Points: 1,602, Level: 24
    Level completed: 2%, Points required for next Level: 98
    Overall activity: 13.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!
    Join Date
    Jan 2019
    Location
    Woodbine, ga
    Posts
    343
    Points
    1,602
    Level
    24
    Thanks
    0
    Thanked 35x 23 Posts

    Default Re: Gso parabolic mirrors

    Awesome I talked to highpoint yesterday about possibly having it flocked before sent to me. They can't :/ but once I told him my sky conditions he said there was really no point just to flock adjacent to the focuser. His reasoning was because of my conditions. He also said it's an amazing scope that it should do amazing where I'm at.
    DeanD and bladekeeper like this.
    Mike.
    100% beginner.
    Scopes: Apertura AD12 with telrad. Tasco galaxsee 45 on an equitorial mount. Vivitar 2inch refractor on basic tripod.
    Eyepieces: Apertura 30mm 2" superview. Apertura 9mm plossl. GSO 32mm plossl. GSO 1.25" 2x shorty Barlow.
    Photography: coolpixl110 on a basic tripod.

 

 

Similar Threads

  1. Spherical vs Parabolic and more?
    By Walk7 in forum Astronomy Beginners Forum
    Replies: 19
    Last Post: 10-11-2013, 09:23 PM
  2. Spherical and parabolic mirrors
    By Gabriel315 in forum Astronomy Beginners Forum
    Replies: 17
    Last Post: 12-16-2011, 02:35 PM
  3. Why Are Mirrors So Thick? And What About Polycarbonate Mirrors?
    By Looking_Glass in forum ATM DIY Telescope Making Forum
    Replies: 16
    Last Post: 11-05-2009, 08:48 PM
  4. spherical mirrors matching the curve of parabolic
    By jtaylor in forum Amateur Astronomy Forum
    Replies: 16
    Last Post: 04-29-2005, 01:38 AM
  5. Looking for 4" Parabolic Mirrors Supplier
    By matt in forum Amateur Astronomy Forum
    Replies: 17
    Last Post: 11-29-2004, 02:21 PM

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 08:43 PM.