Results 1 to 9 of 9
  1. #1
    fogfire's Avatar
    fogfire is offline HYPER GIANT
    Points: 51,092, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts Achievement100+ Threads Achievement!
    Join Date
    Jun 2011
    Location
    Lynnwood WA, USA
    Posts
    3,200
    Points
    51,092
    Level
    100
    Thanks
    1,408
    Thanked 1,683x 1,047 Posts
    Blog Entries
    4

    Default Diagonals.. What do you like



    I have a new (barely used) Meade DS2090 coming from eBay for my daughter in a few days. One thing I have read is that it has a very dim diagonal.
    So I was going to give her my stock Celestron 1.25" to use and then I have an excuse for a new 2" SCT Diagonal for me

    I have been reading threads about mirror vs prism and dielectrics and Quartz mirrors.. and nothing definitive. Except the people who spent $200 or more are very dedicated to their choice. Not happening this year for me.

    I just sold some gear.. but can't go crazy.. right now my best price appears to be the house brand Pro-Optics SCT from Adorama.. for about $70.. Claims 99% reflectivity etc.

    What are people's experiences with diagonals?
    Ken H. sharing the sky with my 9yr old daughter
    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.

    ZEQ25GT - w/Meade 10" SN F4 1000MM "BIG Linda!" * w/Astro Tech AT65EDQ "Tiny Rosa"
    4SE & 6SE to be named *
    Meade Star Navigator 102 "Blue Bird" Daughter's Scope

    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.
    Lynnwood Sky Guess
    Check out my most recent Blog "Ken's Personal Update - 4-2-2013"

  2. #2
    Widespread's Avatar
    Widespread is offline Bright Giants
    Points: 4,593, Level: 46
    Level completed: 22%, Points required for next Level: 157
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!365 Days+ Registered Achievement!First 1000 Experience Points50 Posts Achievement!5 Threads Achievement!
    Join Date
    Mar 2011
    Location
    Bowling Green, KY
    Posts
    283
    Points
    4,593
    Level
    46
    Thanks
    146
    Thanked 180x 78 Posts

    Default

    I'm a noob, but from what I can tell, you're right: there doesn't seem to be much definitive consensus. Except: if you mount heavy stuff, a 2" provides much better support.

    Other than that:
    Some say that for dielectrics, a 2" is better for 1.25 EPs because there is a bigger sweet spot, but I've also read that good 1.25s have oversized mirrors to compensate.

    Some say they see a big brightness difference between their stock and high-end diagonals, others not so much.

    FWIW, I recently purchased a Televue 1.25. To my eyes, it did look a little brighter, but I've only used it once and haven't had a chance for an A/B comparison yet . But, man, it's a pleasure to use, with a nice big ergonomic spindle knob on the right-hand side.

    I think Meade has a 2" dielectric for about $160. I seem to recall that the photo showed the knob on the left side (I could be wrong). Either way, a single knob blows away those two annoying screws on my stock Celestron diagonal.

    That's about all I got. Maybe more knowledgeable folks will weigh in.
    Celestron 8SE

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80
    Oberwerks 15x70 & Orion 9X63 binos

  3. #3
    jenniferchristine's Avatar
    jenniferchristine is offline Jedi Moderator
    Points: 76,152, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 8.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience PointsGot three Friends20+ Friends Achievement!
    Join Date
    Oct 2010
    Location
    Ormeau SEQld Australia
    Posts
    11,249
    Points
    76,152
    Level
    100
    Thanks
    580
    Thanked 4,791x 3,198 Posts

    Default

    The 1.25meade as supplied with a new scope is AWFUL - it's also a prism - I would have thought a decent prism would be excellent - this one wasn't.
    I bought a 2" both for its rigidity and reflectivity.
    When I put it in the difference was more light - a lot more light.
    Worth doing
    NEQ6 Pro Mount.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8" and
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" emc, Canon 450D (Rebel XSi) 18-55 and 75-300 lenses. Canon 70DW 18-135 USM and sigma 70-300. 4000 lens kit.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Starshoot Autoguider.
    Saxon 100 f9 Apo. Saxon20x80 Binoculars. Meade ext 125 Mak

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    102 x F5 guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    /wide field scope. 10x10 shed with dome. Sky watcher sky adventurer mount.

  4. The Following User Says Thank You to jenniferchristine For This Useful Post:

    fogfire (08-11-2011)

  5. #4
    fogfire's Avatar
    fogfire is offline HYPER GIANT
    Points: 51,092, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience Points400+ Posts Achievement100+ Threads Achievement!
    Join Date
    Jun 2011
    Location
    Lynnwood WA, USA
    Posts
    3,200
    Points
    51,092
    Level
    100
    Thanks
    1,408
    Thanked 1,683x 1,047 Posts
    Blog Entries
    4

    Default

    Quote Originally Posted by jenniferchristine View Post
    The 1.25meade as supplied with a new scope is AWFUL - it's also a prism - I would have thought a decent prism would be excellent - this one wasn't.
    I bought a 2" both for its rigidity and reflectivity.
    When I put it in the difference was more light - a lot more light.
    Worth doing
    And you have a serious scope..
    This just may be me.. but I keep getting the idea that While Meade makes the right configs for serious astronomy and the OTAs are clearly good. They keep getting caught taking shortcuts like that and I read about QA issues with items like the zoom.

    I see Celestron with limited accessories.. and fewer options .. but a more consistent product QA with even stock items being of good quality

    Just an impression I am getting from reading not to be confused with the truth.
    Ken H. sharing the sky with my 9yr old daughter
    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.

    ZEQ25GT - w/Meade 10" SN F4 1000MM "BIG Linda!" * w/Astro Tech AT65EDQ "Tiny Rosa"
    4SE & 6SE to be named *
    Meade Star Navigator 102 "Blue Bird" Daughter's Scope

    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.
    Lynnwood Sky Guess
    Check out my most recent Blog "Ken's Personal Update - 4-2-2013"

  6. #5
    jenniferchristine's Avatar
    jenniferchristine is offline Jedi Moderator
    Points: 76,152, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 8.0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!First 1000 Experience PointsGot three Friends20+ Friends Achievement!
    Join Date
    Oct 2010
    Location
    Ormeau SEQld Australia
    Posts
    11,249
    Points
    76,152
    Level
    100
    Thanks
    580
    Thanked 4,791x 3,198 Posts

    Default

    My scope isn't so serious at the moment - it has quite a sense of humour.
    It decided to play hide the star the other night - then it went walkabout ( perhaps it's aborigine...) and wouldn't settle down - I gave up in the end - when I checked it out, it appeared to be the RA clutch not tightening properly.
    NEQ6 Pro Mount.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ACF 8" and
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" emc, Canon 450D (Rebel XSi) 18-55 and 75-300 lenses. Canon 70DW 18-135 USM and sigma 70-300. 4000 lens kit.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Starshoot Autoguider.
    Saxon 100 f9 Apo. Saxon20x80 Binoculars. Meade ext 125 Mak

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    102 x F5 guide
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    /wide field scope. 10x10 shed with dome. Sky watcher sky adventurer mount.

  7. The Following User Says Thank You to jenniferchristine For This Useful Post:

    fogfire (08-10-2011)

  8. #6
    sxinias's Avatar
    sxinias is offline Super Moderator
    Points: 321,612, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 8.0%
    Achievements:
    Got three Friends20+ Friends Achievement!First 1000 Experience Points5+ Referrals Achievement!100+ Threads Achievement!
    Awards:
    Attachments Award
    Join Date
    Nov 2008
    Location
    Marathon Greece summer Tampa Florida winter
    Posts
    17,795
    Points
    321,612
    Level
    100
    Thanks
    4,581
    Thanked 10,187x 6,472 Posts
    Blog Entries
    4

    Default

    The DS2090AT is a very nice telescope optically. Its plastic focuser is very poor and is the telescope's weakness; definitely something you will want to open up and adjust/modify properly.

    The weak focuser makes weight considerations (eyepieces and diagonal) more of a concern than for most scopes. The scope came bundled with a 5 piece eyepiece kit when new. The eyepieces are not high quality but are light weight and adequate for the telescope.

    I've used my Celestron C6S 1.25 inch diagonal in my DS2090AT with no problems at all. Whether or not it really improved the view is questionable.

    I recently purchased a 1.25 inch, 99% mirror, diagonal from William's Optics. The other night I did some one on one comparisons between it and the stock C6S diagonal using my 8 inch LX200 OTA while viewing an open cluster. To me the stars were slightly sharper and a tad bit brighter with the Williams diagonal ... again could be wishful thinking but I think not.
    SXINIAS

    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.
    ZEQ25 mount;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    SynScan AZ
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Mount;

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST-80A 80mm Refractor (OTA); Meade
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    203mm SCT (OTA);
    Meade DS2090AT 90mm Refractor; Meade 2045LX3 102mm SCT;

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    4 SE 102mm MAK; Celestron Advanced Series C6S (XLT) 150mm SCT
    with an iOptron GOTO Drive

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

  9. The Following User Says Thank You to sxinias For This Useful Post:

    fogfire (08-11-2011)

  10. #7
    norskeob's Avatar
    norskeob is offline Main Sequence
    Points: 2,065, Level: 28
    Level completed: 65%, Points required for next Level: 35
    Overall activity: 0%
    Achievements:
    365 Days+ Registered Achievement!First 1000 Experience Points750 Days+ Registered Achievement!50 Posts Achievement!5 Threads Achievement!
    Join Date
    Aug 2010
    Location
    New York
    Posts
    59
    Points
    2,065
    Level
    28
    Thanks
    1
    Thanked 13x 10 Posts

    Default

    GSO 2" 90-deg 99% Dielectric Mirror Diagonal for SCTs - agenaastro.com
    Attached Images Attached Images
    Celestron NexStar 8SE with Ron’s Rail Mod, Denkmeier S1 diagonal, GSO 8x50mm RACI and Feathertouch SCT MicroFocuser
    Celestron Power Tank and Celestron Dew Shield
    Eyepieces: 35mm Pan. (with Televue eye guard extender), GTO Proxima 31mm, 28mm ES, 20mm Nagler T5, 13mm Nagler Type 6, 9mm Nagler Type 1,
    StarDust Observing Chair
    Orion UltraView 10x50 Wide-Angle Binocular

  11. The Following 2 Users Say Thank You to norskeob For This Useful Post:

    fogfire (08-11-2011),NevadaPic (08-20-2013)

  12. #8
    Joe Lalumia's Avatar
    Joe Lalumia is offline HYPER GIANT
    Points: 61,001, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    200+ Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!Got three FriendsFirst 1000 Experience Points20+ Friends Achievement!
    Join Date
    Jun 2010
    Location
    Quinlan, Texas
    Posts
    10,947
    Points
    61,001
    Level
    100
    Thanks
    6,772
    Thanked 5,156x 3,400 Posts
    Blog Entries
    1

    Default

    Just buy yourself a 2 inch dielectric SCT diagonal-- several good brands out there -- GSO, Astro Tech, Televue, William Optics etc etc--

    The dielectric coating is very tough and does not deteriorate over time-- and it reflects 99% of the light.

    Some standard diagonals only reflect 85-90% of the light, while "enhanced" diagonals are around 95-97%.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    8" LNT, 10x50, 15x70mm binoculars, Stellarvue binoviewers, solar filters for all three
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ..... plus a bunch of ham radios... Ham radio call sign - W1XWX

    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.
    TelescopeMan Web Site

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    search for W1XWX to see my amateur radio web site

    "If you can't explain it to a six year old, you don't understand it yourself.” - Albert Einstein

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

  13. The Following User Says Thank You to Joe Lalumia For This Useful Post:

    fogfire (08-11-2011)

  14. #9
    WWPierre's Avatar
    WWPierre is offline HYPER GIANT
    Points: 64,445, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    10 Days registered3 Years + Achievement400+ Posts AchievementGhost Achievement! Averaging 5+ posts a day!1000 Days+ Registered Achievement!
    Join Date
    Jun 2009
    Location
    Squamish B.C.
    Posts
    6,948
    Points
    64,445
    Level
    100
    Thanks
    1,095
    Thanked 2,953x 1,808 Posts

    Default

    Since I use my scopes so much for terrestrial viewing, I am investing in an Olivon 2" prism diagonal. It is apparently from the same source as the Williams Optics diagonal.
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

    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.

    We have been broadcasting our presence to the Universe for 100 years now. If there is a detachment of Galactic Pest Control within 100 light years, they are already on the way.

 

 

Similar Threads

  1. Diagonals
    By josmith16 in forum Astronomy Beginners Forum
    Replies: 9
    Last Post: 07-18-2011, 12:50 AM
  2. diagonals
    By misterfixall in forum Telescope Eyepieces Forum
    Replies: 7
    Last Post: 06-20-2010, 12:55 AM
  3. diagonals
    By misterfixall in forum Celestron Telescope Forums
    Replies: 7
    Last Post: 10-28-2009, 02:00 AM
  4. Diagonals
    By Some guy in Arizona in forum Amateur Astronomy Forum
    Replies: 5
    Last Post: 06-05-2006, 09:21 AM
  5. Best value diagonals
    By khatcat@hotmail.com in forum Amateur Astronomy Forum
    Replies: 0
    Last Post: 08-29-2005, 01:59 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 03:09 AM.