Page 1 of 4 123 ... LastLast
Results 1 to 10 of 31
Like Tree77Likes

Thread: Questions about my new eyepieces.

  1. #1
    baward85's Avatar
    baward85 is offline White Dwarf
    Points: 472, Level: 9
    Level completed: 44%, Points required for next Level: 28
    Overall activity: 7.0%
    Achievements:
    2 Posts Achievement5 Threads Achievement!20 Posts Achievement!365 Days+ Registered Achievement!
    Join Date
    Jul 2018
    Location
    Utah
    Posts
    13
    Points
    472
    Level
    9
    Thanks
    0
    Thanked 2x 2 Posts

    Default Questions about my new eyepieces.



    I just received my order for two new eyepieces to go with my new Orion Xt6 telescope. I got a Meade 4000 32mm FL Super Plossl for deep sky objects and an Orion 9mm FL Expanse eyepiece to replace my 9.7mm plossl(which had terrible eye relief) for moon/planets.

    I don't have my Orion XT6 collimated yet because I'm still waiting for the collimation tool I ordered to come in the mail. So I tested them out using my F/5 Refractor during the daytime.

    The problem I have with 32mm FL plossl is that It has way too much eyerelief. Or atleast without glasses. It's fine with glasses though. I want to have an eyepiece that is good with both eyeglass and non-eyeglass usage. The advertised Eyerelief on Meade's site is 26mm. There was another simliar 32mm Plossl eyepiece by Astro-Tech that has an advertised eye relief of 20mm. I was wondering if It was worth it to return the Meade and get the Astro-Tech instead. Would 6mm ER be much of a difference?

    The problem with the 9mm FL Orion Expanse is that. When looking through it, I kept seeing a bunch of black boomerang shaped splotches which i believe is what is reffered to as kidney beaning. Would this only be a problem during the day through a fast telescope? Would it be less of a problem through my slower F/8 reflector at night?

    Any advice? I would really appreciate it.

  2. #2
    SpyderwerX's Avatar
    SpyderwerX is offline Neutron Sequence
    Points: 23,026, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 32.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jan 2015
    Location
    upstate SC
    Posts
    4,454
    Points
    23,026
    Level
    100
    Thanks
    1,913
    Thanked 1,247x 990 Posts

    Default Re: Questions about my new eyepieces.

    The "kidney bean" effect is a spherical aberration typically caused by the eyepiece that produces an exit pupil that is not on a flat plane. Usually you can experiment and move your eye into a position where the center of the image is clear, and then to an area where the edges become more clear. This shows some common aberrations and covers "Spherical aberration of the exit pupil". https://www.telescope-optics.net/eye...erration_2.htm You may possibly notice a bit, or sometimes quite a bit of difference between day and night viewing. It's all about the light cone exiting the eyepiece and the convergence of it with the eye pupil.

    Eye positioning can really be tricky sometimes on the longer eye relief EPs. It does becomes much easier with practice and experience. About half my EP collection is the older 'smoothie' type, with no eye guards, so I've had to really learn and adapt to the hovering technique. Sometimes I prefer it, sometimes not. It's really a personal preference and comfort thing. One option would be to use something like a bicycle inner-tube and cut a section that would allow you to roll it up or down to achieve that perfect positioning/contact point.

    Edited to add: When at the link above, be sure to page forward and backward through the pages and information there, as much of ties directly together with the topic at hand.
    ~Frankie~ My mind: Always on...Slightly off.
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Celestron CPC1100 SCT...Orion Atlas EQ-G (EQ6) & Celestron AVX...
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    180 Mak...SkyWatcher ST150 & ST102...Orion ST80
    TeleVue Everbrite & Baader BBHS mirror and prism diagonals
    EPs: TeleVue (NJ) Plossls, Widefields, Panoptics and Naglers + 3-6 zoom: ...volcano top (T) Orthos & Kellners...Leitz Periplans...TeleVue, Astronomik, Lumicon & Baader filters..

  3. The Following User Says Thank You to SpyderwerX For This Useful Post:

    rickg18704 (01-10-2019)

  4. #3
    Fleegal's Avatar
    Fleegal is offline White Dwarf
    Points: 685, Level: 13
    Level completed: 70%, Points required for next Level: 15
    Overall activity: 1.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!
    Join Date
    Jul 2018
    Location
    Victoria, Australia
    Posts
    49
    Points
    685
    Level
    13
    Thanks
    15
    Thanked 7x 7 Posts

    Default Re: Questions about my new eyepieces.

    Hi, I use bst starguider eyepieces for that very reason, excellent value and great eye relief, about the same for every eyepiece in the series
    16" Lightbridge
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    on eq mobile platform. 30mm 10mm 7.5mm Celestron plossls, 26mm 2" Meade qx, 30mm 42mm 2" GSO SV. 8mm 12mm 18mm 25mm Starguider, 1.8x Televue 1.25"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    . 10x50 Tasco binoculars, 15x70 Celestron binoculars. Saxon 909 f10 refractor AZ3

  5. #4
    Don Alvarez's Avatar
    Don Alvarez is offline Bronze Supporter
    Points: 8,871, Level: 65
    Level completed: 41%, Points required for next Level: 179
    Overall activity: 3.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Mar 2017
    Location
    Coral Springs, Florida
    Posts
    1,540
    Points
    8,871
    Level
    65
    Thanks
    168
    Thanked 382x 283 Posts

    Default Re: Questions about my new eyepieces.

    Quote Originally Posted by baward85 View Post
    I just received my order for two new eyepieces to go with my new Orion Xt6 telescope. I got a Meade 4000 32mm FL Super Plossl for deep sky objects and an Orion 9mm FL Expanse eyepiece to replace my 9.7mm plossl(which had terrible eye relief) for moon/planets.

    I don't have my Orion XT6 collimated yet because I'm still waiting for the collimation tool I ordered to come in the mail. So I tested them out using my F/5 Refractor during the daytime.

    The problem I have with 32mm FL plossl is that It has way too much eyerelief. Or atleast without glasses. It's fine with glasses though. I want to have an eyepiece that is good with both eyeglass and non-eyeglass usage. The advertised Eyerelief on Meade's site is 26mm. There was another simliar 32mm Plossl eyepiece by Astro-Tech that has an advertised eye relief of 20mm. I was wondering if It was worth it to return the Meade and get the Astro-Tech instead. Would 6mm ER be much of a difference?
    My own opinion would be not enough to warrant an exchange. Even 20mm is going to have your viewing position perched well above the eyecup, so in the end you will be viewing through each EP in the same fashion, as Spyder says, using a hovering technique. It just takes some practice to get used to.

    The problem with the 9mm FL Orion Expanse is that. When looking through it, I kept seeing a bunch of black boomerang shaped splotches which i believe is what is reffered to as kidney beaning. Would this only be a problem during the day through a fast telescope? Would it be less of a problem through my slower F/8 reflector at night?
    The 9mm Expanse I've noted is another eyepiece that can be finicky about eye position, and will produce off axis distortions in a fast reflector. They do improve as the focal ration gets slower though. I still use them in an F10 refractor, the image is pretty good so I imagine at F8 they should do well also.
    Bigzmey likes this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    :
    10" SkyLine
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , Celestron Nextar GT90, Meade Infinity 80
    EP: The Five Fingers of Doom: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's
    20mm, 26mm, 32mm, 40mm Meade 4000 Plossls, 30mm, 20mm, 15mm GSO Superview,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    Expanse, Baader Classic Orthos, Various others.
    Binocs: 15x70 Celestron Skymaster, 10x50 Levenhuk Karma Pro, 10x42 Bushnell, 8x42 Sans & Streiffe

    Member, South Florida Amateur Astronomers Association

  6. #5
    Shorty Barlow's Avatar
    Shorty Barlow is offline Bronze Supporter
    Points: 24,426, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 69.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Nov 2016
    Location
    Lloegr
    Posts
    2,455
    Points
    24,426
    Level
    100
    Thanks
    133
    Thanked 696x 420 Posts

    Default Re: Questions about my new eyepieces.

    Eye positioning on longer focal length Plossls has always been problematical in my experience. TeleVue even make eyeguard extenders for this reason. One day I realised that one of my most used EP's was a Vixen 30mm NPL. It dawned on me that the eye relief was virtually perfect for me.



    The 25mm is good as well. The 40mm, when the plastic eyecup is twisted up, is the most comfortable 40mm Plossl I've ever used.



    I have the 9mm 'Orion' Expanse. It's undoubtedly the best of the range. It's pretty good on fast refractors once you get used to the eye position.
    AbbN and j.gardavsky like this.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

  7. #6
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 78,567, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 88.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    18,225
    Points
    78,567
    Level
    100
    Thanks
    3,423
    Thanked 5,738x 4,813 Posts
    Blog Entries
    4

    Default Re: Questions about my new eyepieces.

    Just a question but are you sitting or standing when viewing?
    You are much more stable when sitting so it is normally a bit easier to keep your eye centered and steady which helps cut down on the kidneybeaning.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  8. #7
    Bigzmey's Avatar
    Bigzmey is offline HYPER GIANT
    Points: 38,865, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.5%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    3rd Most Active Award
    Join Date
    Sep 2015
    Location
    San Diego, California, USA
    Posts
    7,252
    Points
    38,865
    Level
    100
    Thanks
    1,699
    Thanked 3,025x 2,200 Posts

    Default Re: Questions about my new eyepieces.

    I have a few 32mm Plossls including Meade's. I did not notice that the ER on it is longer than for others. They all have long ER which one just need get used to.

    As for 9mm Expanse, I would suggest to exchange it if you can. Meade 32mm Plossl is a nice performer once you get used to ER, but IMO there is nothing special about Expanse to suffer kidney beaning. There are much better EPs in particular for moon and planets.

    I recommend Celestron X-Cel LX.
    AbbN, j.gardavsky and Gabby76 like this.
    Scopes: Celestron: 8" SCT F10, Omni 150R Achro F5, Onyx 80ED F6.3; ES: 127mm CF F7.5 APO; Meade: ST80 F5. Mounts: ES Twilight I, Bresser EXOS2, SW SkyTee2, AzGTi, UA MicroStar. Binos: Orion 15x70, 10x50, Nikon 8x40. EPs: Pentax: XWs; TeleVue: Delites, Plossls & barlows; ES: 82os & 68os; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Meade: UWAs & Plossls. Filters: Astronomik: UHC; Lumicon: OIII, H-beta, DeepSky; Baader: UHC-S, M&SG, CB; Orion: UltraBlock, SG. DSO tally: 1192 (H400-1: 400, H400-2: 302, H300-3: 87; M110: 110, S110: 73). Doubles: 772, Comets: 11, Asteroids: 59
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  9. #8
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 78,567, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 88.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Join Date
    Jan 2016
    Location
    Live: Slovakia Work: Canada
    Posts
    18,225
    Points
    78,567
    Level
    100
    Thanks
    3,423
    Thanked 5,738x 4,813 Posts
    Blog Entries
    4

    Default Re: Questions about my new eyepieces.

    IMO the 9mm is the "jewel" of the 4 piece set though that is not saying much as I would prefer to throw them into a deep ravine than put my eye to them again
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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

    The weakest link in the optical chain is the large nut located directly behind the
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    / camera. - Gabrielle

    Ya gotta keep this Apo/
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

  10. #9
    not_Fritz_Argelander's Avatar
    not_Fritz_Argelander is online now HYPER GIANT
    Points: 177,590, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    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
    21,650
    Points
    177,590
    Level
    100
    Thanks
    7,221
    Thanked 45,793x 14,733 Posts
    Blog Entries
    59

    Default Re: Questions about my new eyepieces.

    Quote Originally Posted by Gabby76 View Post
    IMO the 9mm is the "jewel" of the 4 piece set though that is not saying much as I would prefer to throw them into a deep ravine than put my eye to them again
    The Expanses make interesting paperweights......
    AbbN and Gabby76 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

  11. #10
    Shorty Barlow's Avatar
    Shorty Barlow is offline Bronze Supporter
    Points: 24,426, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 69.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Nov 2016
    Location
    Lloegr
    Posts
    2,455
    Points
    24,426
    Level
    100
    Thanks
    133
    Thanked 696x 420 Posts

    Default Re: Questions about my new eyepieces.

    Quote Originally Posted by Gabby76 View Post
    IMO the 9mm is the "jewel" of the 4 piece set though that is not saying much as I would prefer to throw them into a deep ravine than put my eye to them again
    I'm keeping the 9mm, but the 15mm is already in the deep ravine! lol
    AbbN and Gabby76 like this.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

 

 
Page 1 of 4 123 ... LastLast

Similar Threads

  1. Some questions regarding eyepieces, please...
    By jcohenmd in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 10-21-2014, 02:16 AM
  2. A few questions regarding eyepieces for my scope
    By jelamb in forum Astronomy Beginners Forum
    Replies: 23
    Last Post: 10-18-2014, 03:46 AM
  3. questions about eyepieces
    By brucesherman in forum Astronomy Beginners Forum
    Replies: 11
    Last Post: 12-17-2013, 08:28 PM
  4. Two questions about eyepieces:
    By danram90 in forum Astronomy Beginners Forum
    Replies: 5
    Last Post: 02-09-2013, 09:17 PM
  5. Two unrelated questions about eyepieces.
    By rapidsequence in forum Astronomy Beginners Forum
    Replies: 11
    Last Post: 05-02-2012, 07:30 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 04:34 AM.