Page 1 of 4 123 ... LastLast
Results 1 to 10 of 38
Like Tree47Likes

Thread: EP range question, only 3 EP's

  1. #1
    icampy's Avatar
    icampy is offline Star Giants
    Points: 1,952, Level: 27
    Level completed: 52%, Points required for next Level: 48
    Overall activity: 2.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Dec 2017
    Location
    Out West
    Posts
    173
    Points
    1,952
    Level
    27
    Thanks
    34
    Thanked 13x 11 Posts

    Default EP range question, only 3 EP's



    Hi all.
    I have a celestron 130, it's a F/5, 650 focal length newtonian.

    I have decided to go ahead buy 3 EP's, in the $60 to $150 range within a month or two. I am thinking 1 ES 82 of whatever length is best for me, and then the other 2 either ES 62 or Xcel-LX or Meade 5000 EPs. I have a cheap svbony 2x barlow that I can use with them (but will upgrade later on if I need to).

    I was thinking if I sprung for the ES 82 in the lowest length, 4.7mm, it would serve me better than one in the 8-10mm length with the cheap barlow. Does that make sense? I am judging by how my cheap 25 looks great to me, and the 9 looks not so great. Would something like the following work for me? I would like to split my time between solar system and DSO's both.

    If LP has any relevance, keep in my I have very, very dark skies.


    Here is my thinking:

    ES 82 4.7mm
    Xcel-LX OR Meade 5000 9mm (Will this and a barlow perform close enough to the standalone 4.7, with the 4.7 being a "higher quality" lens?)
    Either the celestron or meade in a 25 mm range

    I could also do a lower-length in the celestron or xcel, with a ES 82 in 8.8mm length.

    So many options, I could use some guidance. My thinking is that in the "more difficult to use", shorter lengths, I would be better off having a nicer EP versus using a barlow with a cheaper, longer EP.

    Or I could just get all 3 in the ES 62 degree line.


    If I will spend the 150 on 1 EP, and 60 to 80 on the other two what should it be?

    Thanks!!
    Last edited by icampy; 01-05-2018 at 02:44 PM.
    Proud American
    130/650 newt with tube rings/long rail/orion motor focuser
    127/1900 mak
    KK orthos

  2. The Following User Says Thank You to icampy For This Useful Post:

    helicon64 (01-05-2018)

  3. #2
    jerryTheC's Avatar
    jerryTheC is offline Super Moderator
    Points: 26,893, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 10.0%
    Achievements:
    365 Days+ Registered Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!First 1000 Experience Points
    Join Date
    Apr 2011
    Location
    Harrow, UK
    Posts
    6,029
    Points
    26,893
    Level
    100
    Thanks
    335
    Thanked 1,915x 1,623 Posts

    Default Re: EP range question, only 3 EP's

    I'd suggest looking for stuff that will give you the following exit pupils:

    1mm = focal length around f-ratio of scope (5mm for an f5 scope). This will give you around the highest "everyday" magnification (= aperture of scope in mm, or 130 x for yours)

    2mm = focal length around twice the f-ratio (10mm for f5, 65x). This gives you enough magnification that you should be able to see the detail your scope can produce - at lower magnifications (bigger exit pupils) the magnification may not be high enough to see all the details.

    5mm = focal length around five times the f-ratio (25mm for f5). This gives you the brightest and lowest magnification image, handy for finding things. (If you're young enough that your eyes can dilate more, and you're away from light pollution, you could maybe go to around 7mm. Go too large, though, and you start wasting light (it won't fit in through your eye's pupil, and you may start seeing the shadow of the secondary mirror) (With a refractor, you still waste some light but don't have the shadow problem - so can sometimes be useful if you want a wider view)).

    Given good seeing conditions (steady air), you may be able to push to double the max magnification (0.5mm exit pupil), which is what the manufacturers usually quote as the max - but suitable conditions can be rare.
    <i><span style="font-family: Times New Roman"><font size="2"><b>SCT:</b> N11GPS <b>Refractors:</b> FS-60C/CSV, ZD-66, A80SS, FSQ106ED <b>Binoculars:</b> 8x42, 15x70<br /><b>Eyepieces:</b> 40mm Meade SWA, 28mm UWAN, 17mmT4, 12mmT4, 2.5mmT6 Nagler, 17mm, 8mm, 5mm LVW, HI-LE2.8<br /> <a href="
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    target="_blank"><i><font size="2"><span style="font-family: times new roman">Astronomy Forum Rules &amp; Terms of Service</span></font></i></a>

  4. The Following 2 Users Say Thank You to jerryTheC For This Useful Post:

    helicon64 (01-05-2018),icampy (01-05-2018)

  5. #3
    KathyNS's Avatar
    KathyNS is online now Super Moderator
    Points: 172,084, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 6.0%
    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
    25,106
    Points
    172,084
    Level
    100
    Thanks
    6,655
    Thanked 14,961x 9,524 Posts
    Blog Entries
    3

    Default Re: EP range question, only 3 EP's

    The 4.7mm is a good choice for high magnification. The nice thing about an eyepiece in this range (1mm exit pupil) is that, if conditions are excellent, you can barlow it and still have a useable ideal-conditions magnification.

    At the far end, anything up to 30-35mm will give good wide-angle views. I find the 68-70 degree field of view to be comfortable, but if you like wider views, this would be the eyepiece to splurge on a wide field of view.

    You would wand a middle-range eyepiece somewhere in between the extremes. Maybe something around 12mm.

    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.

  6. The Following 2 Users Say Thank You to KathyNS For This Useful Post:

    helicon64 (01-05-2018),icampy (01-05-2018)

  7. #4
    icampy's Avatar
    icampy is offline Star Giants
    Points: 1,952, Level: 27
    Level completed: 52%, Points required for next Level: 48
    Overall activity: 2.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Dec 2017
    Location
    Out West
    Posts
    173
    Points
    1,952
    Level
    27
    Thanks
    34
    Thanked 13x 11 Posts

    Default Re: EP range question, only 3 EP's

    Thanks, ya'll!

    So in the lowest length, I am between these (cheapest ones half the price of the most expensive ones):

    Stellarvue 4.9 planetary
    Stellarvue 4 82
    Baader planetarium hyperion 5
    Explore Sci 4.7 82
    Celestron Xcel lx 5
    Meade 5000 4.5
    Meade 5000 xtreme wide angle 5.5
    and Orion 3mm edge-on

    I am not concerned about a wide FOV, until I think that I might not fit the "whole" DSO in my FOV with these low power ones?
    Proud American
    130/650 newt with tube rings/long rail/orion motor focuser
    127/1900 mak
    KK orthos

  8. #5
    icampy's Avatar
    icampy is offline Star Giants
    Points: 1,952, Level: 27
    Level completed: 52%, Points required for next Level: 48
    Overall activity: 2.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Dec 2017
    Location
    Out West
    Posts
    173
    Points
    1,952
    Level
    27
    Thanks
    34
    Thanked 13x 11 Posts

    Default Re: EP range question, only 3 EP's

    Also, if the EP will outclass the scope, then I can go with a sub $80 EP vs the higher-end ones. But if buying the nicer EP's help me see more, I will spend the money.
    Proud American
    130/650 newt with tube rings/long rail/orion motor focuser
    127/1900 mak
    KK orthos

  9. #6
    SpyderwerX's Avatar
    SpyderwerX is offline Neutron Sequence
    Points: 23,621, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 6.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Jan 2015
    Location
    upstate SC
    Posts
    4,524
    Points
    23,621
    Level
    100
    Thanks
    1,962
    Thanked 1,262x 1,004 Posts

    Default Re: EP range question, only 3 EP's

    Quote Originally Posted by icampy View Post
    Also, if the EP will outclass the scope, then I can go with a sub $80 EP vs the higher-end ones. But if buying the nicer EP's help me see more, I will spend the money.
    The way I look at EP's is that they are a lifetime investment. Scopes may change or come and go, but the EP's can migrate right along for the ride no matter how many times you upgrade the scope. Research and study and save and buy what you feel you will need in the long run. In the end it ends up cheaper (and usually less frustrating) than upgrading time and time again.
    ~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...
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    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..

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

    icampy (01-05-2018)

  11. #7
    icampy's Avatar
    icampy is offline Star Giants
    Points: 1,952, Level: 27
    Level completed: 52%, Points required for next Level: 48
    Overall activity: 2.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Dec 2017
    Location
    Out West
    Posts
    173
    Points
    1,952
    Level
    27
    Thanks
    34
    Thanked 13x 11 Posts

    Default Re: EP range question, only 3 EP's

    Thanks bud. There is a dizzying amount of EP's out there, so I'm asking questions and reading review after review.
    Proud American
    130/650 newt with tube rings/long rail/orion motor focuser
    127/1900 mak
    KK orthos

  12. #8
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 110,255, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.7%
    Achievements:
    Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!400+ Posts AchievementFirst 1000 Experience Points365 Days+ Registered Achievement!
    Awards:
    3rd Most Active Award
    Join Date
    Feb 2011
    Location
    Germany
    Posts
    14,340
    Points
    110,255
    Level
    100
    Thanks
    14,335
    Thanked 8,740x 5,688 Posts

    Default Re: EP range question, only 3 EP's

    Hello Icampy,

    you have been already given great recommendations above.
    The 1-2-5 (or 1-2-4) choice of the eyepieces according to the exit pupil is the standard when getting started.

    With any budget the right way is to get the best quality eyepieces you can find and pay.
    Otherwise people are rolling over the EPs arsenal, the way which finally costs more.

    For a small aperture telescope I would take eyepieces with a minimum of glass inside to avoid the transmissivity and contrast loss.
    So, these are basically the Abbe orthos and Plössls,
    leaving the Kellners (Claus Kellner of Zeiss) in the socks drawer for just the few lowest surface brightness objects.
    These EPs offer smaller fields of view, and at the short f also a shorter eye relief,
    but the good news reads: they are also necessary with whatever larger scope you may have later,
    when you will be pulling the best out of the scope aperture on the difficult objects in the night skies.

    Take you time to save money for the Tele Vue Delos and Pentax XW.

    Best,

    JG
    DeanD, SpyderwerX and John Baars like this.
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    : AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
    Astronomy Forum Rules and Terms of Service
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

  13. #9
    helicon64's Avatar
    helicon64 is offline Indy the cat
    Points: 134,465, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!Ghost Achievement! Averaging 5+ posts a day!200+ Posts Achievement!
    Awards:
    Most Friends Award!
    Join Date
    Jul 2012
    Location
    Berkeley, CA
    Posts
    22,663
    Points
    134,465
    Level
    100
    Thanks
    23,733
    Thanked 6,969x 5,426 Posts

    Default Re: EP range question, only 3 EP's

    I heartily recommend the ES 18 mm 82 degree eyepiece - my most used eyepiece.
    Michael
    Obsession 18" f/4.2, Zhumell Z10 f/4.9, ES AR 152 refractor f/6.5, Celestron Skymaster 15x70's , Bushnell 10x50's
    9x50mm RACI finder, Telrad, Rigel Quickfinder, 30mm Erfle, 9mm Plossl, and full line of ES eyepieces
    Imagination is more important than knowledge. Knowledge is Limited. Imagination Circles the World... A. Einstein


  14. The Following User Says Thank You to helicon64 For This Useful Post:

    icampy (01-06-2018)

  15. #10
    icampy's Avatar
    icampy is offline Star Giants
    Points: 1,952, Level: 27
    Level completed: 52%, Points required for next Level: 48
    Overall activity: 2.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Dec 2017
    Location
    Out West
    Posts
    173
    Points
    1,952
    Level
    27
    Thanks
    34
    Thanked 13x 11 Posts

    Default Re: EP range question, only 3 EP's

    Thanks, ya'll. I will keep researching. I do know that I won't be spending the price of the scope on EP's right now...especially since I've had a scope for all of 2 weeks, but we will see.

    I have steiners on a couple of rifles, so I'm not afraid of high-end stuff, but I want to get a little experience before I start dropping multiple hundreds on EP's for a $300 scope I just got.
    Proud American
    130/650 newt with tube rings/long rail/orion motor focuser
    127/1900 mak
    KK orthos

 

 
Page 1 of 4 123 ... LastLast

Similar Threads

  1. Why no mid range BHs
    By not_Fritz_Argelander in forum Astrophysics Forum
    Replies: 0
    Last Post: 06-28-2017, 02:04 AM
  2. Help me find a camera with good dynamic range - if that is the right question
    By CamelHat in forum Astronomy Digital Cameras Forum
    Replies: 23
    Last Post: 06-22-2014, 05:11 PM
  3. Sub $750 range CCD
    By pluto7777 in forum CCD Imaging Forum
    Replies: 2
    Last Post: 05-21-2012, 12:54 PM
  4. $300 range of mid 20s mm eps for C11
    By polyphemus in forum Telescope Eyepieces Forum
    Replies: 0
    Last Post: 05-13-2011, 04:56 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 07:08 PM.