Page 1 of 2 12 LastLast
Results 1 to 10 of 16
Like Tree12Likes

Thread: Fast Newtonian eyepiece query

  1. #1
    Frosty-vegi's Avatar
    Frosty-vegi is offline White Dwarf
    Points: 1,622, Level: 24
    Level completed: 22%, Points required for next Level: 78
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Oct 2014
    Location
    Brisbane, QLD
    Posts
    7
    Points
    1,622
    Level
    24
    Thanks
    0
    Thanked 2x 2 Posts

    Question Fast Newtonian eyepiece query



    Hi guys,

    I've been asking elsewhere but have hit a brick wall with needing further, refined suggestions for those that know more than myself.

    Current gear includes:
    • Skywatcher Carbon Fibre Newtonian 10 inch (1000mm focal, F/4, 2 inch focuser)
    • Skywatcher HEQ5 mount
    • Imaging with a Canon 450D


    I have previously been using my sisters 1.25 inch eyepieces, which were, from memory, a couple of modified achromat (I think a 25mm and 10mm) and I think one Plössl which I think was around a 6mm. These were probably 15-20 years old (judging on the age of her 12 inch Dob). She also had a 2 inch barlow. I had good experience with using these very basic eyepieces, but now need to invest in my own as well as probably get some better quality ones to go along with my scope investment.

    I’m interesting in both viewing and imaging all sorts of targets from the celestials to DSO’s, really need to try and cover off all bases, but I’m not experienced or particular enough to need a perfectly even, flat, coma and aberration free images (at this early stage).

    Suggestions provided to me previously were to consider either the Vixen LVW's or anything from Tele Vue, mainly the more wide field pieces. From a lot of research, I have kinda settled on the TV's as everything suggests they are rarely beaten (without going over the top with price) with regards to scopes up to F/4 due to their testing of eyepieces up to these speeds. That being said, I'm trying to be realistic with the price factor and at this stage am aiming towards a low, mid and high power piece and a Barlow. Because of the price factor, I'm limiting myself to the DeLites for the mid and high power, however am stuck when looking at the low power piece.

    So I'm considering the 5mm and 15 or 18.2mm DeLites, but then for the low power the options I see are:
    • TV Plossl and live with the lower FOV (happy to do) for a lower price
    • Vixen LVW 30mm for around the same cost as the DeLites
    • TV Panoptic 24mm (struggling to push this into the low power category) for approximately $60AUD more than the LVW


    Then, judging on the above range, is what Barlow to get.. probably aiming towards the 1.25" in either 2x or 2.5x PowerMate if it gives me more flexibility with the above eyepieces.

    All of this has to be taken into consideration that I do have a 2 inch focuser and feel slightly like I'm 'letting the team down' going for predominately 1.25" eyepieces.

    Appreciate the thoughts people!
    j.gardavsky, MoosBros and jockkath like this.

  2. #2
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 83,963, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.8%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,481
    Points
    83,963
    Level
    100
    Thanks
    3,708
    Thanked 6,023x 5,060 Posts
    Blog Entries
    4

    Default Re: Fast Newtonian eyepiece query

    Hello and welcome to the forums Frosty.
    I hope you have not spent all the money on the TVs yet. I would highly recommend you make an attempt at getting to a star party beforehand and get a chance to view though different scopes and eyepieces.
    DeanD likes this.
    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"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    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)

  3. #3
    DeanD's Avatar
    DeanD is offline HYPER GIANT
    Points: 16,589, Level: 88
    Level completed: 97%, Points required for next Level: 11
    Overall activity: 31.0%
    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
    2,375
    Points
    16,589
    Level
    88
    Thanks
    280
    Thanked 734x 598 Posts

    Default Re: Fast Newtonian eyepiece query

    Hi Frosty and welcome!

    With an f4 scope you will find some coma particularly if you move to wide-field eyepieces. The Panoptic 24 that you mention is a lovely eyepiece, but it will show coma without a coma corrector. I think you will find that the Televue 32mm plossl will do a very good job without a coma corrector (I have used both of these on an f4 scope), and it won't break the Bank! This eyepiece will give you the maximum possible true FOV for a 32mm eyepiece- and it is one of my "go-to's".

    Down the track if you feel you need a coma corrector, GSO do one which is around $149 at Andrews (Browse All Types of Optical Telescopes and Telescopes Accessories at Australia's #1 Store) - but I would hold off until you know exactly what you want. The Televue Paracorr is the Rolls Royce, but very expensive...

    There are often second-hand eyepieces for sale in Australia on IceinSpace: e.g. if you are quick right now there are some Vixen LVW's (including the 22mm)([FOR SALE] Vixen 13mm and 22mm LVW (with boxes) - IceInSpace ), and a 7mm Delite. See Eyepieces - IceInSpace for a range of deals!

    Claude might have a 32mm Televue Plossl as well, his price looks pretty good: http://www.astronomy-electronics-cen...ices_other.htm

    Unfortunately Bintel's Televue sale ended on Monday I think.

    I agree with Gabby that it is always a good idea to check out your local Astronomical Society, and try different options. People are usually very happy to let you play with their equipment! (I was at a members' night on Saturday, and got to play with the whole Ethos range, as well as a couple of the big Naglers!)

    All the best,

    Dean
    Last edited by DeanD; 11-30-2016 at 06:02 AM.
    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

  4. #4
    MistrBadgr's Avatar
    MistrBadgr is offline Bronze Supporter
    Points: 9,185, Level: 66
    Level completed: 45%, Points required for next Level: 165
    Overall activity: 3.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Aug 2016
    Location
    Broken Arrow, Oklahoma
    Posts
    1,865
    Points
    9,185
    Level
    66
    Thanks
    236
    Thanked 520x 450 Posts

    Default Re: Fast Newtonian eyepiece query

    One thing to consider when purchasing your longest focal length scope is the pupil size. If it is too big, then all the light of the image will not fit through the pupil in your eye. The image will be darker, or the light level may be uneven, or things can black out on you if you move your eye at all. A quick way to calculate this, the way the numbers work out is to divide the focal length of the eyepiece by the focal ratio of your scope. Even though some people's pupils can open past 7mm under really dark conditions, I think it is better to limit that number to 6mm. Since I am older and my pupils do not open as wide as they used to, I limit mine to 5mm. With this in mind, a pupil size of 6mm with your scope would limit the focal length of the eyepiece to 24mm.

    I am not sure about others, but I am remembering the Televue coma corrector also has a 1.15 multiplying factor in it to keep the focal point out where you can get at it. This increases the focal length of the scope that much, just like a Barlow, which would allow for a longer focal length eyepiece by the same amount.

    For that longest focal length eyepiece, I use several different ones, depending on the scope. The two I have that could be the most effective for you is an ES 68 deg 24mm and a Meade 5000 82 deg 24mm. Both are excellent eyepieces. The Explore Scientific 82 deg series are excellent eyepieces from all that I hear. I am perfectly satisfied with the Meade 82 degree eyepieces that I have as well. In truth, you will not go too far wrong with eyepieces from any of the major brands and many of lesser known ones, for whatever focal length you might want. However, each different eyepiece has its positives and negatives as well as each series as a whole. There are a lot of different theories and tactics about how to select which eyepieces to use.

    A lot of what will be best for your situation, I think, depends on the characteristics of your eyes, your particular scope, and the conditions under which you do your astronomy. As others have mentioned, the best way to get solid information is to take your scope to an astronomy club star party and look through a number of eyepieces. A lot depends on the individual, but many astronomers will let you try their eyepieces in your scope, if you ask politely.
    DeanD and bladekeeper like this.
    Bill Steen
    Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma
    Meade LX 70 8R & 6M, Infinity 60, 80 & 102,
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    112, 127, & 130, DS 2102 OTA, DS 90 OTA, 60 mm f/15, Lightbridge 12, Lightbridge Mini 82, Eclipseview 76 & 114, Sky Shed 3 Bay POD, LPI-G Color

  5. #5
    Frosty-vegi's Avatar
    Frosty-vegi is offline White Dwarf
    Points: 1,622, Level: 24
    Level completed: 22%, Points required for next Level: 78
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Oct 2014
    Location
    Brisbane, QLD
    Posts
    7
    Points
    1,622
    Level
    24
    Thanks
    0
    Thanked 2x 2 Posts

    Default Re: Fast Newtonian eyepiece query

    Hi guys, thanks for the response.

    I am definitely going to be trying some options before buying, although I was hoping to get at least one piece and a Barlow before Christmas.. as mentioned, I'm just planning my purchases for the next 6 months, but really wanted people's thoughts on the spread of eyepiece focal length options so I get a good combination of eyepieces over low-mid-high power, if I do decide on the DeLites for the mid and high power options.

  6. #6
    jerryTheC's Avatar
    jerryTheC is offline Super Moderator
    Points: 26,972, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 11.0%
    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
    6,031
    Points
    26,972
    Level
    100
    Thanks
    335
    Thanked 1,915x 1,623 Posts

    Default Re: Fast Newtonian eyepiece query

    If you're looking for low power eyepieces, then it's definitely worth looking at the 2" ones - the bigger barrel allows for a much bigger true field of view than you can fit inside the smaller 1.25" barrel designs.
    <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>

  7. #7
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 83,963, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.8%
    Achievements:
    2 Posts Achievement20 Posts Achievement!Gallery Achievement!Album Achievement!50 Posts Achievement!
    Awards:
    Activity & Post & Thread Master
    Join Date
    Jan 2016
    Location
    Slovakia
    Posts
    19,481
    Points
    83,963
    Level
    100
    Thanks
    3,708
    Thanked 6,023x 5,060 Posts
    Blog Entries
    4

    Default Re: Fast Newtonian eyepiece query

    Hello Frosty is there any particular reason for a carbon fibre tube or just the f/4 compared to the f/4.7 of the aluminium?
    Also I was looking at the photographic weight rating of the HEQ5 and either scope is closer to the visual capacity of the mount before you even start placing accessories on it.
    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"
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    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. #8
    Frosty-vegi's Avatar
    Frosty-vegi is offline White Dwarf
    Points: 1,622, Level: 24
    Level completed: 22%, Points required for next Level: 78
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Oct 2014
    Location
    Brisbane, QLD
    Posts
    7
    Points
    1,622
    Level
    24
    Thanks
    0
    Thanked 2x 2 Posts

    Default Re: Fast Newtonian eyepiece query

    Quote Originally Posted by jerryTheC View Post
    If you're looking for low power eyepieces, then it's definitely worth looking at the 2" ones
    Any suggestions on reasonably costed 2" wide field eyepieces then? Sticking with those that work well with fast scopes, it still has me throwing up between the LVW 30" or Panoptic 24" (or push to the 27+ for more $).


    Quote Originally Posted by Gabby76 View Post
    Hello Frosty is there any particular reason for a carbon fibre tube.
    I got it for a good price compared to the other options I had available at the time. I've used it a fair bit for both basic visual viewing with my sisters old eyepieces and with my DLSR, happy with it's balance with what I've used so far. Of course, the mount may start to struggle if/when I go the extra step to guiding, but that is still a while away I feel, very happy to stick with where I'm at with current level of astrophotography. I just really need eyepieces to get some visual use out of the gear, as well as give some friends and family members a go at it.
    Gabby76 likes this.

  9. #9
    MoosBros's Avatar
    MoosBros is offline HYPER GIANT
    Points: 15,876, Level: 86
    Level completed: 94%, Points required for next Level: 24
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Dec 2013
    Location
    South Carolina
    Posts
    2,990
    Points
    15,876
    Level
    86
    Thanks
    408
    Thanked 464x 426 Posts

    Default Re: Fast Newtonian eyepiece query

    Quote Originally Posted by Frosty-vegi View Post
    Hi guys,


    All of this has to be taken into consideration that I do have a 2 inch focuser and feel slightly like I'm 'letting the team down' going for predominately 1.25" eyepieces.

    Appreciate the thoughts people!
    Not at all "letting the team down" by having a good stable of 1.25" EP's for your scope. You're saving a ton of money.

    2" EP's aren't required for most shorter F/L ep's. A longer F/L widefield probably has to be a 2". 2" ep's COST much more. This advice is coming from someone who went the all 2" 100 degree route and paid dearly for the lesson.

    A COMA corrector is going to be one of your most expensive purchases in the near future. @ f/4 there is no way to avoid that....

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    6-7 Bob--aka--<> urban guerrilla star gazer <> YURT Urban Mobile Observatory
    Zhumell Tachyon 25x100, Celestron Comet Hunter 11x80, Zhumell z12 f/4.92 w/HALO--StellarVue F80M2 80mm f/4--Vixen R130Sf
    Zhumell 2" 2x ED
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    , TeleVue 2x Big Barlow
    Explore Scientific 100* Series-----5.5mm, 9mm, 14mm, 20mm, ES 82* Series-----30mm
    Thousand Oaks 2" O-III , DGM 2" NPB

  10. #10
    Frosty-vegi's Avatar
    Frosty-vegi is offline White Dwarf
    Points: 1,622, Level: 24
    Level completed: 22%, Points required for next Level: 78
    Overall activity: 0%
    Achievements:
    First 1000 Experience Points365 Days+ Registered Achievement!750 Days+ Registered Achievement!1000 Days+ Registered Achievement!3 Years + Achievement
    Join Date
    Oct 2014
    Location
    Brisbane, QLD
    Posts
    7
    Points
    1,622
    Level
    24
    Thanks
    0
    Thanked 2x 2 Posts

    Default Re: Fast Newtonian eyepiece query

    Quote Originally Posted by MoosBros View Post
    A COMA corrector is going to be one of your most expensive purchases in the near future. @ f/4 there is no way to avoid that....
    Yes, I'm already sizing my options up for this for the future. Really depends how noticeable it is with the first few eyepieces I get. When I was using my sisters EP's, it wasn't really noticeable, but they were all very limited with their FOV. Could see it on my astrophotography shots, but once again, knew it was just a 'feature' of my scope that I can live with for the time.

    Still trying to remember if I was warned how expensive a fast scope would be when I was first considering the F/4... the wonders of hindsight!
    MoosBros likes this.

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. GSO 2" Coma Corrector for fast Newtonian Telescope
    By WConde in forum Astronomy Forum
    Replies: 1
    Last Post: 10-26-2015, 07:45 PM
  2. Eyepiece locating query on 6SE and focussing accuracy
    By Mystery57 in forum Astronomy Beginners Forum
    Replies: 6
    Last Post: 01-23-2014, 07:27 AM
  3. Fast Focus Short Tube Newtonian Telescopes
    By philip d in forum Reflector Telescope Forum
    Replies: 14
    Last Post: 04-27-2012, 06:24 PM
  4. Planetary imaging with fast Newtonian
    By Max in forum Amateur Astronomy Forum
    Replies: 20
    Last Post: 10-20-2005, 02:37 AM
  5. Which eyepieces for a fast newtonian?
    By Chris Jewell in forum Amateur Astronomy Forum
    Replies: 9
    Last Post: 02-19-2004, 12:51 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 08:57 PM.