Page 1 of 2 12 LastLast
Results 1 to 10 of 11
Like Tree28Likes

Thread: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

  1. #1
    spelunkerd's Avatar
    spelunkerd is offline SUPER GIANT
    Points: 6,633, Level: 56
    Level completed: 42%, Points required for next Level: 117
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Aug 2014
    Location
    Victoria, Canada
    Posts
    945
    Points
    6,633
    Level
    56
    Thanks
    109
    Thanked 321x 223 Posts

    Default ES 82 deg 18mm vs TV 50 deg 15mm Plossl



    One of my favourite eyepieces has been the ES 2" 82 deg 18mm, which is the eyepiece that definitively swung me over to being a wide field believer. What an astonishing difference it makes to viewing, and also for target finding, not to mention the compelling feeling of immersion. Recently I needed a 1.25" eyepiece to fit a solar scope, so I picked up a TV 15mm plossl, with the thought that wide field was not particularly helpful for solar viewing. This week I've been comparing night views with the 50 deg narrow field plossl to the 18. Sure, it's not a fair comparison! 3mm difference in magnification is significant, and the plossl avoids distortion of edges by simply not showing those edges.

    I expected a little improvement because of the higher magnification (101X vs 84X), but the result was far better than I had expected. So often I get similar views when comparing equipment, I didn't think I'd see much difference. To my surprise, the cheaper plossl clearly beats the ES 18 for contrast throughout the field, and central resolution was dramatically better.

    Ultimately I suppose I shouldn't be surprised, different tools will excel depending on the test subject and the circumstance. Perhaps the wider field drew in a little more extraneous light pollution. I'm still in love with 82 deg, and it's hard to beat the way wide field eyepieces make starhopping so much easier. However once targets are found, it looks like I'll be moving back to those narrow field, old fashioned little plossls for a better look, after all.
    Dave
    Dobsonian Apertura AD12, TV N5 Nagler 31mm, ES 82deg 18mm, TV plossl 15mm, 11mm, 8mm, TV Delos 8mm, UO HD Abbe Orthoscopic II 6mm, Telrad.
    Cat's Eye cheshire and sight tube. Orion 2" narrowband ultrablock. Swarovski 20-60X HD spotting scope, Swarovski 8.5X42 binoculars.
    Astra IIIb metal sextant. Lunt LS50 THa B600 solar telescope

    Living on an island, with plenty of time to watch the planet turn.

  2. #2
    bladekeeper's Avatar
    bladekeeper is offline Super Moderator
    Points: 303,531, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 100.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Awards:
    Activity Award
    Join Date
    Aug 2014
    Location
    Lowell, Arkansas, USA
    Posts
    38,871
    Points
    303,531
    Level
    100
    Thanks
    29,120
    Thanked 17,665x 12,097 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    Nice! Less glass between you and the target yields better contrast. Hard to be a Plossl for a clean crisp view!
    j.gardavsky and stargazer769 like this.
    Bryan

    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.
    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    MC90 f/13.3;
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
    Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.

    Eyepieces: GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
    Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    12×60 LW, Gordon 10×50, Apogee 20×100

    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.

    Galaxy Hunter's Creed - When you play whack-a-mole, sometimes you hit 'em on the head, sometimes you miss 'em. But its always fun to play, and if you don't play, you ain't gettin no moles! - KT4HX

  3. #3
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 82,971, 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
    19,247
    Points
    82,971
    Level
    100
    Thanks
    3,693
    Thanked 5,994x 5,036 Posts
    Blog Entries
    4

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    Actually your statement does not surprise me at all as a Plossl is well corrected down to f/4, one of the reasons I always recommend good Orthos and Plossls for pulling out details and structure.
    Loss of contrast is inherent in the design of widefield eyeieces there is always a trade off when correcting to the edge of field for the wider field of view.
    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)

  4. #4
    Davesellars's Avatar
    Davesellars is offline HYPER GIANT
    Points: 27,721, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Sep 2014
    Location
    Belper
    Posts
    4,701
    Points
    27,721
    Level
    100
    Thanks
    911
    Thanked 1,570x 1,197 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    The TV 15mm Plossl is truly an excellent EP. Sharp across the entire field and pulled out fuzzies with ease. I only sold mine because of purchasing the TV 14mm Delos. The additional contrast you would have seen (compared to the 18mm may have much to do with the difference in focal length however the TV does indeed have very good contrast!
    Gabby76 likes this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    etc:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    12" Dob; Skywatcher 80ED & 120ST; EQ5; Grab and Go Alt/Az; 60mm RACI & Rigel Quickfinder.
    Eyepieces: Tele Vue Panoptic 24mm, Delos 10/14/17.3mm; Pentax XW 5/7mm; ES Maxvision 28mm; Baader Classic 10/32mm
    Filters: Astronomik UHC and OIII; Baader OIII; ES H-Beta
    Herschel 400 (H1) Count: 162

  5. #5
    Johnny J.'s Avatar
    Johnny J. is offline SUPER GIANT
    Points: 17,579, Level: 91
    Level completed: 70%, Points required for next Level: 121
    Overall activity: 26.0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!First 1000 Experience Points
    Join Date
    May 2015
    Location
    South Dakota
    Posts
    979
    Points
    17,579
    Level
    91
    Thanks
    278
    Thanked 408x 334 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    The TV EP's have a very high degree of polish as compared to other brands thus reducing "scatter". This is revealed as a perceived improvement in contrast. This holds true across the entire line of TV EP's. Well worth the money IMO. One of my favorite planetary EP's is the 8mm Ethos. In a Dob one can focus it on one side of the field, and let it drift across the field with gobbs of time to concentrate on those brief moments of good seeing. Wide field EP's do have a place for planetary viewing.

    JJ
    Telescopes: Assorted brands and designs from 60mm up to 203mm (9). Eyepieces: Two 6mm BO's (Brown Organics - Eye Balls). Mounts: Celestron, Meade, Orion, Vixen, Skywatcher. Cameras: Canons, Logitech, Orion, QHYs.

  6. #6
    spelunkerd's Avatar
    spelunkerd is offline SUPER GIANT
    Points: 6,633, Level: 56
    Level completed: 42%, Points required for next Level: 117
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!50 Posts Achievement!5 Threads Achievement!200+ Posts Achievement!
    Join Date
    Aug 2014
    Location
    Victoria, Canada
    Posts
    945
    Points
    6,633
    Level
    56
    Thanks
    109
    Thanked 321x 223 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    Quote Originally Posted by Gabby76 View Post
    Actually your statement does not surprise me at all as a Plossl is well corrected down to f/4, one of the reasons I always recommend good Orthos and Plossls for pulling out details and structure.
    Loss of contrast is inherent in the design of widefield eyepieces there is always a trade off when correcting to the edge of field for the wider field of view.
    That is well put, I agree. Ironically, when wanting to hone down on fine detail, the viewer is well served by reaching for much less expensive glass.

    In many situations we humans are swept along with the most recent trends, be they fashion, cars, medical options, and even telescope eyepieces. The trendy push over the past generation has been for increasingly expensive and complex wide field lenses, and it's confusing and unpopular to point out benefits of old technology. That kind of discussion is discouraged by manufacturers who want to ride the wave of fresh research and avoid the competition of expiring patents. You'll never see advertisements for better views with old cheap plossls, even though the manufacturers still quietly make them.

    One way to buy eyepieces is to pick a favourite line, usually defined by AFOV, and get the whole set made by one manufacturer. Although I can see rationale for that, clearly there is benefit to having a wide range of designs. Interestingly, having a clutch of different designs makes the whole experience richer when one compares perspective views from one tool to the next.
    Dave
    Dobsonian Apertura AD12, TV N5 Nagler 31mm, ES 82deg 18mm, TV plossl 15mm, 11mm, 8mm, TV Delos 8mm, UO HD Abbe Orthoscopic II 6mm, Telrad.
    Cat's Eye cheshire and sight tube. Orion 2" narrowband ultrablock. Swarovski 20-60X HD spotting scope, Swarovski 8.5X42 binoculars.
    Astra IIIb metal sextant. Lunt LS50 THa B600 solar telescope

    Living on an island, with plenty of time to watch the planet turn.

  7. #7
    dboeren's Avatar
    dboeren is offline Main Sequence
    Points: 736, Level: 14
    Level completed: 72%, Points required for next Level: 14
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Sep 2016
    Location
    Marietta, GA
    Posts
    145
    Points
    736
    Level
    14
    Thanks
    0
    Thanked 24x 15 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    So theoretically would an ortho be an improvement over a plossl in sharpness and contrast assuming a similar quality and similar focal length?
    Scopes: Orion xx12i Intelliscope dobsonian, Orion SpaceProbe 130EQ w/motor drive
    Eyepieces: 6/10/14mm Televue Delos, 8mm Televue Plossl, 10mm Sirius Plossl, 35mm Orion Deepview
    Misc: 2x Celestron Barlow, 13% Moon Filter

  8. #8
    Gabby76's Avatar
    Gabby76 is offline Super Moderator
    Points: 82,971, 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
    19,247
    Points
    82,971
    Level
    100
    Thanks
    3,693
    Thanked 5,994x 5,036 Posts
    Blog Entries
    4

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    Good Orthos are made to a higher quality than a Plossl and I find they work better.
    An Ortho is designed to show you fine detail and can usually dig a bit deeper when going for the really faint objects. Here is a good example, scroll to the bottom of the page.
    Observing Tips
    spelunkerd and stargazer769 like 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)

  9. #9
    j.gardavsky's Avatar
    j.gardavsky is offline Super Moderator
    Points: 110,910, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 99.6%
    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
    14,398
    Points
    110,910
    Level
    100
    Thanks
    14,394
    Thanked 8,785x 5,719 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    Hello Dave,

    that's it.

    The Ploessls are nearly symmetric double achromats, and they beat the other EPs within the FOV of 40deg, when you dont go for the focus lengths shorter than about 15mm. They win when they come from TV, I mean.
    The orthos with the apochromatic Zeiss Abbe triplet beat the other EPs for the shorter focus lengths. That's again the physical optics.
    When you need 60deg sharp and contrasty FOV, then 7 lensers designs come in the nomination. And here are the Swarovski and Zeiss the leaders, or for less money eventually the Delos. With the Delos you save some money against Swaro and Zeiss, but you obtain more size, more weight, and thick lenses inside which scatter away more light.
    I am not quite sure about the 82deg (plus) EPs, maybe the Docter is the choice, but I don't need so much the 82deg or 85deg.

    So, I have also paid money for my lessons learned, see my album http://www.astronomyforum.net/member...eyepieces.html

    Thanks for your comparison,

    JG
    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.

  10. #10
    Davesellars's Avatar
    Davesellars is offline HYPER GIANT
    Points: 27,721, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Overall activity: 0%
    Achievements:
    2 Posts Achievement20 Posts Achievement!5 Threads Achievement!50 Posts Achievement!200+ Posts Achievement!
    Join Date
    Sep 2014
    Location
    Belper
    Posts
    4,701
    Points
    27,721
    Level
    100
    Thanks
    911
    Thanked 1,570x 1,197 Posts

    Default Re: ES 82 deg 18mm vs TV 50 deg 15mm Plossl

    JG, how do you rate the Pentax XW eyepieces you have against the really expensive glass? I notice these have recently followed the same pricing hike as the TV Delos.

    I'd say that the 15mm TV Plossl was visually equal in excellence to my 14mm TV Delos (certainly at f7.5). It was excellent as well in my f/5 refractor. I sold mine for the same price I bought it to part fund my Delos...
    j.gardavsky and spelunkerd like this.

    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    etc:
    To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
    12" Dob; Skywatcher 80ED & 120ST; EQ5; Grab and Go Alt/Az; 60mm RACI & Rigel Quickfinder.
    Eyepieces: Tele Vue Panoptic 24mm, Delos 10/14/17.3mm; Pentax XW 5/7mm; ES Maxvision 28mm; Baader Classic 10/32mm
    Filters: Astronomik UHC and OIII; Baader OIII; ES H-Beta
    Herschel 400 (H1) Count: 162

 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. For Sale - USA: Celestron 1.25" 25mm & Meade 15mm Plossl Brand new $30 shipped
    By LightTraveler in forum Astronomy Classifieds
    Replies: 2
    Last Post: 02-01-2015, 03:17 PM
  2. Tele Vue 15mm Plossl vs Meade 14mm S 5000 UWA
    By MarcoAntonio in forum Telescope Eyepieces Forum
    Replies: 3
    Last Post: 11-18-2013, 11:06 AM
  3. Celestron Omni barlow + 15mm plossl, Review from a noob perspective
    By k1llua in forum Telescope Eyepieces Forum
    Replies: 1
    Last Post: 05-18-2013, 04:55 AM
  4. opinion on TV 15mm plossl
    By Nickwatcher in forum Astronomy Beginners Forum
    Replies: 5
    Last Post: 02-07-2011, 04:49 PM
  5. For Sale: NEW Meade 15mm super plossl multi coated lens
    By alanbreslow in forum Astronomy Classifieds
    Replies: 0
    Last Post: 11-16-2009, 08:50 PM

Tags for this Thread

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 06:50 AM.