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Thread: High Power wide view

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    Default High Power wide view



    Don't get me wrong - love the Vixen HR & KK's at high power. There are times when I'd like to get a little wider view before drilling down.
    & cutting down the movement when using the M2 mount. Everything moves at warp speed when a high mag EP is installed.

    The SV102T with the 42° Vixen & KK's has a .21° field of view & I'm strongly considering a wider view at the 3.5mm range (200X)

    Potential candidates
    Pentax SMC XW 3.5mm: The AFOV of 70° would yield a .34° TFOV but the 20mm of ER may be a little long my taste. 14.3 oz (405g)
    Specs here:
    https://agenaastro.com/pentax-1-25-s...3-5-70511.html

    Vixen SSW 3.5mm - AFOV of 83° yields a .42 TFOV with 13mm of ER (well in my comfort zone) @ 8 oz (231g)
    Specs:
    https://agenaastro.com/vixen-3-5mm-s...ece-37121.html

    And behind door number 3...
    Stellarvue Optimus 3.6 mm - The 110° AFOV provides a TFOV of .55° ER is 15mm. 17 oz (482g)

    So my fellow enablers what think you of the above?
    Any other nominations?

    (yes, I know I'm woefully lacking in the low power department, but that is another post )
    Moving on.......

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    Default Re: High Power wide view

    A tough choice with the Pentax and Vixen.
    I think the only really advantage from the Vixen is the larger AFOV. Both will give excellent views.
    No opinion on the Optimus though
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    Default Re: High Power wide view

    I think all would be great choices. But alas, one more entry into the wide field/high mag department would be the TeleVue Nagler 3.5mm. Tele Vue Optics: Nagler

    Eye relief is stated at 12mm, but in reality I feel it to be just a touch shorter. Usually can be found on the used market for around 2 bills.
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    Default Re: High Power wide view

    Hello Sketrip,

    I have the Pentax SMC XW 3.5mm, but not using it very frequently besides on the planetary nebulae, galaxies,
    and a casual Moon walk through a green filter for fun.
    On the galaxies, the Pentax SMC XW eyepieces count to those EPs with the maximum transmissivity among the wide field EPs.
    So, the galaxies are looking brighter through Pentax, than through the other wide field EPs, as reported by others, and confirmed by my little myself. On the galaxies brightness, they also win over the Swarovski EPs.

    Best,

    JG
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    Default Re: High Power wide view

    Quote Originally Posted by Gabby76 View Post
    A tough choice with the Pentax and Vixen.
    I think the only really advantage from the Vixen is the larger AFOV. Both will give excellent views.
    No opinion on the Optimus though
    The Vixen has the early lead, it would double the FOV at 1/2 the weight.
    As to the Optimus - not easy to get info on it & no one here seems to have used one. I know there is a thread here with some of that info
    & I'll have to keep searching for info about it.

    Quote Originally Posted by SpyderwerX View Post
    I think all would be great choices. But alas, one more entry into the wide field/high mag department would be the TeleVue Nagler 3.5mm. Tele Vue Optics: Nagler

    Eye relief is stated at 12mm, but in reality I feel it to be just a touch shorter. Usually can be found on the used market for around 2 bills.
    Interesting - same basic size & specs as the Vixen - also the least expensive of the 4, who'd a thunk it?


    Quote Originally Posted by j.gardavsky View Post
    Hello Sketrip,

    I have the Pentax SMC XW 3.5mm, but not using it very frequently besides on the planetary nebulae, galaxies,
    and a casual Moon walk through a green filter for fun.
    On the galaxies, the Pentax SMC XW eyepieces count to those EPs with the maximum transmissivity among the wide field EPs.
    So, the galaxies are looking brighter through Pentax, than through the other wide field EPs, as reported by others, and confirmed by my little myself. On the galaxies brightness, they also win over the Swarovski EPs.

    Best,

    JG
    The Pentax has 8 elements in 5 groups, Optimus 8/6, SSW & Nagler 7/4. How do they get higher transmissivity with more glass?
    As always JG, you make it sound great.
    j.gardavsky and SpyderwerX like this.
    Moving on.......

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    Default Re: High Power wide view

    Quote Originally Posted by sketrip View Post
    ...
    The Pentax has 8 elements in 5 groups, Optimus 8/6, SSW & Nagler 7/4. How do they get higher transmissivity with more glass?
    As always JG, you make it sound great.
    Hello Sketrip,

    nobody knows exactly why the Pentax SMC XW outperform the other 70° FOV EPs on the galaxies, so I can just guess.

    - The SMC spectral multicoatings may pass more light on the wavelengths below 450nm.
    - The lens systems may have less of the classic BK7 which absorbs the short wavelengths
    - The other designs may dim the short blue/violet light to avoid the CA bloating of the stars - as typical for Swarovski

    The galaxies emit most of the light in blue-violet-UV. And that's pretty critical, as the senisitivity of our dark adapted vison drops below 450nm.

    Otherwise, there is a discussion relevant to your question in https://www.webastro.net/forums/topi...5-ou-delos-35/

    and there is an old classic on the wide EPs in another corner of our Earth, Pentax - Naglers shootout [Archive] - IceInSpace

    Best,

    JG
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    Default Re: High Power wide view

    Another contestant?

    Lunt XWA APM/Lunt XWA HDC Hyperwide 3.5mm 110º eyepiece--1.25"/2.0"

    Same specs as the SV @ $84 US less
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    Moving on.......

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    Default Re: High Power wide view

    Oh, what the heck. If ya gonna dive into the pool, might as well be the deep end! TELEVUE ETHOS, 2"/1.25", 9-ELEMENT, 3.7MM, 110 DEGREES
    ~Frankie~ My mind: Always on...Slightly off.
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    Default Re: High Power wide view

    Get the Pentax, better yet, get two of the Pentax and a binoviewer
    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
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
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    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: High Power wide view

    Quote Originally Posted by SpyderwerX View Post
    Oh, what the heck. If ya gonna dive into the pool, might as well be the deep end! TELEVUE ETHOS, 2"/1.25", 9-ELEMENT, 3.7MM, 110 DEGREES
    My water wings aren't rated for water that deep!

    Quote Originally Posted by Gabby76 View Post
    Get the Pentax, better yet, get two of the Pentax and a binoviewer
    Good idea, it would be about the same cost as the TV....
    Moving on.......

 

 
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