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Thread: High Power wide view

  1. #11
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    Default Re: High Power wide view



    Quote Originally Posted by j.gardavsky View Post
    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
    Thank you JG, great reads & comments.
    My French is sehr schlect - in google translate it spoke about color near the bezel - that is where the glass is held in the last group before the eye?
    j.gardavsky and SpyderwerX like this.
    Moving on.......

  2. #12
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    Default Re: High Power wide view

    You will like the binoviewer.
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  3. #13
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    Default Re: High Power wide view

    Quote Originally Posted by sketrip View Post
    Thank you JG, great reads & comments.
    My French is sehr schlect - in google translate it spoke about color near the bezel - that is where the glass is held in the last group before the eye?
    Hello Sketrip,

    with my rough French, the criticism of Pentax XW on webastro reads as related to the CA of the Pentax XW EPs,
    when used on Moon and on the planets.
    Yes, these EPs are not the planetary EPs, however, they are the wide field photon pumps for the faint fuzzy galaxies,
    and it is not easy to find a good comfortable-to-use replacement.

    In technical terms, any wide field and ultrawide eyepiece adds or increases the CA, and the spherical aberration.
    The CA, and the spherical aberration is best controlled in the compensating eyepieces designed for the highest resolution microscopy, but the AFOV is typically around 40° up to 50°, and on the fast scopes you would ideally need an apochromatic field flattener, or a quality Barlow, to have the whole AFOV sharp edge to edge.
    Through the Leitz Periplan GF eyepiece, I can see the Cassini division with a true black and white contrast, not just grey,
    and very sharp, and even at the low magnifications.

    A more comfortable but more expensive alternative is the discontinued Leica B 40x (f=11mm) eyepiece, which beats by a visible difference the other eyepieces Leica B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW

    The long rant end, I am glad to have the Pentax XW 3.5mm, as sometimes I am looking for the observing comfort.

    Best,

    JG
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    Default Re: High Power wide view

    Well.... After 2 months of ruminating, reading everything in sight and over thinking...

    Eliminated the Pentax, 72° AFOV was not going to give the desired fov and the longer eye relief is not in my comfort zone so scratch that one. It would have only given an improvement from .21° to .34°, just not that big a bump. Had a hard time letting it go though

    Next off the list was the Vixen , better ER and an improvement to a .42° TFOV - from what I could research a good EP but finicky about eye placement. I was a little taken aback by that in the reviews - the HR is phenomenal in every way - but, it is a different line & the comments came from good sources with similar tastes as my own. (Sorry Gabby, don't @ me )

    The TV was never in budget.

    Able to find the Lunt/APM is essentially the same as the Optimus - now at $100 US less - so the winner is:
    The Lunt/APM ordered today:
    https://www.eyepiecesetc.com/APM_Lun...p/17101035.htm

    It is gaining a very good reputation - I'll holler should the clouds in the Midwest ever again part an first light actually happens.....
    Moving on.......

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    Default Re: High Power wide view

    Congrats! That looks awesome. It definitely doesn't look as big as the TV Ethos either. APM and Lunt both have a very good rep, so I think that is a sound decision. Definitely give a status report when you can. Yep, I see it coming, you gonna need a bigger EP case!
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  8. #16
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    Default Re: High Power wide view

    Quote Originally Posted by SpyderwerX View Post
    Congrats! That looks awesome. It definitely doesn't look as big as the TV Ethos either. APM and Lunt both have a very good rep, so I think that is a sound decision. Definitely give a status report when you can.
    Thanks Frankie!

    Yep, I see it coming, you gonna need a bigger EP case!
    That ship sailed one Vixen HR ago.... :LOL:
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    Moving on.......

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    Default Re: High Power wide view

    Congratulations Steve! That should work well in the SV
    It looks almost as tall as my Speers-Waler zoom!
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    Default Re: High Power wide view

    Congrats Steve!

    Looking forward to your report,

    JG
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    Default Re: High Power wide view

    Looks great.
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    Default Re: High Power wide view

    Quote Originally Posted by Gabby76 View Post
    Congratulations Steve! That should work well in the SV
    It looks almost as tall as my Speers-Waler zoom!
    Quote Originally Posted by j.gardavsky View Post
    Congrats Steve!

    Looking forward to your report,

    JG
    Quote Originally Posted by Shorty Barlow View Post
    Looks great.
    Thanks!

    The report will come should the skies ever clear....
    I now have a nice collection of photon catching devices that have never caught any.
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    Moving on.......

 

 
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