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Thread: 4mm KK ortho

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    Default 4mm KK ortho



    at the time these were still available I still owned my 9.25 SCT so I only picked up a 9mm and 12.5mm. Now that I have my f/4.6 14" Dob inbound the 4 or 6 mm have become of significant interest to me. While I troll the used market hourly for one my hopes dwindle with each passing day .... So, anyone care to suggest an EP that can possibly match their performance ?

    I'm assuming something like a 4.5mm Delos would fit the bill - ignoring the 3x cost of cost ....?
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    Default Re: 4mm KK ortho

    Siebert Optics Starsplitter perhaps? 60° AFOV
    Siebert Optics - Eyepieces - 1.25"
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    Default Re: 4mm KK ortho

    Do you own one of these and can compare it to a KK?
    Intercepting & temporarily inconveniencing light photons as they travel through the universe since 1989
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    Default Re: 4mm KK ortho

    I have 4 of them, they work very well and I use them for planetary observations along with my Fujiyama.
    I have used them for a couple of years now and have no complaints abut their quality/ views.
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    The weakest link in the optical chain is the large nut located directly behind the
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    Ya gotta keep this Apo/
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    Default Re: 4mm KK ortho

    Delos is almost as good as a KK Ortho. Wider field but just a mere tad short on contrast.
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    Default Re: 4mm KK ortho

    I will add the Siebert have good contrast and clarity but it is very hard to beat a KK Ortho!
    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
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    The weakest link in the optical chain is the large nut located directly behind the
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    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: 4mm KK ortho

    If you have to have the KK:
    https://www.teleskop-express.de/shop...bbe-ortho.html

    That is the route I went to complete my set. Downside is the shipping @ 33 Euros.

    Just for grins - if the Scope can hold up to it the Vixen HR 3.4:
    https://agenaastro.com/vixen-3-4-mm-...ece-37135.html
    Moving on.......

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    Default Re: 4mm KK ortho

    You could try Astronomy & Electronics Centre I don't know what he would charge for postage, but it would be worth checking.

    If your budget is up to it, you could always try this one: https://optcorp.com/products/tele-vu...-zoom-eyepiece I find it has a excellent contrast, and it is 4 eyepieces in one! (... and great value if you can get it used like I did. )

    Good luck,

    Dean
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    Default Re: 4mm KK ortho

    j.gardavsky and SpyderwerX like this.
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    Default Re: 4mm KK ortho

    Quote Originally Posted by Nimitz View Post
    at the time these were still available I still owned my 9.25 SCT so I only picked up a 9mm and 12.5mm. Now that I have my f/4.6 14" Dob inbound the 4 or 6 mm have become of significant interest to me. While I troll the used market hourly for one my hopes dwindle with each passing day .... So, anyone care to suggest an EP that can possibly match their performance ?

    I'm assuming something like a 4.5mm Delos would fit the bill - ignoring the 3x cost of cost ....?
    Hello Nimitz,

    when you are looking for the short focus eyepieces for your 14" Dob, then there is not much to choose besides the wide fields.
    And you are right, that the Delos (or Pentax XW, I would add) are to be considered very seriously.
    A set of 3 these eyepieces costs as much as the Leica WW (up to 80° AFOV) Aspheric 25x - 50x (9mm - 18mm) Zoom, barlowed 2x with the apochromatic Baader VIP, so it is difficult to save costs on the top of the premium league.

    As Dean has posted, the Tele Vue Nagler 3mm - 6mm Zoom with more FOV than the Abbe orthos, would not be a bad choice at all.

    The BCO 6mm ortho (52° AFOV) plus the Baader Q triplet Barlow is nearly heads on with the TV Nagler Zoom, or one hair better. The combo of the Baader VIP apochromatic barlow with the BCO will be tested as soon as it comes next week.

    I would not pay much attention to the otherwise very good Vixen eyepieces, as your Dob is with F/4.6 a fast scope.

    Best,

    JG
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