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  1. #1
    caheaton's Avatar
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    Default Hyperion and/or Stratus XT10i



    Hello. I'm interested in getting a few of these (having used a 21mm in the past and enjoying the views). I would like to use these in 2 inch mode, but am a little concerned as at least one person has reported being unable to bring these to focus in 2 inch mode with his XT8. Does anybody in the forum have experience with these in the XT series (while in 2 inch mode)?
    Craig

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    Default

    I have the Orion Stratus 8mm, 13mm and 21mm EPs. Using them in my XX12i Dob, one of them I can't bring into focus in 2"-mode. I can't remember which one. I use all of them in 1.25"-mode.

    With an eyepiece capable both 1.25" and 2" mode I don't think there's any advantage or disadvantage to using them either way. At least that's what I've heard or read somewhere.
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  3. #3
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    Default

    Yeah I recently got a Hyperion 13mm to use with my XT8 and it wouldn't come into focus when using it as a 2" EP, but had plenty of room when I put my 1.25" adaptor in using all configurations of magnification..

    Been wanting to try the lens out with my mom's XT10 but we got hit with that tropical storm down here..been nothing but clouds and rain for eons...frustrating..and the last time it cleared up we had a full moon raging...GRR!!

  4. #4
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    Default

    Using eyepieces more powerful then 25 mm in two inch mode does absolutely, positively, nothing for the view your eyeballs see... The field stop in the eyepiece is the limiting factor and its not until you get into eyepieces above 26 mm that the field stops start to increase in size...

    Therefore ALL of my higher Powered eyepieces (under 25 mm ) are 1.25 inch format and ALL of my lower powered (26 mm and higher) are in 2 inch format...

    Seriously you do not gain a thing using one of these eyepieces in 2" mode...

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    David I. (11-17-2009),sedativechunk (11-17-2009)

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    Default

    I understand that I don't gain any in FOV...I was just looking at convienence and to a lesser extent stability (if I decided to use the camera threads to attach a camera for lunar and planetary work). In that case the 2 inch would be a bit more solid. In the former case, it just saves having to replace the 1.25 inch adapter after using a 2" finder EP.
    Craig

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    Default

    I'm sure you'd need a small extension to bring it into focus using the 2" lens configuration. I know that's a fact for my XT8. We're going to finally get sometime tomorrow night to try the 13mm with my mom's XT10 so I can verify for sure the back foucus situation but from past experience using them both I'm pretty sure it won't have enough back focus for that lens in 2" mode either..

  8. #7
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    Default

    Quote Originally Posted by Bob327 View Post
    Using eyepieces more powerful then 25 mm in two inch mode does absolutely, positively, nothing for the view your eyeballs see... The field stop in the eyepiece is the limiting factor and its not until you get into eyepieces above 26 mm that the field stops start to increase in size...

    Therefore ALL of my higher Powered eyepieces (under 25 mm ) are 1.25 inch format and ALL of my lower powered (26 mm and higher) are in 2 inch format...

    Seriously you do not gain a thing using one of these eyepieces in 2" mode...

    Bob G
    Interesting post. I'm all for 1.25 eyepieces right now. I don't have any 2 inch eye pieces yet and all of my filters are in 1.25. In my opinion, anything less than 10" is practically useless unless it's ridiculously clear out.

    Whats your opinion on a 2 inch eyepiece around 32mm to 40mm with a hydrogen alpha/beta filters for finding real faint objects with my XT8? I've been wanting to get some low powered eyepieces for finding faint galaxies and nebula, all I have now is the stock 25mm eye piece.

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  9. #8
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    Default

    I have the three 2" lenses I use with my Xt8 every night. The Q70 26mm, and two from Agena being hte 32mm and 38mm. That covers all I'll ever need for low power wide angle viewings..for now anyway! LOLOL
    I use the Baader UHC-S 2" nebula filter with em and it works great. Also use that 2" filter with my Hyperion 13mm.
    I recommend all three of those 2 inch lenses. They're a lot of fun to use and they make finding and viewing the fuzzies a lot easier. Happy hunting!

 

 

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