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Thread: Is a 2" eyepiece practical for my scope?

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    Default Is a 2" eyepiece practical for my scope?



    Hi - I recently purchased an Orion StarSeeker IV 150mm GoTo Mak-Cass. It will accept 2" eyepieces, but I'm wondering if it's really worth it for my scope. I've been using the scope for a few months now and would love to be able to get a decent quality, wide view, low power eyepiece.

    I'm just concerned that, although my scope will accept 2" eyepieces, the actual performance might be disappointing - especially considering I'd also have to purchase a 2" diagonal.

    Any thoughts?
    Equipment: Orion StarSeeker IV 150mm GoTo Mak-Cass Telescope, Celestron 8x42 binoculars, Canon Rebel T1i
    Lenses: Orion 32mm Sirius Plossl , Orion 12.5mm Sirius Plossl, (Svbony 23mm wide-field eyepiece, Svbony 10mm eyepiece - came with scope), Accessories: Orion Shorty 1.25" 2x Barlow, 1.25" Orion Variable Polarizing Filter

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    Default Re: Is a 2" eyepiece practical for my scope?

    I enjoy the view through my 2" eyepiece. Since your Mak-Cass has "slow" optics it should do quite well with a mid range eyepiece like the Agena 32mm SWA (Agena Super Wide Angle Eyepiece - 32mm). Keep in mind that 2" diagonals come with an adapter for 1.25" eyepieces so you can sell your current diagonal to help offset the purchase.

    Off course, unless you invest in a focal reducer, your FOV will not be that wide even with a 2" eyepiece.
    David aka Shelldrake
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    Default Re: Is a 2" eyepiece practical for my scope?

    It would be fine. There is one thing to avoid. If you get a focal reducer to get a wider FOV you don't want to use an eyepiece with such a long focal length that you see the shadow of your secondary. For any reasonable exit pupil and focal reducer you'll be OK with eyepieces shorter than 40mm.
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    Default Re: Is a 2" eyepiece practical for my scope?

    Russell Optics has some excellent 2" widefeild eyepieces. Highly recommended.

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    Default Re: Is a 2" eyepiece practical for my scope?

    [QUOTE=Leveye;1058438487]Russell Optics has some excellent 2" widefeild eyepieces. Highly recommended.

    [url=http://www.Russell

    Absolutely. Gary is a wizard. He also uses Delrin for the bodies which saves a lot of weight.

    As to 2" with a Mak, I recently decided that it was worth it when I modified my ETX 125 with a Wegat adapter. Going to 2" won't be the maximum 2" experience but it will widen the show for a Mak.
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    Default Re: Is a 2" eyepiece practical for my scope?

    You Mak has baffle opening around 27mm which is max opening of 1.25" EP. This means that you will get vignetting with most except shortest FL 2" EPs. Vignetting will be more severe with longer FL, in particular when 0.63 reducer is used.

    2" EPs could be still used but the off axes area of FOV in 2" EP will be considerably darker than on axes. This dimming can easily amount to several magnitudes light reduction.

    So with shorter FL 2" EPs you will still get wider FOV than with 1.25", but 2" EP performance will be compromised.
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    Default Re: Is a 2" eyepiece practical for my scope?

    Thanks. One of the reasons I asked the question is because the scope cost me $1000. If I purchase a 2" eyepiece and diagonal there goes about $250 more. Add on a focal reducer and I've spent almost half as much as the scope. From what I've been reading, it sounds like I'm not going to get that much bang for the buck. Maybe I should just invest in a couple of better 1.25" eyepieces now since the scope came with some cheap ones. Then, start saving up for a better scope.
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    Equipment: Orion StarSeeker IV 150mm GoTo Mak-Cass Telescope, Celestron 8x42 binoculars, Canon Rebel T1i
    Lenses: Orion 32mm Sirius Plossl , Orion 12.5mm Sirius Plossl, (Svbony 23mm wide-field eyepiece, Svbony 10mm eyepiece - came with scope), Accessories: Orion Shorty 1.25" 2x Barlow, 1.25" Orion Variable Polarizing Filter

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    Default Re: Is a 2" eyepiece practical for my scope?

    Anything you buy for this scope can be used on future scopes. if you get the GSO 2" SCT diagonal GSO 2" 90-deg 99% Dielectric Mirror Diagonal for SCTs you can get a 2" nose piece also so it can be used with non SCT scopes.
    GSO Chrome Barrel from 2" GSO Refractor Diagonals


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    Default Re: Is a 2" eyepiece practical for my scope?

    Quote Originally Posted by rhliberman View Post
    Thanks. One of the reasons I asked the question is because the scope cost me $1000. If I purchase a 2" eyepiece and diagonal there goes about $250 more. Add on a focal reducer and I've spent almost half as much as the scope. From what I've been reading, it sounds like I'm not going to get that much bang for the buck. Maybe I should just invest in a couple of better 1.25" eyepieces now since the scope came with some cheap ones. Then, start saving up for a better scope.
    You should not regret your choice. 150mm Mak is a capable nice scope, enjoy! 2" EPs are bonus, not a necessity. Even though I have a few 2" EPs, most of my observing is done with 1.25". But you will benefit from good quality 1.25" EPs, since they can be used with any scope.

    For now I would recommend a good quality 32mm Plossl to get max FOV for your scope. Something like this

    GSO 1.25" Plossl Eyepiece - 32mm
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    Default Re: Is a 2" eyepiece practical for my scope?

    Hi - Thanks, I really don't regret getting this scope, and I knew there would be tradeoffs when I bought it. I actually purchased a 8" Orion goto, but carrying it up and down the steps was killing me. And the collimation drove me bonkers! It's a great scope, but not the best choice for a first scope so I exchanged it for the 150mm Mak to avoid having to deal with collimation. Because this one is so portable, I am using it a lot and having a blast. Overall, the quality is pretty good other than the limited FOV. I think upgrading the eyepieces will be a good investment.
    Filterxpert, Bigzmey and Ylem like this.
    Equipment: Orion StarSeeker IV 150mm GoTo Mak-Cass Telescope, Celestron 8x42 binoculars, Canon Rebel T1i
    Lenses: Orion 32mm Sirius Plossl , Orion 12.5mm Sirius Plossl, (Svbony 23mm wide-field eyepiece, Svbony 10mm eyepiece - came with scope), Accessories: Orion Shorty 1.25" 2x Barlow, 1.25" Orion Variable Polarizing Filter

 

 
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