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Thread: Diagonal upgrade - go for 2 inch?

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    Default Diagonal upgrade - go for 2 inch?



    Hi all,

    I'm planning to upgrade the stock 1.25" star diagonal on my Celestron Omni 102 XLT refractor, and I'm wondering, since the focuser can accomodate it, if a 2" diagonal would be a better choice over a 1.25"?

    The main reason for upgrading the diagonal in the first place is that I'm sick of the flimsy build and small thumbscrews of the stock one. Comparing pros and cons of 2" vs. 1.25" diagonals, it seems the only real reason to go for a 2" is that I can (some day) use a low-power EP with a 2" barrel. On the other hand, the 2" diagonal is (of course) more expensive, heavier and bulkier.

    Any other points I should consider? Is the future option of using a 2" low-power EP worth the extra bucks and grams?

    Any advice is greatly appreciated!

    Cheers, /Patrik
    Celestron Omni XLT 102 refractor, Celestron UpClose 10x50 binoculars.

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    Default Re: Diagonal upgrade - go for 2 inch?

    Definitely go for the 2". With it, you have the option of using either 2" or 1.25" eyepieces. Without it, you don't have an option.
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    Default Re: Diagonal upgrade - go for 2 inch?

    Quite a few 2" diagonals come with 1.25" adapters so you don't necessarily NEED to switch to 2" EP's right away...

    I use a 2" diagonal on my ED80 with 1.25" EP's... and a 1.25" diagonal on my 5SE as a 2" diagonal would be WAY too bulky for it with the reducer, motofocus etc attached.

    With a refractor, this is not 'that' big of a deal... I think you'd like a 2" diagonal just fine. Even if you get a good 1.25" dielectric... you will notice a nice difference over the OEM unit. My WO 1.25" diagonal just got here yesterday, and the difference was very noticeable.

    Really boils down to preference.
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    Default Re: Diagonal upgrade - go for 2 inch?

    I have a 2", 99% dielectric diagonal on my 120mm refractor. I installed it when I installed the Crayford 2x focuser. I use a low power 2" eyepiece when I'm "hunting", but use the 1.25" adapter/eyepieces at higher magnifications.

    Here's another "reason"… may be Voodoo for all I know. I once heard that the best part of a diagonal's mirror was in the center, so I figure I'm ahead using one anyway.

    BTW: Consider adding a 35mm extension between the focuser tube and the diagonal.

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    Default Re: Diagonal upgrade - go for 2 inch?

    Hi Patrik. I have upgraded both my 5" and 6" refractors to the 2" dielectric diagonals, as well as the GSO dual speed Crayford focusers. I could use my 1.25" eyepieces, with the included adaptor, until I acquired some 2" eyepieces. Also, the dielectric diagonals, besides having a higher reflection (99%), should resist tarnishing for a much longer period of time, than a standard diagonal. I think that it was money well spent on my telescopes. I hope this helps Patrik, and best wishes on your diagonal decision.
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    Default

    Yes, I'd go for the 2" - low power 2" eyepieces allow a much wider true field of view than 1.25" ones, and several low/medium power ultrawides are only available in 2".

    Having used a number of 2" diagonals, from budget to Baader, I've found the main difference to be in build quality - all of them have worked fine; my favourite is probably the Baader Clicklock - I find the rotate to clamp mechanism nicer than the usual thumbscrews - but even the budget ones have performed well.

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    Default Re: Diagonal upgrade - go for 2 inch?

    Quote Originally Posted by Makuser View Post
    Hi Patrik. I have upgraded both my 5" and 6" refractors to the 2" dielectric diagonals, as well as the GSO dual speed Crayford focusers. I could use my 1.25" eyepieces, with the included adaptor, until I acquired some 2" eyepieces. Also, the dielectric diagonals, besides having a higher reflection (99%), should resist tarnishing for a much longer period of time, than a standard diagonal. I think that it was money well spent on my telescopes. I hope this helps Patrik, and best wishes on your diagonal decision.
    Couldn't agree more Marshall!
    Best two investments I ever made on my beastie 6" f/8 were the focuser and diagonal. You may find, as I did, the heavy diagonal helps with getting the eyepiece off the ground just a bit by rebalancing your OTA. This allows you to move the scope up the mounting dovetail a bit, and every little bit helps!
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    Default Re: Diagonal upgrade - go for 2 inch?

    Quote Originally Posted by jimminCT View Post
    You may find, as I did, the heavy diagonal helps with getting the eyepiece off the ground just a bit by rebalancing your OTA. This allows you to move the scope up the mounting dovetail a bit, and every little bit helps!
    Jim, I never thought of that! As my granddaughter would say, "How cool!"
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    Default Re: Diagonal upgrade - go for 2 inch?

    2" wins in my book.
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    Default Re: Diagonal upgrade - go for 2 inch?

    Quote Originally Posted by Lowjiber View Post
    BTW: Consider adding a 35mm extension between the focuser tube and the diagonal.
    Can you tell me what the purpose of that extension would be?
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