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Thread: F/8.33 telescope a complete waste of money (for me)?

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    Default Re: F/8.33 telescope a complete waste of money (for me)?



    Alec, if you get this scope, I would suggest the larger mount. I have had an EQ3 Synscan previously, and it would really not be up to carrying a 120mm refractor. An EQ5 would be MUCH better for not a lot of extra money.
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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Alec, Why all the questions? Since you once sold cars, you already know the outcome.

    I look forward to reading your first light report with your new refractor.


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  3. #33
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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Quote Originally Posted by Larryp View Post
    I have had an EQ3 Synscan previously, and it would really not be up to carrying a 120mm refractor. An EQ5 would be MUCH better for not a lot of extra money.
    You are probably right Larry. I read a review by one guy who said "the 120 is right at the top of what my mount can handle, i.e. EQ3".

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  4. #34
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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Quote Originally Posted by sxinias View Post
    Alec, Why all the questions? Since you once sold cars, you already know the outcome.

    I look forward to reading your first light report with your new refractor.


    Joe
    My past is catching up on me Joe!

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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Hello Alec,

    I am just back from the winter skiing, and Marshall has dropped me a PM to jump into the discussion.
    All comments above are highly agreable, and I appreciate them.

    Good achro refractors offered on the Continent are the Nerius from Kasai Teleskop-Express: Tele Optik Nerius 152/900mm Grofeld Refraktor von Kasai - 3' OA with the K9/F4 achromat from O´Hara, and the same achromat has the Individual Series from the TS Teleskop-Express: TS 152/900mm Rich Field Refractor - 3' Crayford Focuser - Rich Field Refractor Telescope .

    When you chip in twice as much money, you can get an air-spaced triplet O'Hara 5" APO Astro-Professional APO 130 Refraktor OTA action by the Astro Professional, the best choice I can see tonight.

    These all three scopes are looking like good allrounders, both for the DSOs and planets. Moreover, any 6" achro can be stopped down to a 5" to get the CA reduced, should you worry about a CA in a fast 6" achro. The 5" APO from Astro Professional is not a light weight, like a 5" achro might be, but it is still short tube and easily portable.

    Best,

    JG
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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Thanks for your reply JG and I trust you had a good holiday.

    Some beautiful scopes on the links you gave, especially the Nerius!

    However, these 6 inchers are F/5.9. Getting back to my original post, my thoughts were to plug the gap in my current telescope line up which has F/11.8 at one end and F/5.0 at the other. I was thinking 120mm F/8.33 as middle ground but then wondered whether this focal length tends to be just a general all rounder?

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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Quote Originally Posted by Alec in France View Post
    Thanks for your reply JG and I trust you had a good holiday.

    Some beautiful scopes on the links you gave, especially the Nerius!

    However, these 6 inchers are F/5.9. Getting back to my original post, my thoughts were to plug the gap in my current telescope line up which has F/11.8 at one end and F/5.0 at the other. I was thinking 120mm F/8.33 as middle ground but then wondered whether this focal length tends to be just a general all rounder?

    Alec.
    Hello Alec,

    I am somehow a good friend of the fast optics, and my recommendation has been based more on a good quality for the money.
    On the today's markets it turns out to be difficult to win:
    - with F/8.33 you'll spend money on the ultra-wide EPs to enjoy the rich field DSOs and to turn it into a general purpose scope
    - the F/5.9 quality achros achieve nearly the HD (high definition) performance with the Swarovski eyepieces, which have been optimized and corrected for the older F/5.9 Swarovski achromatic spotting scopes, but you can get these EPs for 1/2 on the 2nd hand birders markets in the U.K.
    (On my cheap 6" F/5 Synta achro, the Swarovski EPs make quite a difference in reducing the CA, even if compared with the premium Pentax XW and Zeiss Fl T* Diascope eyepieces)
    - the F/6.9 APO will do a great job with nearly any cheaper EP, but the price of the APO OTA is twice as much as the price of an achro OTA

    The specials at the Astro-Professional are quite interesting, as watching the prices for the astro equipment in Germany, the trend of the prices for the better quality optics has been unfortunately increasing.

    Best,

    JG
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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Looking at your signature Alec, I don't think there any such thing for YOU as a "general all rounder". However, in my "early days" I did use my 120 XLT for everything.

    Just to throw a wrench into this discussion, how about a nice Russian TAL-125R
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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    Quote Originally Posted by AbbN View Post
    Just to throw a wrench into this discussion, how about a nice Russian TAL-125R
    Abb, it so happens a friend has a 2006 vintage Tal 100 on a wooden tripod with an equatorial mount. He's a guy who tried astronomy and found it wasn't for him. The poor old telescope gathers dust in a spare room. I could buy it from him quite cheaply. Its an F/10.0 but I so wish it had been a 125 rather than a 100. Maybe I should take another look as an unexpected garage bill has heavily dented the wallet!

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    Default Re: F/8.33 telescope a complete waste of money (for me)?

    You may want to read Astro-Baby's blurb on her TAL 100 - it may get you to rethink it

    TAL 100RS Review
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