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Thread: Explore Scientific EP kits - why mix barrel sizes?

  1. #11
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    Default Re: Explore Scientific EP kits - why mix barrel sizes?



    You can always buy the set and then sell off or trade the eyepiece you don't want. People seem to have no trouble selling ES eyepieces.
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    Eric

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    Default Re: Explore Scientific EP kits - why mix barrel sizes?

    Here's a different way of saying what others have suggested: You don't buy eyepieces based on barrel diameter. You buy based on field of view (and perhaps eye relief). The field of view is what determines the needed barrel diameter. There is no reason to put an eyepiece into a 2-inch barrel if it's not needed. Baader offers some that can convert to either barrel, but that would only be for convenience.

    And I agree with those who say kits frequently offer items that you won't use. Someone elsewhere on this forum once posted that you only really need three eyepeices: a 50 - 70 power wide field, a 90 - 120 power, and a 120 - 150 planetary. The latter doesn't need to be wide field.

    Here's a cool eyepiece calculator that will help you figure out what will work well for your scope:

    Eyepiece Calculator
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    Default Re: Explore Scientific EP kits - why mix barrel sizes?

    Hey Bryan,
    Maybe your wife can negotiate a deal for him.
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    Rich (Filterxpert)

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    Default Re: Explore Scientific EP kits - why mix barrel sizes?

    Quote Originally Posted by Filterxpert View Post
    Hey Bryan,
    Maybe your wife can negotiate a deal for him.
    Maybe. But I'm saving her up to see if she can hammer them into selling me an AR152 on a Twilight II mount for $300.00.
    Bryan

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    Default Re: Explore Scientific EP kits - why mix barrel sizes?

    Since you use an EdgeHD 8" as I do I'd not down grade the kit because of the size of the barrels. A 2" VB on an Edge with a 2" diagonal can be had for a reasonable cost. I use the 82* kit with great success on my HD 8". It also depends on what you like to view. Try giving ES a call and see what they would recommend. They can also give you a reason for the difference in barrel sizes as the eyepiece focal length changes. Hope this helps.

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    Default Re: Explore Scientific EP kits - why mix barrel sizes?

    Quote Originally Posted by gregl View Post
    ...
    Someone elsewhere on this forum once posted that you only really need three eyepeices: a 50 - 70 power wide field, a 90 - 120 power, and a 120 - 150 planetary. The latter doesn't need to be wide field.

    Here's a cool eyepiece calculator that will help you figure out what will work well for your scope:

    Eyepiece Calculator
    ... there has been not only someone.

    Even better is to relate the choice of the eyepieces with the exit pupils: 1mm - 2mm - 3mm, or even 4mm-5mm, when you are blessed with really dark and clear skies.

    Best,

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    Default Re: Explore Scientific EP kits - why mix barrel sizes?

    And here is little old me who, on the other hand, does have a focuser with 2" capacity but chooses, for the moment anyway, to only use 1.25" eyepieces. I have no need for mixed barrel format kits.

    Two reasons really. No, make that three!

    1. My crappy focuser only works as well as I need it to because of the Howie Glatter Parallizer. The Parallizer is a 2"-to-1.25" adapter that is very effective at overcoming the external and internal 'slop' that is served up when you dine at the table of imported mass-production.

    2. Weight up at the front end. Those larger 2" format eyepieces are really starting to push the limits on their BMI.

    3. Cost/benefit ratio. When I last did this exercise using the 24mm 1.25" ES 68° and the 24mm 2" ES 82° eyepieces as examples, a tiny 1/5th increase in the TFOV at the same magnification would have cost me twice as much.

    So, for the moment anyways, as I dream of all those 1.25" ES eyepieces still to come, my 1.25" Parallizer can remain happily and permanently ensconced in the 2" extended length adapter in my 8" Skywatcher's 2" focuser.

 

 
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