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    Default 2-4mm Nagler Zoom



    In other posts I have made mention of this eyepiece and how I used it with a 10" dob to try to see what it would be like to view objects at very high power.

    Some forum members have asked my opinion on this eyepiece prior to a possible purchase so I feel a responsibility to make a few clarifications.

    The Nagler 2-4mm Zoom is a great eyepice, well built, sharp views and it's a Tele Vue.

    It has a 50* F.O.V. and a 10mm Eye Relief - its a small piece of glass.
    When it's rotated it stops at click stops @ 2-2.5-3-3.5 and 4mm.

    It is NOT recomended for Focal Lenghts over 800mm.

    It would be best for Smaller Refractors 3 to 4".

    In other words: A 1000mm F/L telescope would yield views @ 500x, 400x, 333x, 285x and 250x. I have been told that more than half of these magnifications are not very practical.

    Keep in mind " NOT RECOMENDED" over 800mm F/L is Tele Vue's words not mine.

    I really don't know too much about eyepieces as I am new myself. However I think I may be right about this.

    For those with more experience please confirm or debate.

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    I can understand why Televue would say that and would reckon that seeing conditions a lot of times would cancel out higher magnification.

    However, I think there is great utility for this EP in a scope such as yours than can handle a higher upper limit limit magnification on a night of exceptional viewing. Again, we are primarily referring to planetary viewing here.

    I came across the same thing with Orion customer service that said I wouldnt be able to focus a shorter length EP in my XT8i; hence, 300x was my practical limit. I knew they were being conservative because seeing conditions do make this limit a real number. However, there was no problem focusing in my experience, As I have mentioned, I have pushed to 400x with no problem in my 8 inch Dob.

    Upper limit for your scope is 60x your aperture or 600x--of course, this will be a rare occurrence, but my bet is you will happily achieve this someday with continued outings (and you have the EP to approach this). For example, there are some upcoming shadow transits of Saturn's moons where this could prove handy. As others have mentioned, contrast and brightness will suffer at this magnification for viewing planets.

    Bottom line is this rather expensive EP will likely see most use in the small refractors you mention---but certainly wont be useless in your arsenal, just depends on the right conditions.
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    Instruments: Obsession 15" Dob; Orion XT8i; 2" refractor (Galileoscope); Televue EP arsenal; Bushnell 7X50 binos
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    Default

    Quote Originally Posted by MarkM View Post
    I came across the same thing with Orion customer service that said I wouldnt be able to focus a shorter length EP in my XT8i; hence, 300x was my practical limit. I knew they were being conservative because seeing conditions do make this limit a real number. However, there was no problem focusing in my experience, As I have mentioned, I have pushed to 400x with no problem in my 8 inch Dob.
    Good to know. I have made all my purchases in accordance with the 300x limit and never attempted to push it.

 

 

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