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Thread: 2.5 mm Tele Vue Nagler EP

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    Default 2.5 mm Tele Vue Nagler EP



    Has anyone used this EP in their refractor and if so your opinion and feedback are appreciated. thanks
    Scopes: TeleVue NP-101, Meade LX 90 8" ACF, DiscMount (DM-4) with Sky Commander
    EPs: Ethos 21 & 10, Nagler 31 & 2.5, Delos 8, 6, & 3.5, ES 14 100*,
    TV 2x barlow and various filters (e.g., Astronomik UHC, Lumicon O111, TV Planetary & Types A & B, Variable Polarizers)
    Lunt Solar Wedge
    Binoculars: AP 16x70 (Manfrotto Monopod); Zeiss 10x40B
    Local Club: Los Angeles Astronomical Society

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    Default 2.5 mm Tele Vue Nagler EP

    Yes, I have one of the 2.5mm type 6 Naglers that I picked up secondhand a while back. The eye relief is a lot better than the early 4.7mm Nagler I used to have, but not as big as you get with the type 4 12mm and 17mm Naglers. I find the 2.5mm quite usable, but not as comfortable as the type 4s.

    However, you need good optics (and seeing conditions) to be able to use it. It's way overpowered for use in an SCT, and my 80mm f5 achromat shows quite a lot of CA at that magnification - but when I was experimenting to see how far I could push my FSQ106ED with the extender (running at f8) on a night of near perfect seeing it worked very well - and I could probably have gone to a higher magnification if I'd had anything shorter - but it was nice to see Saturn, the moon, and Mars at around 340x - though at the very small exit pupil size, floaters in my eye were quite noticeable. It was also nice to see a perfect airy disk when I was looking at a bright star - a beautiful white diamond with perfect haloes on a velvet black background.

    So it's a nice eyepiece - especially given the short focal length - and the wide AFOV helps increase the drift time if you're not using a driven mount.

    But, the big question is, how often will you get to use it, and do you have a scope it would suit?

    If you have a high quality APO, it may be useful on those occasions where you have really good seeing. If you have a larger scope or an achromat it may be overkill - in general, smaller scopes seem to let you push the magnification more than larger ones - probably because the bigger ones hit the atmospheric magnification limits at longer eyepiece focal lengths.
    Last edited by jerryTheC; 09-28-2014 at 08:41 PM.

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    Default Re: 2.5 mm Tele Vue Nagler EP

    I was planning on using it in my TV NP-101 particularly to split double stars. I get the best view of planets when I barlow (2x) my 8 delos (which gives me 4mm) and sometimes with my 6 delos (which gives me 3mm). TV does not make a 2.5 ethos - there highest is 3.7mm.
    Scopes: TeleVue NP-101, Meade LX 90 8" ACF, DiscMount (DM-4) with Sky Commander
    EPs: Ethos 21 & 10, Nagler 31 & 2.5, Delos 8, 6, & 3.5, ES 14 100*,
    TV 2x barlow and various filters (e.g., Astronomik UHC, Lumicon O111, TV Planetary & Types A & B, Variable Polarizers)
    Lunt Solar Wedge
    Binoculars: AP 16x70 (Manfrotto Monopod); Zeiss 10x40B
    Local Club: Los Angeles Astronomical Society

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    Default

    Should do nicely then . I think televue also do a 2-4mm Nagler zoom which might also be worth considering.

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    Default Re: 2.5 mm Tele Vue Nagler EP

    I tried the zoom but the AFOV is not 82 but approx. 50 so the object drifts quickly in it.
    Scopes: TeleVue NP-101, Meade LX 90 8" ACF, DiscMount (DM-4) with Sky Commander
    EPs: Ethos 21 & 10, Nagler 31 & 2.5, Delos 8, 6, & 3.5, ES 14 100*,
    TV 2x barlow and various filters (e.g., Astronomik UHC, Lumicon O111, TV Planetary & Types A & B, Variable Polarizers)
    Lunt Solar Wedge
    Binoculars: AP 16x70 (Manfrotto Monopod); Zeiss 10x40B
    Local Club: Los Angeles Astronomical Society

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    Default

    I had the same problem with a Tak LE 2.8 - fine if you're using a tracking mount, but things drifted across too fast for manual tracking - The bigger field of view of the 2.5 Nagler came in really handy - that made it usable, where the smaller field wasn't.

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    Default Re: 2.5 mm Tele Vue Nagler EP

    thanks for the info - question: with a 12mm eye relief has that been a problem. Another thought someone ran by me is to get a 4.5 delos and barlow it (2x) which would give 240x (the scopes limit).
    Scopes: TeleVue NP-101, Meade LX 90 8" ACF, DiscMount (DM-4) with Sky Commander
    EPs: Ethos 21 & 10, Nagler 31 & 2.5, Delos 8, 6, & 3.5, ES 14 100*,
    TV 2x barlow and various filters (e.g., Astronomik UHC, Lumicon O111, TV Planetary & Types A & B, Variable Polarizers)
    Lunt Solar Wedge
    Binoculars: AP 16x70 (Manfrotto Monopod); Zeiss 10x40B
    Local Club: Los Angeles Astronomical Society

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    Default 2.5 mm Tele Vue Nagler EP

    While the eye relief isn't as big as my 17mm and 12mm type 4 Naglers, which I really like, I find the 2.5mm type 6 happily usable, if not as comfortable as the longer eye relief of the type 4s - it might be a problem if you wanted to wear glasses (I usually take mine off) - but the 2.5mm T6 is a huge improvement over the original 4.7mm Nagler, where the eye relief was shorter than my eyelashes .

    And one other point - with a high end refractor you may be able to push the magnification more than you think, given suitably good seeing - I was still getting good results at 340x in my 106mm scope and could have gone higher - the Tak manual reckons that you can push magnification to 100x/in or more given really good seeing... And I can easily believe that.

    As far as barlowing a Delos - yes, you could do that, but then you risk running into the short drift time problem again. You could always look at barlowing a longer Nagler if that gives you better eye relief - the bigger AFOV really helps to increase the drift time.
    Last edited by jerryTheC; 10-01-2014 at 11:43 PM.
    j.gardavsky likes this.

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    Default Re: 2.5 mm Tele Vue Nagler EP

    thanks for the feedback I is really insightful and helpful. They are having an Astro event and selling stuff and a 10% discount including TV equipment.
    Scopes: TeleVue NP-101, Meade LX 90 8" ACF, DiscMount (DM-4) with Sky Commander
    EPs: Ethos 21 & 10, Nagler 31 & 2.5, Delos 8, 6, & 3.5, ES 14 100*,
    TV 2x barlow and various filters (e.g., Astronomik UHC, Lumicon O111, TV Planetary & Types A & B, Variable Polarizers)
    Lunt Solar Wedge
    Binoculars: AP 16x70 (Manfrotto Monopod); Zeiss 10x40B
    Local Club: Los Angeles Astronomical Society

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    allen g's Avatar
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    Default Re: 2.5 mm Tele Vue Nagler EP

    Well I purchased the 2.5 nagler on Saturday and had a chance to use it last night in my TV NP-101. Wow, what an EP. I put it on Epsilon in Lyra and the split was magnificent. The contrast was excellent - the background coal black - all 4 stars were vividly seen better than ever - 4 perfect white circles. With 82 degrees can see all four close up at 216x. I also viewed the double star WZ Cassiopeia (one is a carbon) and that was also a beautiful sight as the carbon is red which looked terrific against the high contrast background. Wonderful first light with this EP.
    j.gardavsky likes this.
    Scopes: TeleVue NP-101, Meade LX 90 8" ACF, DiscMount (DM-4) with Sky Commander
    EPs: Ethos 21 & 10, Nagler 31 & 2.5, Delos 8, 6, & 3.5, ES 14 100*,
    TV 2x barlow and various filters (e.g., Astronomik UHC, Lumicon O111, TV Planetary & Types A & B, Variable Polarizers)
    Lunt Solar Wedge
    Binoculars: AP 16x70 (Manfrotto Monopod); Zeiss 10x40B
    Local Club: Los Angeles Astronomical Society

 

 
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