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Tele Vue NP127is f/5.2 Petzval Refracting Telescope

SKU : TE-NPI-5054

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  • Aperture: 127mm (5")
  • Focal Ratio: f/5.2
  • Focal Length: 660mm
  • Optical Design: Apochromatic Refractor

Product Details

  • Never one to rest, Tele Vue took the opportunity to tweak the scope in small but meaningful ways. Both the optical and mechanical designs have been revised to reduce atmospheric defocusing sensitivity (visually the difference is virtually indiscernible). The new lens prescription delivers smaller spot sizes over a broader wavelength range than previously, while a new stainless steel front cell helps provide better thermal stability in extreme climates. Advanced multi-coatings are applied to maximize contrast and transmission. Still the fastest in the industry, there is just no competitive comparison considering its f/5.2 speed and flat-field.

    The instrument has also been mechanically updated from its longer captive dew shield to its new 10:1 focuser pinion assembly, made for Tele Vue by Starlight Instruments. Along with an all new gloss black anodized metalwork treatment, the handsome new shapes of the dew shield and rear cell bring a refined elegance to this high performance APO refractor.

    The non-vignetting focuser retains its 3" input and 2.4" output to reduce bulk and permits imaging across the largest commercially available CCD chips (52mm diagonal). No need for a heavier, more cumbersome 3" focuser. Every 2.4" focuser we make is tested to hold and drive a minimum of 6 lbs of weight in vertical orientation.

    Except for a new Focusmate Driver attachment (available shortly), all other Imaging System accessories fit as previously.

    Just what makes the TeleVue NP-127is so special? The standard by which it is built. The four-element air-spaced Nagler-Petzval system begins with a precision machined 660mm focal length optical tube that's fully internally blackened to prevent any stray light inflections. Then it's combined with a 127mm aperture extra low dispersion glass doublet as the primary lens with a with a secondary field-flattening/aberration-correcting extra low dispersion glass doublet at the opposite end. All optical surfaces receive index matched multi-coatings. This design offers up diffraction-limited apochromatic peformance - simultaneously correcting for field curvature, astigmatism, spherical aberration, coma, secondary spectrum and spherochromatism.

    Televue was determined to make the NP127is series optically, mechanically, and functionally as perfect as possible for imaging up to 50mm diagonal chips without penalty to its near ideal visual operation. How? By applying the developments created for the Televue-60is to the new NP101is and NP127is and then going beyond. The NP101 (f/5.4, 4") and NP127 (660mm, f/5.2, 5") maintain their optical specifications yet with redesigned 4-element optical systems. Larger rear lens groups absolutely minimize vignetting in formats up to 52mm diagonal. For these large chips an optional field corrector was developed so the corners of the newly brightened edges would virtually be as perfect as the center of the field.
  • specifications

    Aperture127 mm (5")
    Camera/Eyepiece Connection2" Nosepiece
    Corrected Image Circle30mm
    Dawes Limit0.91 arcseconds
    Focal Length660 mm
    Focal Ratiof/5.2
    Free ShippingYes
    Highest Magnification254x
    Light Gathering Power329x
    Limiting Magnitude14.3
    Optical DesignPetzval
    Tube Diameter127mm
    Tube Length846mm
    Tube Weight14.5 lbs
    Back Focus137mm
  • included items

    • NP-127is APO Refractor OTA
    • Sliding Captive Dew Shield
    • Custom Fitted Case
    • 2" Accessory Adapter
    • Imaging Insert

Product Reviews

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    Superb Imaging Scope

    I was planning to upgrade my imaging scope assortment and set my spending limit to $4k. I saw a used NP127is on OPT in excellent condition and couldn't pass it up at $6.8k. While my Atik 383L+ mono KAF8300 CCD chip doesn't take full advantage of the full size sensor illumination provided by the NP127is, the NP127is made a significant difference over my 8300 and 80mm APO at f6. Specifically, the flat field (no surprise), crisp details and color contrast. I noticed that with fairly dark skies or with narrow band imaging, the low intensity pixels are quite flat accross the field, so there is a minimal gradient on the background. I have about 16 images from my NP127is posted on Flickr, and comments are typically about the detail and sharpness. In the locations I image, the seeing is usually average at best, and this fast refractor does very well with resolution under not-so-great seeing conditions. I use the Tele Vue Large Field Corrector TE-LCL-1069. My recent narrow band image of the faint Sharpless 2-308 using the NP127is was selected for the NASA AstronomyPicture of the Day for December 24, 2013 at: You can also see other images done with my NP127is and the link to Flickr at my website: I have used it for about 25 nights so far, and I absolutely love it.