Skip to content
ZWO EAFN Desktop
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

Country

David Astro Penta Prism Diagonal - 1.25"

SKU DAV-PENTA-1.25
Original price $0
Original price $149.00 USD - Original price $149.00 USD
Original price
Current price $149.00
$149.00 USD - $149.00 USD
Current price $149.00 USD
Price Match Policy!

Description

The David Astro Penta Prism 90-Degree Diagonal is a non inverting non reversing diagonal. It’s particularly suited for use with the David Astro Premium Linear BinoViewer, where its unique optical design delivers an accurate image orientation, eliminating the need for image inversion or mental adjustments common with traditional star diagonals.

At the heart of this diagonal is a pentagonal-shaped BK-7 glass prism, multi-coated on its transmitting surfaces and dielectric-coated on the reflective surfaces, which maximizes light transmission to the eyepiece. Unlike standard star diagonals that produce a mirror-reversed image, the Pentaprism Diagonal preserves the natural left-to-right orientation, making it invaluable for star navigation and terrestrial applications.

This 1.25” diagonal features a non-marring compression ring collar and a tapered barrel for secure attachment to any telescope focuser, and it’s threaded for 1.25” filters. With a generous clear aperture of 29mm, the diagonal avoids vignetting even with long focal length and wide-angle eyepieces, preserving field brightness and edge-to-edge clarity.

Designed with an optical path length (backfocus requirement) of 120mm, our Pentaprism Diagonal ensures compatibility with most telescope setups. When paired with the David Astro Premium Linear BinoViewer, it provides a correctly oriented view, ideal for terrestrial observation where orientation accuracy is essential. However, it may not yield the same results with other binoviewers that lack an integrated image-erecting lens.

Enhance your observing experience with the David Astro Pentaprism Diagonal, the ideal choice for astronomers and terrestrial viewers seeking clarity and orientation without sacrificing image quality.

Availability:
4 in stock

Free Shipping on most orders above $350*

More information

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)

You may also like

  • Original price $43.01 USD - Original price $43.01 USD
    Original price
    $43.01 USD
    $43.01 USD - $43.01 USD
    Current price $43.01 USD

    David Astro 90° Diagonal - 1.25"

    DAV-DIAG-1.25
    5 in stock

    The 1.25" Mirror Diagonal is a must-have accessory for astronomers, providing a comfortable viewing angle and improved image quality during telesc...

    View full details
    Original price $43.01 USD - Original price $43.01 USD
    Original price
    $43.01 USD
    $43.01 USD - $43.01 USD
    Current price $43.01 USD
  • Original price $109.00 USD - Original price $109.00 USD
    Original price
    $109.00 USD
    $109.00 USD - $109.00 USD
    Current price $109.00 USD

    David Astro 99% Dielectric Twist-Lock Diagonal - 1.25"

    DAV-DIG-TL-1.25
    9 in stock

    The 1.25" 99% Dielectric Twist-Lock Diagonal is an essential upgrade for astronomers seeking the best in optical performance and convenience. This...

    View full details
    Original price $109.00 USD - Original price $109.00 USD
    Original price
    $109.00 USD
    $109.00 USD - $109.00 USD
    Current price $109.00 USD
  • Original price $45.00 USD - Original price $45.00 USD
    Original price
    $45.00 USD
    $45.00 USD - $45.00 USD
    Current price $45.00 USD

    Celestron Star Diagonal - 1.25"

    CEL-94115-A

    Features Fits telescopes with 1.25" focusers or visual backs, 90° viewing angle, best for observing objects overhead Accepts standard 1.25" eyepiec...

    View full details
    Original price $45.00 USD - Original price $45.00 USD
    Original price
    $45.00 USD
    $45.00 USD - $45.00 USD
    Current price $45.00 USD
  • Original price $159.00 USD - Original price $159.00 USD
    Original price
    $159.00 USD
    $159.00 USD - $159.00 USD
    Current price $159.00 USD

    David Astro 99% Dielectric Twist-Lock Diagonal - 2"

    DAV-DIG-TL-2
    9 in stock

    The 2" 99% Dielectric Twist-Lock Diagonal is an essential upgrade for astronomers seeking the best in optical performance and convenience. This pre...

    View full details
    Original price $159.00 USD - Original price $159.00 USD
    Original price
    $159.00 USD
    $159.00 USD - $159.00 USD
    Current price $159.00 USD
  • Original price $160.00 USD - Original price $160.00 USD
    Original price
    $160.00 USD
    $160.00 USD - $160.00 USD
    Current price $160.00 USD

    Celestron Dielectric Star Diagonal with Twist-Lock - 1.25"

    CEL-93571

    Features Enjoy better views through your telescope with this premium diagonal featuring diffraction-limited optics and dielectric coatings Provides...

    View full details
    Original price $160.00 USD - Original price $160.00 USD
    Original price
    $160.00 USD
    $160.00 USD - $160.00 USD
    Current price $160.00 USD

modal overlay

modal overlay

Wishlist
wishlist emptyYou didn't like any products yet!Explore store