Telescope Diagonals & Prisms

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Celestron 90° Dielectric Star Diagonal with Twist-Lock (2")

Celestron 90° Dielectric Star Diagonal with Twist-Lock (2")

B&H # CEDSDTL2 MFR # 93573
Key Features
  • 2" Eyepiece Holder with 1.25" Reducer
  • Adapter for Connection to SCT Backs
  • BK7 Glass, Diffraction-Limited Optics
  • 58-Layer Dielectric Coatings
$19999
In Stock
Celestron 90° Dielectric Star Diagonal with Twist-Lock (1.25")

Celestron 90° Dielectric Star Diagonal with Twist-Lock (1.25")

B&H # CEDSDTL125 MFR # 93571
Key Features
  • 1.25" Nose Piece and Holder
  • BK7 Glass, Diffraction-Limited Optics
  • 58-Layer Dielectric Coatings
  • Over 99% Reflective Mirror Surfaces
$14495
In Stock

iOptron 90° Dielectric Star Diagonal (1.25")

B&H # IO6231 MFR # 6231
Key Features
  • Ideal for Refractor or Catadioptric OTAs
  • 1.25" Diameter Barrel
  • Dielectric-Coated BK-7 Glass Mirror
  • 99% Reflective Surface Mirror
$7900
In Stock

Celestron 90° Star Diagonal (1.25")

B&H # CEDS1.25 MFR # 94115-A
Key Features
  • 90° Angle
  • Upright & Laterally-Reversed Observing
$5195
In Stock

Celestron 45-Degree Erect Diagonal (1.25")

B&H # CEDEI451.25 MFR # 94112-A
Key Features
  • Upright & Laterally-Correct Observing
$4999
In Stock

Explore Scientific 2" ES Star Diagonal

B&H # EXDD0200CF MFR # DD02-00CF
Key Features
  • 2" Diameter Barrel
  • 1.25" Eyepiece Adapter
  • Dielectric-Coated Mirror
  • 99% Reflective Surface Mirror
$19999
In Stock

Tele Vue Everbrite 90° Star Diagonal Schmidt-Cassegrain Kit (2")

B&H # TESCP8202 MFR # SCP-8202
Key Features
  • 2" Barrel and Eyepiece Holder
  • 99% Reflective Everbrite Mirror Coatings
  • Broadband Reflectivity for Natural Color
  • Pyrex Optical Glass Mirror
$40900
In Stock

Alpine Astronomical Baader 45° Erecting Amici Prism for Maxbright Binoviewer (1.25")

B&H # ALMAXAMICI MFR # MAXAMICI
Key Features
  • Corrects View for Terrestrial Use
  • Anti-Reflection Multi-Coated Optics
  • Total Reflection Prism Coatings
  • Integrated 2x Glasspath Corrector
$12200
Special Order
Expected availability: 2-4 weeks

Celestron 90-Degree Mirror Diagonal (2") for SCT Scopes

B&H # CEDM2S MFR # 93527
Key Features
  • Upright, Laterally-Reversed Images
  • Fits Catadioptric 2"-18 Rear Threads
  • Starbright XLT Coatings
$17495
In Stock

Tele Vue 90-Degree Everbrite Mirror Diagonal (1.25")

B&H # TE190E MFR # DPC-1250
Key Features
  • Upright, Laterally-Reversed Images
$28500
In Stock

Alpine Astronomical Baader T-2 BBHS Sitall Mirror Diagonal Star Diagonal (1.25")

B&H # ALMAX1S MFR # MAX-1S
Key Features
  • Part of the T-2 Astro Modular System
  • Broadband Hard Silver Coated
  • Opitmized for 390-2000nm Spectral Range
  • Sitall Glass-Ceramic Mirror
$29900
Special Order
Expected availability: 2-4 weeks

Tele Vue 2" Enhanced Aluminum Diagonal with Hi-Hat Reducer Adapter

B&H # TEDEP8003 MFR # DEP-8003
Key Features
  • 2" Diameter Barrel
  • 2-to-1.25" Eyepiece Reducer Adapter
  • 96% Reflective Mirror Surface
  • Top-Layer Protective Mirror Coating
$30500
In Stock

Alpine Astronomical Baader 2" ClickLock BBHS Star Prism Diagonal

B&H # ALPRISM2Z MFR # PRISM-2Z
Key Features
  • BAK4 Prism Glass
  • Phantom Group Multi-Coated
  • Broadband Hard-Silver (BBHS) Coated
  • Optimized for 390-2000nm Spectral Range
$51900
Special Order
Expected availability: 2-4 weeks

Alpine Astronomical Baader 2" 90° Deluxe Astro Amici Erecting Diagonal

B&H # ALAMICIDX2 MFR # AMICI-DX2
Key Features
  • Amici Erect-Image Diagonal
  • Broadband BBHS Internal Mirror Coatings
  • Anti-Reflection Phantom Group Coatings
  • Horizontal/Vertical Corrected Views
$71900
Special Order
Expected availability: 2-4 weeks

iOptron 45° Erect-Image Diagonal (1.25")

B&H # IOTDE100 MFR # TDE100
Key Features
  • 1.25" Barrel Diameter
  • Corrects Image for Terrestrial Viewing
$2500
Special Order
Expected availability: 2-4 weeks

Vixen Optics 90-Degree Prism Diagonal (1.25")

B&H # VIDP MFR # ES3675
Key Features
  • Erect, Laterally-Reversed Images
$7495
Special Order
Expected availability: 7-14 business days

Alpine Astronomical Baader 1.25" 45° Amici Erecting Diagonal

B&H # ALAMICI45 MFR # AMICI-45
Key Features
  • 1.25" Holder and Nosepiece
  • Anti-Reflection Multi-Coatings
  • Large 24mm Clear Aperture
  • Standard 1.25" Eyepiece Filter Threads
$9200
Special Order
Expected availability: 2-4 weeks

Snypex 45-degree Erect Image Roof Prism for the Knight PT Digiscope

B&H # SN45EIRP MFR # SNY PT72-45AA
Key Features
  • For the Knight PT 72mm-ED-APO Digiscope
  • Accepts 1.25" Eyepieces and Accessories
$9999
In Stock

Lumicon 90-Degree Enhanced Mirror Diagonal (1.25")

B&H # LU125ED MFR # LD1010
Key Features
  • Upright, Laterally-Reversed Images
$11995
Special Order
Expected availability: 2-4 weeks

Alpine Astronomical Baader T-2 90° Prism Star Diagonal Housing

B&H # ALT201C MFR # T2-01C
Key Features
  • Part of the Astro T-2 Modular System
  • 32mm Clear Mirror Aperture
  • T2 Male and T2 Female Threads
  • Highly Reflective Mirror Coatings
$14100
Special Order
Expected availability: 2-4 weeks

iOptron 90° Dielectric Star Diagonal (2")

B&H # IO6232 MFR # 6232
Key Features
  • Ideal for Refractor or Catadioptric OTAs
  • Large 2" Diameter Barrel
  • 1.25" Reducer Adapter Included
  • Dielectric-Coated BK-7 Glass Mirror
$14800
Special Order
Expected availability: 7-14 business days

Vixen Optics Flip Mirror System

B&H # VIFM MFR # ES2680
Key Features
  • Inserts in 2" Focusers
  • Accepts 1.25" Eyepieces
  • Accepts T-Mounts
$14995
Special Order
Expected availability: 7-14 business days

Alpine Astronomical Baader Zenith Prism Star Diagonal (1.25")

B&H # ALPRISM1 MFR # PRISM-1
Key Features
  • Baader Deluxe 1.25"/T-2 Eyepiece Holder
  • Tight Fit for Accurate Optical Alignment
  • Bronze Compression Ring, 3 Set Screws
  • Locking Micro-Focusing Mechanism
$16900
Back-Ordered

Tele Vue 90° Enhanced Aluminum Star Diagonal (1.25")

B&H # TE190D MFR # DSC-0125
Key Features
  • 1.25" Diameter Barrel
  • 96% Reflective Mirror Surface
  • Top-Layer Protective Mirror Coating
  • Non-Marking Brass Clamp Ring
$18900
Special Order
Expected availability: 2-4 weeks

Alpine Astronomical Baader 2" 45° Amici Erecting Diagonal

B&H # ALAMICI452 MFR # AMICI-45-2
Key Features
  • 2" Holder and SCT Mount Threads
  • 1.25" Eyepiece Reducer Adapter
  • Anti-Reflection Multi-Coatings
  • Not Recommended for High Magnifications
$23900
In Stock

Alpine Astronomical Baader 90° T-2 Star Diagonal Prism

B&H # ALT201B MFR # T2-01B
Key Features
  • BAK4 Prism Glass
  • Phantom Group Multi-Coated
  • Broadband Hard-Silver (BBHS) Coated
  • Male T-2 Threads, Female T-2 Threads
$24900
Special Order
Expected availability: 2-4 weeks

Alpine Astronomical Baader T-2 Maxbright Sitall Mirror Star Diagonal (1.25")

B&H # ALMAX1 MFR # MAX-1
Key Features
  • Part of the T-2 Astro Modular System
  • Accepts 1.25" T-2 Accessories
  • Dielectrically Coated, 99% Reflective
  • High Thermal Stability Mirror
$24900
Special Order
Expected availability: 2-4 weeks

Alpine Astronomical Baader FlipMirror II Star Diagonal

B&H # ALBFMII MFR # BFM-II
Key Features
  • Essential for Accurate Astrophotography
  • Three Ports for Cameras & Accessories
  • Multi-Layer Aluminum-Coated Flip Mirror
  • Precise Adjustments for All Light Paths
$27200
Temporarily Out of Stock

Alpine Astronomical Baader 2" 90° Amici Erecting Diagonal

B&H # ALAMICI2 MFR # AMICI-2
Key Features
  • 2" Holder and Nosepiece
  • 1.25" Eyepiece Reducer Adapter
  • 7-Layer Anti-Reflection Multi-Coatings
  • Large 38mm Clear Aperture
$29900
Special Order
Expected availability: 2-4 weeks

Alpine Astronomical Baader ClickLock Mirror Star Diagonal (2")

B&H # ALCLDIAG2 MFR # CLDIAG-2
Key Features
  • 2" Nosepiece & ClickLock Eyepiece Clamp
  • Dielectric-Coated Mirror
  • 99% Reflective Surface Mirror
  • Thermally Stable - Resists Heat
$30900
Temporarily Out of Stock

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