JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser.

We use cookies and similar technologies to improve your experience, analyze traffic, and support our marketing efforts. Information may be collected by our analytics and advertising partners. By accepting cookies or continuing to the Site, you consent to cookies and information use under our Cookie Policy & Privacy Policy.

Skip to Content

Shop

Telescopes

Telescopes View All

Popular Telescopes

Popular Telescopes View All

Smart Telescopes

Beginner Telescopes

Astrophotography Telescopes

Refractor Telescopes

Dobsonian Telescopes

Refractor Telescopes

Refractor Telescopes View All

Petzval Telescopes

Triplet Telescopes

Doublet Telescopes

Reflector Telescopes

Reflector Telescopes View All

Dobsonian Telescopes

Newtonian Telescopes

Ritchey-Chretien Telescopes

Cassegrain Telescopes

Catadioptric Telescopes

Catadioptric Telescopes View All

RASA Telescopes

Maksutov Telescopes

More Telescopes

More Telescopes View All

Smart Telescopes

Solar Telescopes

Computerized Telescopes

Astrograph Telescopes

Spotting Telescopes

Telescope Bundles

Kids Telescopes

Astrophotography

Astrophotography View All

Cameras

Cameras View All

Deep Sky Cameras

Planetary Cameras

Mounts

Mounts View All

Harmonic EQ Mounts

Classic GoTo EQ Mounts

Counterweights & Balancing

Filters

Filters View All

Light Pollution Filters

Narrowband Filters

Broadband Filters

Planetary Filters

Specialty Filters

Optical Correctors

Optical Correctors View All

Field Flatteners

Coma Correctors

Barlows & Extenders

Imaging Accessories

Imaging Accessories View All

Smart Controllers

Guide Scopes & OAGs

Autofocusers & Focus Aids

Filter Drawers & Wheels

Camera Rotators

Adapters & Spacers

Collimation Tools

Smartphone Adapters

Mounts

Mounts View All

Equatorial Mounts

Equatorial Mounts View All

Harmonic EQ Mounts

Classic GoTo EQ Mounts

Alt-Azimuth Mounts

Alt-Azimuth Mounts View All

GoTo Alt-Az Mounts

Manual Alt-Az Mounts

Mount Accessories

Mount Accessories View All

Telescope Tripods

Counterweights & Balancing

Dovetail Saddles & Clamps

Polar Scopes & Tools

Equatorial Wedges

Hand Controllers & Electronics

Screws, Knobs, & Hardware

Vibration Suppression

Miscellaneous Mount Accessories

Mounting Hardware & Solutions

Mounting Hardware & Solutions View All

Dovetail Bars/Rails

Dovetail Clamps

Hybrid Mounting Solutions

Solar

Solar Telescopes

Solar Telescopes View All

H-Alpha Telescopes

White Light Telescopes

Solar Filters

Solar Filters View All

Solar Film Sheets

Ready-to-Use Telescope Solar Filters

Other Polymer Film Filters

Camera Lens Solar Filters

Herschel Wedges

H-Alpha Filters

Calcium H & K Filters

Other Specialty Filters

Solar Binoculars

Solar Accessories

Solar Accessories View All

Solar Glasses & Viewers

Eyepieces & Barlows

Miscellaneous Accessories

Accessories

Accessories View All

Telescope Accessories

Telescope Accessories View All

Field Flatteners

Coma Correctors

Barlows & Extenders

Telescope Focusers

Focuser Accessories

Dew Prevention & Control

Finder & Guide Scope Accessories

Diagonals & Prisms

Smart Telescope Accessories

Eyepieces

Eyepieces View All

1.25" Eyepieces

Specialty Eyepieces

Imaging Eyepieces

Adapters

Adapters View All

0.965" Adapters

M54 Threaded Adapters

Baader UFC Adapters

Binocular Adapters

Camera / Imaging Adapters

Dust Covers / Seals

Eyepiece Adapters

Extension Tubes

Gender Changers

SCT Thread Adapters

Spacer Rings / Extenders

T-Thread Adapters

Webcam & Video Adapters

Miscellaneous Adapters

Binoculars & Accessories

Binoculars & Accessories View All

Standard Binoculars (Up to 50mm)

Large Binoculars (56mm-90mm)

Giant Binoculars (100mm & Larger)

Solar Binoculars

Binocular Accessories

More Accessories

More Accessories View All

Lights & Laser Pointers

Maps, Books & Software

Cleaning Supplies

Agena Astro Apparel & Merchandise

Miscellaneous Accessories

Power Adapters, Cables & Batteries

Dust Covers & Seals

Mirrors & Holders

Smart Telescope Accessories

Accessory Packages

Sale

Shop Sales

Shop Sales View All

Celestron EdgeHD Sale

Thousand Oaks Dew Heater Sale

William Optics Promotions

ZWO FF Refractor Sale

PrimaLuceLab ESATTO Sale

Vaonis Back to School Sale

Shop Clearance

Shop Clearance View All

Clearance Telescopes

Clearance Astrophotography

Clearance Mounts

Clearance Solar

Clearance Accessories

Brands

Baader Planetarium

AstroSuite ^NEW

Contact Us
Shipping FAQ
Returns & Exchanges
Help Center

Compare Products item items

Sign In Create an Account

Telescopes
Astrophotography
Mounts
Solar
Accessories
Sale
- Shop Sales
  
  Celestron EdgeHD Sale
  
  Thousand Oaks Dew Heater Sale
  
  ToupTek Sale
  
  William Optics Promotions
  
  ZWO FF Refractor Sale
  
  View All
- Shop Clearance
  
  Clearance Telescopes
  
  Clearance Astrophotography
  
  Clearance Mounts
  
  Clearance Solar
  
  Clearance Accessories

AstroSuite ^NEW

Brands

Featured Brands

Over 30k 5-star reviews
Free shipping over $50*
Easy 30-day returns

Shopping Cart

Loading...

2" Diagonals & Prisms

Sort by:

FILTER BY

Price

$

to

$

Stock

In Stock (28) items

Out of Stock (10) items

Manufacturer

Search

Askar (1) item

Baader Planetarium (10) items

Celestron (2) items

Explore Scientific (1) item

Founder Optics (1) item

GSO (8) items

iOptron (1) item

Long Perng (3) items

Lunt Solar Systems (3) items

Pegasus Astro (2) items

Tele Vue (2) items

William Optics (4) items

Category

1.25" Diagonals & Prisms 1.25" Diagonals & Prisms (31) items

2" Diagonals & Prisms 2" Diagonals & Prisms (38) items

Erect Image Diagonals Erect Image Diagonals (23) items

Hybrid Diagonals & Prisms Hybrid Diagonals & Prisms (3) items

T / T2 Threaded Diagonals T / T2 Threaded Diagonals (7) items

SCT Diagonals SCT Diagonals (14) items

Customer Reviews

(12) items

& up (26) items

& up (26) items

Product Banner Type

coming-soon (4) items

new (32) items

Adapter Specifications

2" Nosepiece (2) items

M48 (2" Filter) Thread - Male (2) items

M48 (2" Filter) Thread - Female (1) item

SCT Thread - Male (2) items

SCT Thread - Female (3) items

Accessory Size

2 inch (25) items

Sort by:

SCT Barrel from 2" GSO SCT Diagonals

$27.95

In Stock
Explore Scientific 99% Dielectric 2" Diagonal

$219.99

Out of Stock

Out of Stock
Baader 2" 45° Erecting Amici Prism SCT Diagonal with 1.25" Adapter

$268.00

In Stock
Long Perng 2" 45° Erecting Amici Prism SCT Diagonal with 1.25" Adapter

$199.00

In Stock
Coming Soon

Lunt Calcium K 2" B1800 Star Diagonal Filter with T2 Connection

$1,695.00

Out of Stock

Back-order
Coming Soon

Pegasus Astro 2" Orbit Rotating Mirror Diagonal for SCT Telescopes

$205.70

Out of Stock

Out of Stock
Lunt Calcium K 2" B600 Star Diagonal Filter with T2 Connection

$795.00

Out of Stock

Out of Stock
iOptron 2" Dielectric Mirror Star Diagonal

$148.00

In Stock
Coming Soon

Lunt Calcium K 2" B1200 Star Diagonal Filter with T2 Connection

$1,495.00

Out of Stock

Back-order
Coming Soon

Pegasus Astro Orbit Rotating Mirror Diagonal for EdgeHD Telescopes

$342.10

Out of Stock

Out of Stock
Long Perng 2" 45° Erecting Amici Prism Refractor Diagonal with 1.25" Adapter

$189.00

Out of Stock

Out of Stock
GSO 2" 90-deg Mirror Diagonal for SCTs

$80.00

Out of Stock

Out of Stock
Long Perng 2" 90º Correct Image Amici Prism Diagonal

$235.00

Out of Stock

Out of Stock
GSO 2" 90-deg Mirror Diagonal for Refractors

$80.00

Out of Stock

Out of Stock

Items 25-38 of 38

Page 1
You're currently reading page 2

Show:

24
48
72

Free Shipping

on orders over $50*

Easy Returns

from day of receipt

Live Inventory

for all products

Sign up for Agena Astro emails

Be first to know about sales, new astro gear & events

CONTACT

[email protected]

* Not A Retail Store *

13100 Alondra Blvd, Suite 106
Cerritos, CA 90703, USA

ACCOUNT

Log in
Create Account
Order Status
Order History
Wishlist

SUPPORT

Contact Us
Ordering FAQ
Shipping & Delivery
Returns & Exchanges
International Orders
Coupons & Discounts

RESOURCES

Agena Academy
Affiliate Program
Site Map
Discontinued Products

WHO WE ARE

About Us
Job Openings
Customer Reviews
Media Kit

Copyright © 2003-2026 Agena Astro. All rights reserved.

Terms of Use
Privacy Policy
Cookie Policy

Manage Cookie Preferences