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

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

Solar Telescopes

Computerized Telescopes

Astrograph Telescopes

Spotting Telescopes

Telescope Bundles

Smart Telescopes

Astrophotography

Astrophotography View All

Cameras

Cameras View All

Deep Sky Cameras

Planetary Cameras

Mounts

Filters

Filters View All

Light Pollution Filters

Narrowband Filters

Planetary Filters

Specialty Filters

Color Correction & Minus Violet Filters

ND & Polarizing Filters

Skylight & Protective Filters

Optical Correctors

Imaging Accessories

Imaging Accessories View All

Filter Drawers & Wheels

Camera Rotators

Adapters & Spacers

Collimation & Focusing Tools

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

Telescope Mounts

Telescope Mounts View All

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 Binoculars

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 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

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

Clearance

Clearance View All

Cameras

Eyepieces

Optical Accessories

Parts & Accessories

Telescopes

Binoculars

Sales & Special Offers

Sales & Special Offers View All

Celestron C-Suite EQ Promo

iOptron Mount Closeout Special Offer

Sky Watcher Mount Madness Sale

Sky-Watcher Refractor Sale

Contact/Visit Us
Shipping FAQ
Return Policy
Rewards Program
Privacy Policy
Customer Experience
Help

Compare Products item items

Sign In Create an Account

Telescopes
Astrophotography
Mounts
Solar
Accessories
Clearance
- Cameras Eyepieces Optical Accessories Parts & Accessories Telescopes Binoculars
Sales & Special Offers
- Celestron C-Suite EQ Promo iOptron Mount Closeout Special Offer Sky Watcher Mount Madness Sale Sky-Watcher Refractor Sale

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

Shopping Cart

Loading...

Accessories

Category Telescope Accessories image

Telescope Accessories

Category Eyepieces image

Category Adapters image

Category Binoculars & Accessories image

Binoculars & Accessories

Category More Accessories image

More Accessories

Category All Optical Accessories image

All Optical Accessories

Filters (1)

William Optics SWAN

Clear All

Sort by:

FILTER BY

Stock

In Stock (1) item

Eyepiece Series

Agena Dual ED (7) items
Agena EWA (5) items
Agena SWA (9) items
Agena WA (4) items
Baader Aspheric (2) items
Baader Classic Ortho/Plossl (12) items
Baader Hyperion (10) items
Baader Morpheus (7) items
Brandon Ocular (14) items
BST Flat Field (5) items
BST UWA Planetary (12) items
Celestron E-Lux (1) item
Celestron Luminos (6) items
Celestron Omni (8) items
Celestron Ultima Edge (5) items
Celestron X-Cel LX (7) items
Coronado Cemax (1) item
Explore Scientific 52° (9) items
Explore Scientific 62° (7) items
Explore Scientific 68° (6) items
Explore Scientific 82° (8) items
Explore Scientific 92° LE (2) items
Explore Scientific 100° (6) items
Explore Scientific 120° (1) item
GSO CPL (4) items
GSO Plossl (9) items
GSO SuperView (8) items
Houdini Coma Correcting (3) items
KK Fujiyama HD Ortho (9) items
L-O-A 3D Eyepiece (4) items
Long Perng 55º LER (6) items
Long Perng 80º WA (3) items
Long Perng RPL Ortho (5) items
Masuyama 46°-53° (13) items
Masuyama 85° (5) items
Meade 5000 UHD (1) item
Nikon NAV HW (2) items
Nikon NAV SW (5) items
Pentax SMC XF (3) items
Pentax SMC XW (11) items
Takahashi Starbase (7) items
Takahashi TOE (6) items
Takahashi TPL (7) items
Tele Vue DeLite (9) items
Tele Vue Delos (9) items
Tele Vue Ethos (8) items
Tele Vue Panoptic (5) items
Tele Vue Plossl (8) items
Tele Vue Nagler (13) items
Vixen NPL (9) items
Vixen SLV (10) items
William Optics SWAN (1) item

FILTER BY

Sort by:

William Optics 2" Swan Series Eyepiece - 40mm

$130.00

In Stock

1 Item

Show:

24
48
72

Free Shipping

on orders over $10*

30 Days 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

Affiliate Program
Agena Academy
Site Map
Discontinued Products

WHO WE ARE

About Us
Job Openings
Customer Reviews
Media Kit

Copyright © 2003-%d Agena AstroProducts. All rights reserved.

Terms of Use
Privacy Policy
Cookie Policy