How to Focus A Telescope Correctly?

Best Telescope Accessories to Buy in October 2025

1

Celestron Accessory Kit with Five 1.25" Plossl Eyepieces, 2X Barlow and Filter Set

• COMPLETE KIT AMPLIFIES VIEWING WITH 5 EYEPIECES AND A BARLOW LENS.
• EXPLORE PLANETS WITH INCLUDED COLORED FILTERS FOR ENHANCED DETAILS.
• STURDY, PROTECTIVE CASE KEEPS ACCESSORIES ORGANIZED AND READY TO USE.

BUY & SAVE

$209.99 $239.95

Save 12%

2

Celestron AstroMaster 8-Piece Eyepiece & Filter Accessory Kit - Includes Two 1.25” Eyepieces, 2X Barlow Lens, Three Filters, Cleaning Cloth and Hard Case Black

• BOOST YOUR VIEWING EXPERIENCE WITH ESSENTIAL EIGHT-PIECE KIT!
• CAPTURE STUNNING IMAGES BY ATTACHING YOUR DSLR CAMERA EASILY!
• ENJOY PEACE OF MIND WITH A 2-YEAR WARRANTY AND EXPERT SUPPORT!

BUY & SAVE

$57.79 $89.95

Save 36%

3

Celestron - Zoom Eyepiece for Telescope - Versatile 8mm-24mm Zoom for Low Power and High Power Viewing - Works with Any Telescope That Accepts 1.25" Eyepieces

• INSTANT MAGNIFICATION: ZOOM FROM 8MM TO 24MM EFFORTLESSLY!
• ONE EYEPIECE, ENDLESS OPTIONS: SAVE MONEY AND HASSLE WHILE STARGAZING.
• COMPATIBLE WITH ALL 1.25 TELESCOPES: EASY USE WITH ANY SETUP!

BUY & SAVE

$79.79 $107.95

Save 26%

4

Starboosa Complete Telescope Eyepiece Set - Multi-Coated Optics - 1.25 inch Eyepiece Set with 4mm, 10mm, 20mm Lenses, 5X Barlow Lens, 2 Moon Filters, 2 Polarizing Filters

• VERSATILE EYEPIECE SET ENHANCES VIEWING FOR ALL SKILL LEVELS.
• HIGH-QUALITY FILTERS IMPROVE CLARITY AND REDUCE GLARE EFFECTIVELY.
• COMFORTABLE SOFT EYECUPS ENSURE ENJOYABLE, EXTENDED VIEWING SESSIONS.

BUY & SAVE

$61.59

5

Celestron - SkyPortal WiFi Module - Control Your Celestron Computerized Telescope via Smartphone - Telescope Wi-Fi Accessory

• EFFORTLESSLY CONTROL YOUR TELESCOPE VIA SMARTPHONE WITH SKYPORTAL APP.
• INSTANT OBJECT IDENTIFICATION; CENTER CELESTIAL WONDERS WITH A TAP!
• EXPLORE 100,000+ OBJECTS, PLUS ENJOY AUDIO AND ASTROIMAGES WHILE VIEWING.

BUY & SAVE

$129.99 $143.95

Save 10%

6

Gskyer Telescope, 70mm Aperture 400mm AZ Mount Astronomical Refracting Telescope for Kids Beginners - Travel Telescope with Carry Bag, Phone Adapter and Wireless Remote.

• STUNNING IMAGES WITH SUPERIOR OPTICS: 400MM FOCAL LENGTH, 70MM APERTURE.

• TRIPLE MAGNIFICATION: INCLUDES 2 EYEPIECES AND 3X BARLOW LENS.

• EXPLORE EASILY: WIRELESS REMOTE AND SMARTPHONE ADAPTER FOR CONVENIENCE.

BUY & SAVE

$78.25 $129.99

Save 40%

+

ONE MORE?

To focus a telescope correctly, you first need to locate a bright object in the sky, such as a star or planet. Begin by adjusting the focus knob on the telescope until the object appears sharp and clear. If the image is still blurry, try adjusting the focus knob in the opposite direction. Keep making small adjustments until the object is in sharp focus. It may take some practice and patience to get the focus just right, but once you do, you will be able to enjoy clear and detailed views of celestial objects through your telescope.

What is the importance of focusing a telescope before use?

Focusing a telescope is important for several reasons:

1. Clarity: Focusing allows the user to achieve maximum clarity and sharpness in the image being observed. Without proper focus, the image may appear blurry or unclear.
2. Detail: Focusing allows the user to see fine details and features in the object being observed. This is especially important when observing celestial objects such as planets, stars, and galaxies.
3. Magnification: Proper focus is essential for achieving the desired magnification level. Without proper focus, the image may appear distorted or enlarged beyond recognition.
4. Comfort: Focusing the telescope ensures that the user can view the object comfortably without straining their eyes or experiencing discomfort.

Overall, focusing a telescope is essential for maximizing the viewing experience and making the most of the telescope's capabilities.

How to ensure the lens or mirror is clean before focusing a telescope?

1. Use a soft, lint-free cloth to gently wipe the lens or mirror. Avoid using tissue paper or rough fabric, as they can scratch the surface.
2. Use a specialized lens cleaning solution or optical lens cleaner to remove any stubborn dirt or smudges. Do not use household cleaners or water, as they can damage the coating on the lens.
3. Blow any dust or debris off the lens with a can of compressed air or a bulb blower before wiping it with a cloth.
4. Check the lens or mirror under a bright light to ensure there are no streaks or smudges left behind after cleaning.
5. Repeat the cleaning process if necessary until the lens or mirror is completely clean and free of any dirt or smudges.

How to use a Bahtinov mask to achieve precise focus with a telescope?

1. Attach the Bahtinov mask to the front of your telescope. The mask should have three sets of angled slots that create a unique pattern.
2. Point your telescope at a bright star or other bright object in the sky.
3. Look through the eyepiece and adjust the focus until the star appears as a small point of light.
4. Rotate the Bahtinov mask so that the slots are at a 45-degree angle to the star's rays.
5. As you adjust the focus, you will notice that the diffraction spikes created by the mask will intersect at a central point. This central point is where the telescope is in perfect focus.
6. Fine-tune the focus by adjusting the focus knob until the diffraction spikes are perfectly aligned and converging at the central point.
7. Once the diffraction spikes are perfectly aligned, your telescope is in precise focus and ready for astrophotography or visual observing.
8. Remember to remove the Bahtinov mask before continuing with your observation or photography session.