We believe in sharing real advice and knowledge. Whether you are a beginner, amateur or pro astronomer, our goal is to help you get the right equipment to meet your budget and your goals. We strive to help foster your passion for astronomy because we want you to enjoy the hobby as much as we do!

Ontario Telescope and Accessories is an online and in-person destination for hobbyists and astronomers that are looking for new equipment. Proud authorized dealer for iOptron, Celestron, Skywatcher, Optolong, Antlia, IDAS, QHYCCD, Diffraction Limited, Explore Scientific, Pegasus Astro, ZWQ Antares, and other high-quality manufacturers. Offering shipping across Canada, the United States, and beyond with personalized service to ensure customer satisfaction. Shop for your equipment 24 hours a day from the comfort of your own home or come visit us in-person at our Bolton, Ontario location.

Ontario Telescope and Accessories, where OTA means more.

Our hours are:

Monday

12:00pm to 5:00pm

Tuesday - Friday

10:00am to 5:00pm

Saturday

10:30am to 3:00pm

Sunday

Closed

Email Us at:

sales@ontariotelescope.com
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Recent Blog Posts

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Guide scope or off-axis guider: a PHD2 guide graph reporting 0.41 arcsecond RMS beside elongated stars from the same night

Your Guide Graph Is Lying to You

astrophotography Stephen Mallia
You drove ninety minutes to dark sky, PHD2 held 0.4 arcseconds all night, and half your subs still have eggs for stars. Here are the three things your

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V-size Vixen and D-size Losmandy dovetail bar profiles compared to scale, about 44 mm against 75 to 84 mm

D-Size vs V-Size: A Complete Guide to Telescope Dovetail Systems

Stephen Mallia
What's the difference between D-size and V-size telescope dovetails? Here's everything you need to know.

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A 55 mm back focus imaging train: spacer 16.5 mm, filter drawer 21 mm and camera sensor depth 17.5 mm, measured from the rear of the reducer

What Is Back Focus in Astrophotography? Telescope Reducers, Flatteners, and Spacing Explained

Stephen Mallia
What Is Back Focus in Astrophotography? Telescope Reducers, Flatteners, and Spacing Explained Back focus is one of those astrophotography terms that c

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