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Navigating Tariffs: Due to the current volatile tariff environment and associated logistics challenges, O'Telescope is unable to fulfill shipments to the United States. Orders submitted with a U.S. shipping address will be refunded, with the payment gateway transaction fee deducted. This restriction does not affect BackyardEOS or BackyardNIKON, which remain available as digital downloads.
Inventory closeout sale, everything must go. Up to 35% off. Some conditions apply.
We are closing our inventory side of the business and focusing solely on software - going back to our roots so to speak. No store coupons required, all prices have been marked down. First come, first served, until quantities last. We are no longer placing orders with manufacturers. Absolutely no rain checks. We reserve the right to cancel and refund orders at our sole discretion. We do our best to maintain our inventory accurate, but mistakes do happen, if you purchase an item that is no longer in stock, you will be refunded. The sale does not apply to some higher-end items such as 10Micron. Prices subject to change without notice. ALL SALES ARE FINAL.
Occasionally, we find a box under a box under a box in the back of the warehouse with hidden treasures, and when we do, we add these items on the site, so even though you may not find what you're looking for today, it could automagically appear next week.
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Focusing & Bahtinov Masks
2 products
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![Fits 2-1/2''-5-1/2'' 63mm-139mm. Aluminum full aperture Bahtinov focusing screen. [AZ-501]](https://www.otelescope.com/uploads/store-AZ-501.jpg)
Fits 2-1/2''-5-1/2'' 63mm-139mm. Aluminum full aperture Bahtinov focusing screen. [AZ-501]
$45.52 CAD$60.69 CAD4 in stock On saleBack Order / Waiting ListAstrozap: Lightweight full aperture aluminum focusing mask with adjustable grommets for telescopes that have an outside diameters of between 2.5" and 5.5" (63 mm to 139 mm). Thin construction enables ideal performance.
Imagers as well as observers know that to make the most of their valuable telescope time, sharp focus is crucial. In terms of popularity, the Bahtinov-style mask has recently surpassed the Hartmann mask because of its novel diffraction pattern display which enables higher accuracy in determining the optimal focus point. For dark side imagers, where achieving the finest images is reliant upon camera focusing, the Bahtinov mask simplifies the process of finding the ideal focus point so you don't have to estimate anymore. Additionally, quick adjustments can be made when exchanging filters or fixing focus as your imaging session progresses through the night. For light side observers, the Bahtinov mask provides quicker, higher precision focusing, even when switching eyepieces.
Proudly manufactured in the USA, Astrozap Bahtinov Focusing Masks consist of solid sheet aluminum, making them a great deal more durable than their plastic counterparts available elsewhere. They are powder coated for corrosion resistance and to keep their attractive look. Astrozap has focusing screens that fit telescopes in all the most common sizes with adjustable plastic screws mounted in rubber grommets that help fit it in place without scratching or causing damage to the outside of the optical tube. Ideal focus is achieved time after time with the Bahtinov Focusing Mask's unique diffraction pattern. -
![Fits 5-1/2"-8-1/2'' 139mm-216mm. Aluminum full aperture Bahtinov focusing screen [AZ-502]](https://www.otelescope.com/uploads/store-AZ-502.jpg)
Fits 5-1/2"-8-1/2'' 139mm-216mm. Aluminum full aperture Bahtinov focusing screen [AZ-502]
$49.96 CAD$66.61 CAD8 in stock On saleBack Order / Waiting ListAstrozap: This Astrozap Focusing Screen is a lightweight aluminum focusing screen with adjustable grommets.
Fits telescopes with outside diameters of 5-1/2''-8-1/2'' (139mm-216mm). The thin design allows for optimal performance. Precision grid pattern allows for perfect focus every time. Quick and easy to attach to your telescope.
