About Focalyard

Focalyard works out what a telescope and an eyepiece will show before you buy either. A 25 mm eyepiece in a 1200 mm telescope gives 48x.

The pages are for someone who already has a tube, or is about to choose one, and wants the magnification, the field, and the aperture in the same units the spec sheet uses.

A 10 mm eyepiece in a 700 mm tube gives 70x. On a 70 mm lens the ceiling is about 140x, and 70x stays under it.

Owen Carraway is the house pen name of the Focalyard editors. Articles are drafted with AI assistance and every number is checked against the formula or the manufacturer's spec sheet.

The name is shared by the editors. Read the author page for the byline.

Maker rows are copied from the maker's spec page, with the date that page was opened. Aperture, focal length, focal ratio, weight, and focuser size come from that page, not from the front of the box.

The formulas sit on How we research. The editing rules sit on the editorial policy. A correction goes to contact.

The magnification calculator and the eyepiece calculator use those formulas. Type 1200 mm and 25 mm and you should see 48x.

Aperture pages say what a given size can show from a suburban sky and from a dark sky. Gear rows group models by the spec sheet. None of those pages prints a price or a star rating. If you already know the focal length in millimetres, start with the calculator.

The author page explains the shared pen name. The privacy page names Google Analytics 4, Umami, the Cloudflare logs, and what an Amazon link can set in the browser. The footer on every page says that Focalyard earns from qualifying purchases, using those same words on the site.