Telescope F Ratios

A primer on telescope F ratios will be the subject this week on the Sky-Watcher What’s Up? Webcast.

Telescope F RatiosThe Sky-Watcher team will take a look at F/ratios and understanding their function when it comes to telescopes as well as dive into how F/ Ratios affect visual as well as photography.

The “F” ratio is the ‘speed’ of a telescope’s optics. The can be calculated by dividing the focal length by the aperture. The smaller the F/number, the lower the magnification, the wider the field, and the brighter the image with any given eyepiece or camera.

And yes, it helps to understand “F” ratios for solar telescopes. The concept is the same day or night, dedicated solar telescopes have a focal length and aperture, and these concepts matter when choosing a solar telescope.

The Sky-Watcher What’s Up? Webcast is a live webcast held every Friday from 10am to 11am Pacific on the Sky-Watcher USA YouTube channel. Each week they discuss a new astronomical topic including gear, visual and imaging techniques, interviews and more.

What’s Up? webcasts are free by tuning into the Sky-Watcher USA YouTube channel. Can’t watch the webcast live? That’s OK, all webcasts can be watched whenever you like by visiting the YouTube channel.

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