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Astronomers often need to calculate the magnification derived from their telescope focal length and eyepiece. Magna Calc provides an easy way to calculate this value for both amateur and professional astronomers.

Additionally, Magna Calc provides a 2x and 3x Barlow lens option.

Whether you're an amateur or professional astronomer, you'll find Magna Calc useful in your everyday passion for astronomy.

Magna Calc Features...

- Telescope Focal Length (in Millimeters)
- Eyepiece Focal Length (in Millimeters)
- Barlow Lens Option (None, 2x, 3x)
- Magnification Calculation

What’s New

Version 2.1

Minor bug fixes

Ratings and Reviews

1.5 out of 5
2 Ratings

2 Ratings

SteveG12436 ,

Not really happy with it

Its simple and the key pad is a good idea. But this calculator requires you know your f ratio in millimeters. I can figure that out, but I think a good calculator should not require you provide some of the calculating yourself. Any scope owner would know their mirror size in inches and focal length f ratio, calculating from those figures would be more useful.

Tiger8254 ,


Don't waste your dollar. If you've updated your phone since 2011, then the app will not even open. Shame on the developer for not keeping the app updated, and shame on Apple for not removing the app from the App Store. If I could I'd rate this app -5 stars.

App Privacy

The developer, Greg Paskal, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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