# Magna Calc

> Telescope magnification calculator for astronomers. (iPhone/iPad app by Greg Paskal.)

- Source: https://appshunter.io/ios/app/magna-calc/id412428391 (this page in markdown: same URL + `.md`)
- Developer: [Greg Paskal](https://appshunter.io/developer/322758381)
- Category: Education, Utilities
- Price: $0.99
- Rating: 3.00/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 1 MB
- Languages: American English
- Released: 2011-01-03
- Data updated: 2026-08-14
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/magna-calc/id412428391/reviews.md

## What is Magna Calc?

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

Additionally, Magna Calc provides a 2x to 5x Barlow lens option.

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

Magna Calc Features...

- Telescope Focal Length (in Millimeters)
- Eyepiece Focal Length (in Millimeters)
- Barlow Lens Option (1x, thru 5x)
- Magnification Calculation

## Key features

- Telescope focal length input
- Eyepiece focal length input
- Barlow lens option (1x-5x)
- Magnification calculation
- Supports millimeters

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/magna-calc/id412428391/reviews.md

### 1/5 — Useless, just use calculator

*2026-01-07*

No way to store the information about your telescopes and eyepieces. You should be able to easily select a scope and eyepiece from your collection, and see the magnification, TFOV, and exit pupil. To have to put in the info each time is ludicrous. I’d feel taken if this free. That it’s a paid app is unforgivable.

### 5/5 — Great Updates and Improvements

*2025-07-16*

Great improvements and updates for this app. Now utilizing modern iPhone features to help astronomers.

### 1/5 — Terrible

*2016-02-20*

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.

### 2/5 — Not really happy with it

*2011-12-27*

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.

## Frequently asked questions about Magna Calc

### What is Magna Calc used for?

Magna Calc is used to calculate the magnification of a telescope based on its focal length, eyepiece focal length, and the inclusion of a Barlow lens.

### What focal lengths does Magna Calc support?

Magna Calc supports input for telescope focal length and eyepiece focal length in millimeters. It also includes options for Barlow lenses from 1x to 5x.

### Is Magna Calc suitable for beginners?

Yes, the app is designed to be an easy-to-use tool for both amateur and professional astronomers, simplifying magnification calculations.

### What devices does Magna Calc support?

Magna Calc is currently supported on iPhone devices.

### How much does Magna Calc cost?

Magna Calc is a paid application, priced at $0.99.

### How often is Magna Calc updated?

The latest version, 2.4, was updated on July 15, 2025. The app was initially released on January 3, 2011.

### What is the age rating for Magna Calc?

Magna Calc has an age rating of 4+, making it suitable for a wide range of users.

### Does Magna Calc have ads?

No, Magna Calc does not contain advertisements.

## Version history (last 5 releases)

### 2.4 — 2025-07-15

Minor bug fixes.

### 2.3 — 2025-07-14

Redeveloped from scratch with added barlow lens settings.

### 2.2 — 2022-05-30

Bug fixes

### 2.1 — 2019-04-07

Minor bug fixes

### 2.0 — 2016-03-29

- Updated to support the latest iPhones and IOS.
- Other Enhancements.

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## More apps by Greg Paskal

- [Time to Complete](https://appshunter.io/ios/app/time-to-complete/id322758378)
- [Talk About](https://appshunter.io/ios/app/talk-about/id411734694)

All apps by Greg Paskal: https://appshunter.io/developer/322758381

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-14.*