Magna Calc

Name: Magna Calc
Price: 0.99 USD
Rating: 3 (2 reviews)
Author: Greg Paskal

Education

Only for iPhone

$0.99 · Designed for iPhone. Not verified for macOS.

2 Ratings
Age Rating

4+
Years
Category

Education
Developer

Greg Paskal
Language

EN
English
Size

883.7
KB

iPhone

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

Ratings & Reviews

3.0

out of 5

2 Ratings

Not really happy with it
12/27/2011

SteveG12436
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.
Not really happy with it
12/27/2011

SteveG12436

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.
Great Updates and Improvements
07/16/2025

gpaskal
Great improvements and updates for this app. Now utilizing modern iPhone features to help astronomers.
Great Updates and Improvements
07/16/2025

gpaskal

Great improvements and updates for this app. Now utilizing modern iPhone features to help astronomers.
Useless, just use calculator
Jan 7

South Star
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.
Useless, just use calculator
Jan 7

South Star

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.
Terrible
02/20/2016

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.
Terrible
02/20/2016

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.

Minor bug fixes.

Version 2.4 07/15/2025

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

Information

Seller: Greg Paskal
Size: 883.7 KB
Category: Education
Compatibility: Requires iOS 18.0 or later.

iPhone
Requires iOS 18.0 or later.

Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 2.0 or later.
Languages: English
Age Rating: 4+

4+

Learn More