Telescope Calculator & Guide
Plan telescope views and gear
Free · Designed for iPad. Not verified for macOS.
Plan telescope and eyepiece combinations, compare performance, and build a balanced observing kit.
Telescope Calculator & Guide helps visual observers understand how a telescope and eyepiece combination will perform before heading outside.
CALCULATE YOUR VIEW
• Calculate magnification, exit pupil, true field of view, focal ratio, and useful power ranges
• Include Barlow lenses and eyepiece apparent field of view
• Get clear guidance when a setup is too dim, too bright, or beyond a practical magnification limit
ORGANIZE YOUR EQUIPMENT
• Save multiple telescopes, eyepieces, and Barlow lenses
• Keep calculations on your device for quick reference
• Compare up to five eyepieces on the same telescope
PLAN A BALANCED KIT
• See high-power, all-round, and wide-field eyepiece targets for your telescope
• Spot duplicate focal lengths before buying more gear
• Open practical searches for eyepieces and useful accessories
LEARN AT THE TELESCOPE
Browse concise guides covering magnification, exit pupil, field of view, telescope types, aperture, seeing conditions, planetary observing, deep-sky observing, filters, Barlow lenses, equipment planning, beginner mistakes, and solar safety.
The app stores your telescope, eyepiece, and calculation entries on your device. It does not require an account.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improved calculations & general bug fixes.
The developer, Sahar Yehezkel Avraham, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Identifiers
- Usage Data
- Diagnostics
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- User Content
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Sahar Yehezkel Avraham
- Size
- 64.9 MB
- Category
- Reference
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - iPad
Requires iPadOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 Sahar Yehezkel Avraham