Calculation of parameters and characteristics of telescopes using different eyepieces and visualization.

Settings:
- language (Russian English Hungarian Spanish German French Romanian Croatian Italian Sinhala Norwegian Persian Polish Japanese Portuguese Korean Catalan Dutch Arabic Greek Malay Luxembourgish Hindi Indonesian Ukrainian Hebrew Sardinian Czech Swedish Finnish Chinese Bengali Tamil Slovenian Turkish Bosnian Thai Bulgarian Vietnamese)
- scale
- text font size
- input by the slider
- comparison of telescopes
- bookmarks
- Moon phases
- help
- swipe

Telescope:
- List of telescopes
- Diameter
- Focal length
- Focuser

Eyepiece:
- Eyepiece list
- Focal length
- Field of view
- Barlow lens

Camera:
- list of cameras
- pixel size
- image size
- matrix size
- Binning

Calculations:
- Magnification
- Stellar magnitude
- Field of view
- Maximum field of view
- f-number
- Diameter of exit pupil
- Angular resolution
- Size of craters on Moon
- 2D 1.4D 1D 0.7D 0.5D

- Sun
- ISS

Planets:
- Mercury
- Venus
- Earth
- Mars
- Jupiter
- Saturn
- Uranus
- Neptune
- Pluto

Asteroids:
- Ceres
- Pallas
- Juno
- Vesta
- Ida
- Gaspra

Satellite:
- Moon
- Titan
- Io
- Europa
- Ganymede
- Callisto
- Titania
- Ray

Messier:
M1 M8 M13 M16 M17 M20 M27 M31 M33 M42 M45 M51 M57 M58 M63 M64 M74 M78 M81 M82 M83 M88 M97 M99 M100 M101 M104 M108

NGC:
891 2359 2392 2440 4565 4631 5189 6302 6543 6960 6979 7000 7662

IC:
1805 1848 2118