Telescope Comparison shows side by side comparison of two telescopes with eyepieces. The simulated view and several readouts automatically calculate and refresh as you change the settings. Use the menus below to select different telescopes, eyepieces and objects to view to see different simulations. Enjoy!

Telescope and Eyepiece settings

Did you ever wonder want to see the diference between a 4" telescope and and 8" telescope? If you can't make it to a star party or telescope exhibition, you can try this tool to get started!

This tool will help illustrate the difference between two same or diferent telescopes with various eyepiece combinations. To use the telescope comparison tool, click on the dropdown menus and use the scroller to find an item to select. You can see what different telescopes with the same or different eyepieces may look like by creating various combinations.

To change the object being viewed, click the arrow next to the 'Object Data' label and make a selection. To view planets (Mars, Jupiter, Saturn), you must lower the eyepiece focal length (try 9mm) and possibly select the 2X barlow. To view the Pleiades, you will need to select NO Barlow and use an eyepiece with higher focal length (try 50mm).