06 inches, which may not be that A great deal if you Review it with other scopes on this checklist. Apart from that, its battery life also tops out at 5 several hours. So you will need to have battery backup with you when you have it on the sphere. https://infraredtelescope50482.smblogsites.com/28565247/the-definitive-guide-to-infrared-light-for-scope