When you use SV105 planet camera with a telescope, you need to adjust the telescope focus wheel while checking the image on your computer for clarity/sharpness.Note: SV105 telescope eyepiece camera does not autofocus; you need to adjust the telescope focus to see a clear image.SV105 SVbony camera works with many Windows, Linux, and Android systems.SV105 Telescope eyepiece camera works with telescopes with focal lengths ranging from 400mm to 800mm, so a refractor telescope with this focal length should see a clear image without any accessories.A tip for beginners: If you are photographing the moon, turn the gain and brightness down a bit, as the moon is closer and brighter. When photographing planets, increase the gain and brightness, as they are much fainter objects. 1.25” telescope filter is a multi-band pass filter transmitting a high percentage of light in the visual spectrum; the filter enhances contrast when observing brighter objects including the moon and planets. Suppresses skyglow from artificial lighting and background glow reflected from moonrise.