Check the listing for details. SVBONY SV165 30mm Ultra-Mini Guide Scope Telescope for Auto Guiding Camera 30mm. Condition: New. Listed at 53.99 USD. SV165 Mini Guide Scope Support sensitive auto guiding cameras for easy guide star acquisition Getting this guide scope makes sense for most astrophotographers out there. If you're just starting out, SV165 Mini Guide Scope is easy-to-use and performs well. If you're at the other extreme, using SV165 Mini Guide Scope on your smaller imaging rigs is more practical than trying to mount a larger, more exotic guide scope. If portability is important to you, SV165 Mini Guide Scope's compact size and relatively low weight will cooperate with your requirements. Note:Back focus distance can stretch up to 45mm. Please pay attention to stretch to the end. Buyer's Show Imaging telescopes or lenses: AstroTech AT115EDT ScopeImaging cameras: ZWO 294 MM PRO Imaging CameraMounts: Celestron AVX MountGuiding telescopes or lenses: SvBony 30 mm f/4 guidescope guide scopeGuiding cameras: asi zwo 120 MC-S Guide CameraFocal reducers: Astro Tech 0.8x Reducer/Flattener AT0.8xSoftware: NINA,PhD2,PixInsight,CPWIFilters: Chroma O3 3nm filter · Chroma Ha 3nm 31mm filter · Chroma S2 filterAccessory: ZWO EFW 2" Wheel · Thousand Oaks Dew Controller Heater · ZWO EAF Focuser Model SV106 50mm SV106 60mm SV165 Type of Telescope Achromatic Refractor Achromatic Refractor Lens Cemented Cemented Tube material Aluminum Alloy Aluminum Alloy Aperture 50mm / 1.97in 60mm / 2.36in Focal Length 190mm / 7.48in 240mm /9.45in 120 mm Focal Ratio F3.8 F4 F4 Coating Fully multi-coated Fully multi-coated FMC Best for imaging Deep sky Deep sky Deep sky User level Intermediate Intermediate Rough Focusing Range 30mm 35mm Focuser Helical Focuser with 8 mm Travel Helical Focuser with 8 mm Travel Connection to eyepiece 1.25inch 1.25inch 1.25inch Tube diameter 54.5mm Dewcap diameter 61mm Total Length 240mm ncluded accessories: Tube Rings and Dovetail Rail Lens Diameter 30 mm Support interface 1.25in Or M42*0.75 mount Camera 1.25in Or M42*0.75 mount Camera 1.25in Or M42*0.75 mount Camera Focuser Type Front Part Focuser Back Focus Adjustable Dovetail includes 1/4″ screw hole Tube Travel 45 mm Body Size 92x56x78mm / 3.62x2.20x3.07 in Surface technology Aluminum Profile about svbony