SVBONY SV106 Guide Scope with Helical Focuser Finder and Guide Scope Multi-Use for Astronomical Telescope (50mm)

you can use this handy scope as a deluxe, straight-through 50mm finder by inserting an optional 1.25″ eyepiece (sold separately).
A practical benefit of this is that prior to guiding, you can insert an eyepiece into the guide scope and easily align the guide scope with your main imaging telescope.
Then remove the eyepiece and attach your autoguider camera

NOTE:
The fixed-orientation focuser mechanism will not rotate inserted autoguider cameras or eyepieces when focus adjustments are made.
The helical focuser simply moves the attached device inwards or outwards while maintaining its orientation.
This convenient feature means your field of potential guide stars will not rotate as focus is adjusted, further increasing ease of use

Features: Versatile 50mm aperture Guide Scope with a built-in helical focuser for precise focusing of potential guide stars

Designed for use with the guider CCD astronomy camera or eyepiece

Helical focuser collar will not rotate attached autoguider devices during focus adjustments

Used as a deluxe straight-through finder scope with optional 1.25″ eyepieces installed (eyepieces sold separately)

Specification:
Type of Telescope: Achromatic Refractor
Lens: Cemented
Tube material: Aluminum Alloy
Aperture: 50mm / 1.97in
Focal Length: 190mm / 7.48in
Focal Ratio: F4
Coating: Fully multi-coated
Best for imaging: Deep sky
User level: Intermediate
Rough Focusing Range: 30mm
Focuser: Helical Focuser with 8 mm Travel
Connection to eyepiece: 1.25inch
Tube diameter: 54.5mm
Dewcap diameter: 61mm
Total Length: 240mm
Included accessories: Tube Rings and Dovetail Rail

Package Includes:
50mm Primary Mirror
Guiding Bracket w/ 89mm Dovetail Plate
1.25inch Helical Focuser
6PCS Metal Thumbscrews