This finderscope and guidescope comes with a special rail that fits the handle of the William-Optics apochromats.

Other special features are:

    An extra-long dew cap to prevent dew formation
    Helical focusing on the front lens
    Rotolock clamping for a secure hold with precise centering

 
Technical data
Performance
Connection (eyepiece side)
1.25"
Lens diameter (mm)
50
Focal length (mm)
200
Aperture ratio (f/)
4
Back focus (mm)
21.6
Special features
Ring clamping
Yes
equipment
Prism rail
Yes
Generally
type
Guiding aids
Construction type
Guidescope
Weight (g)
515
Length (mm)
270
series
UniGuide
Color
red