Astromania 1.25" High Precision Double Helical Focuser with 0.05mm Scale for Telescope Lenses/Finder & Guidescope

For guider scope or finder scope interface; solution for telescopes or telephoto lenses with sluggish focusing; fixed orientation so no rotation of mounted cameras or eyepieces or field of view with guide star when focusing Upgrade R and P focuser by adding to the end of one focuser by using Astromania M42x0.75 Female to M42x0.75 Female Thread Telescope Adapter 9mm; please make sure that there is M42x0;75 male thread on R and P focuser Made by full metal; one side of double helical focuser is M31X0.5 male thread; 1.25 inch accessory collar with M42x0.75 male T-thread flangeand accesory collar thumbscrews on the other side that install StarShoot AutoGuider or 1.25 inch eyepiece Interface: 1.25 inch with M42x0.75 male thread; primary Mirror Interfaces: M31X0.5 or M42X0.75; include M31X0.5 female thread to M42x0.75 male thread Adapter which get M31X0.5 male thread or M42X0.75 male thread on this side Accuracy 0.05mm; focusing stroke: 10mm; minimum length: 46mm; longest length: 56mm