Figure 3.11 The eyepiece clamp and lock nut. You can adjust for the different eye-point / eye relief distances
of various eyepieces by means of positioning the locknut at different points along the connecting thread of
the eyepiece clamp.
Left
: The lock nut is near the end for eyepieces with longer eye relief (note there are
about 2 full threads between the lock nut and the base of the threaded region).
Right
: The lock nut is right
down the thread for those with shorter eye relief (i.e. 0 threads between the lock nut and the base of the
threaded region). This adjustment cannot compensate for eyepieces with very short eye relief and such
eyepieces will require a customised adapter to be designed and printed. Such customisations are possible
due to the 3D printed nature of the clamp but will need to be done by the user – custom clamp are not
supplied with the AF51 as sold by OptArc. For eyepieces with very long eye relief such that even the
situation shown on the left does not give sufficient distance, the clamp can be positioned higher up the
eyepiece to increase its range.
Figure 3.12 Screw the eyepiece clamp onto
the adjustable mount as shown.
OptArc AF51 Camera Page 38 of 99 User Guide v1.02
