A central target for laser alignment is permanently etched on surface. Field corrector lens group is designed with moderately curved surfaces to minimize multiple reflections from brighter stars and is magnesium fluoride AR coated on all surfaces. It is sized to illuminate a 35mm format to corners with negligible vignetting. The optical design is balanced to optimize the central 20mm for CCD performance and still deliver ideal 35mm film imagery. Optional enlarged rotatable T-ring adapters can interface 35mm SLRs.
Most fasteners are stainless steel.
Removable light shrouds at primary and prime focus are painted with low reflection textured powder coat. Full collimation adjustments are accessible. Focusing is via tiny DC gear motor with absolute position numeric LCD display on remote hand box that is battery operated with auto-off feature. A standard cable lenght of 10 feet is supplied and extensions to add another 50 feet are available. The truss tubes are outside the entrance pupil and do not interfere.