Celestron EdgeHD 9.25" Optical Tube Assembly (OTA) (91040-XLT) Mounting Plate designed by Al Nagler

designed by Al Nagler

cycle through the three brightness levels starting with the dimmest

the wavelength in nanometers

This sturdy aluminum T-Adapter is the accessory of choice if you’d like to attach an SLR or DSLR camera to the smaller rear cell threads of a Celestron NexStar 4SE telescope or C90 spotting scope for prime focus photography

stainless steel worm gear

Celestron EdgeHD 9.25" Optical Tube Assembly (OTA) (91040-XLT) Mounting Plate designed by Al NaglerEdgeHD is an aplanatic, flat field Schmidt Cassegrain telescope that produces aberration free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off axis star coma; it also provides an astrograph quality flat focal plane all the way to the edge of the field of view. True Astrograph Quality Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint