References in periodicals archive ?
The adapter made a huge difference in corner-to-corner illumination and should be considered a highly desirable item when using the camera with 2-inch focusers and coma correctors on fast Newtonians.
The focuser is now in the hands of the YAS for assembly on their uprated flagship telescope.
So in my judgment the extra back focus supplied by the focuser wouldn't be sufficient for most binoviewers without their accessory Barlow lenses.
I think this caliber of telescope would likely end up permanently installed in a dark-sky observatory and set up as a dedicated imaging platform with a single camera and some type of add-on motorized focuser.
This package comes with a 3-inch Feather Touch focuser and matched SFFR.
Without the focuser attached, the scope weighs about 65 pounds (29 kg).
Its 2/4-inch dual-speed, rack-and-pinion focuser includes both 2- and 1 1/4-inch eyepiece adapters, and accepts the optional SFFR-70APO focal reducer/field flattener ($295), converting the instrument into an f/4.
Orion Telescopes & Binoculars introduces the 60mm Multi-Use Guide Scope with Helical Focuser ($219.
The Quattros use a Crayford-style focuser with a friction drive and 10:1 fine-speed motion.