Orion said:It has a racked-in height of 2-11/16" and 1.4" (35mm) of drawtube travel. The base is contoured to fit Orion 8"- to 12"-aperture Dobsonian and other telescope reflector tubes. It replaces 2" rack-and-pinion focusers on Orion telescope reflectors.
NOTE: For 203mm (8") f/4.9 and 254mm (10") f/4.7 Orion reflectors, a #5122 eyepiece adapter is needed to reach focus. For attachment of a camera body for prime-focus photography, a #5117 T-thread camera adapter is required (sold separately)."
zeriodpeezeriod said:According to the instructions I'm following, I need a 1.25" focuser with minimum fully racked in height of 1 3/4 inches.
A "Find 1.25" Focuser is a type of telescope focusing mechanism designed specifically for use with an 8" Newtonian telescope. It allows for precise and smooth adjustments to the telescope's focus, enabling clearer and sharper views of celestial objects.
The "Find 1.25" Focuser uses a rack-and-pinion system to move the eyepiece or camera closer to or further away from the primary mirror of the telescope. This allows for precise adjustments to the focus point, resulting in clearer and more detailed views of celestial objects.
While not absolutely necessary, a "Find 1.25" Focuser can greatly enhance the viewing experience with an 8" Newtonian telescope. It allows for more precise focusing, which can make a significant difference in the clarity and detail of observed objects.
Installation of a "Find 1.25" Focuser can vary depending on the specific model and your level of experience with telescope maintenance. It is recommended to consult the manufacturer's instructions or seek the assistance of a professional if you are uncertain about the installation process.
Yes, there are other types of focusers that can be used with an 8" Newtonian telescope, such as Crayford and helical focusers. These may offer similar or even better performance, but it ultimately depends on personal preference and the specific telescope setup.