How does a SCT focuser work?
How does a SCT focuser work?
The focusing knob of an SCT is located off to the side of the primary mirror, and as it’s turned a rod pushes the mirror near its edge to displace it. However, the mirror itself is held near its center on a long baffle tube. So when the knob is turned, the mirror tilts slightly.
How does a telescope focuser work?
The focuser moves the eyepiece holder up and down slightly, adjusting the focus of the eyepiece for each individual observer. There are friction focusers or rack-and-pinion focusers. Regardless of the type on your telescope, your focuser should move smoothly without causing your telescope to shake.
How do you focus a SCT telescope?
All Celestron SCTs and some Maks adjust focus by sliding the primary mirror along a set of nesting baffles inside the main tube. This is done by an arm to one side of the tube that is fixed to the mirror. Because of this design, some lateral shift may occur as you focus the scope.
How do you calibrate a Celestron focuser?
To calibrate using a Celestron hand control, press the MENU button, then select “Focuser,” then “Calibration.” If using either the Celestron Focuser Utility Program or Celestron PWI software, calibration can be done directly from the program’s user interface.
What is a focuser telescope?
As a rule, a focuser is a movable tube into which either an eyepiece, or a star diagonal with an eyepiece, or a photo / video camera are inserted. The focuser of the refractor telescope with an installed diagonal and eyepiece.
What is a focuser?
focuser (plural focusers) A device which allows one to adjust the focus of an instrument such as a telescope.
How does a Crayford focuser work?
The Crayford design moves the focuser drawtube by applying high pressure on a metal drive shaft that in turn presses against a flat surface machined into the metal focuser drawtube. The drawtube is held in place by sets of bearings on the opposite side of the drawtube from the drive shaft.
What is the difference between Maksutov Cassegrain and Schmidt Cassegrain?
The main difference between Schmidt-Cassegrains and Maksutov-Cassegrains is the corrector lens at the front of the telescope. Both scopes use spherical mirrors which induce spherical aberration.
What is mirror flop?
Mirror flop is movement in the primary mirror that occurs as the optical tube is aimed in different directions on the mount. As the mirror moves so does the image which is ‘image shift’.
How do you control a Celestron Focus Motor?
There are three options for powering your Celestron Focus Motor:
- When using a Celestron computerized mount, you can power and control the focus motor through the mount using the supplied AUX cable.
- If you are not using a Celestron mount, you can power and control the focus motor from a computer USB port.