Adjusting the focus
What is the focus?
The focus is the distance between the mirror and the sensor, which allows rays of light from
the object to converge correctly. The image will be blurry if the light rays converge before or
after the sensor.
How often should I adjust the focus?
Adjust the focus before any observation, including after leaving the telescope outdoors
to thermalize. You may need to readjust your focus during long nights of observation if the
temperature has dropped dramatically or if your other observation parameters have changed.
How do I use the Bahtinov mask for high-
precision focusing?
Go to the rst star recommended in the catalog because it will be the brightest star
available to you.
Separate the Bahtinov mask from the cover. Place it on the telescope’s tube, turning it
gently if necessary to t onto the tube.
This creates an X-shaped pattern visible in the eyepiece and on your screen. Pinch and
zoom on your device to see the X clearly.
If the pattern you see resembles the image below, your focus is complete.
Slowly turn the wheel until the line is centered in the X image.
The Bahtinov mask has three grills at
three dierent angles. It creates points of
diraction that allow for precise focusing.
5
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User guide | 18
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