Page 7 eVscope eQquinox V1.1
o Accurate focus: To ensure perfect accuracy, point the eVscope on a bright star and use
the Bahtinov mask to adjust the focus and the coma (see Mirror Alignment).
i. Here is how to focus with the mask. In the « Explore » tab of your app, go to « Star », and select the
first one. Select « GoTo » to move the eVscope on it. Go to « eVscope » tab, then touch the Settings
icon on the top right of your screen and activate the « Auto » mode. Put the mask on top of the
tube. This will create a specific diffraction pattern for that bright star, with a central line and two spikes
forming an X. If the central line is positioned exactly in the middle of X, it means your eVscope is
perfectly focused. To achieve this result, you just need to manually rotate the focusing wheel at the
bottom of your eVscope and observe the results.
The orientation of the cross does not matter
ii. In these three images, you can see the star Rigel observed with our mask. The first two images are
out of focus, but by rotating the wheel, we were able to achieve perfect focus.
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