FAQ：Why is there a hole and a protruding part inside Cherno's tube?

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Why is there a hole and a protruding part inside Cherno's tube? Why the targeting points are not looking like dots?
Answer:
Thanks for the feedback for the Cherno!
1."The hole" is designed for reducing the reflex of the red dot, the hole design is different for different red dot.
2."The surface protruding beyond the outline of the tube" is the silicon glue for fixing the illumination system and protecting the circuit. It makes the Cherno works well in a low and high temperature.
3." Targeting points are not looking like dots like a distorted dot' , The single dot is 3MOA size, we do 100% quality check on collimator at the level 5. And the dot size tolerance quality control is less than 0.4MOA. As you know the optical principle of the red dot is reflex to human eyes, because of the red dot principle it hard to see an exact round dot,but we could make it extreme close to round.
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