Celestron 82291 instruction manual

Having the reflected laser beam showing safely on the grid plane you can finish the collimation process quickly.

Tilt the main mirror with the help of the adjustment screws until the laser beam passes through the Thathole ’(ands it! is reflected into itself).

Your Newtonian is perfectly collimated. A final check of the collimation has to be done with a star image (see below).

Picture left shows the coma error in a heavily misaligned Newtonian – highly enlarged and exaggerated.

Picture right shows a star image also highly enlarged after collimation (highly idealised as well).

Adjusting Schmidt-Cassegrain (SC) telescopes with the new (black body) Laser ColliTM

Adjusting SC-Optics by means of a laser is not an easy task.

Reason being – other than in an Newtonian optical system – the SC-secondary mirror is shaped strongly convex thereby dispersing the beam of most common lasers into a blob or otherwise odd- shaped form, rendering it unusable for defining the actual center of the reflected laser beam.

It takes a careful selection of lasers (we have a reject rate of 35%) and a special technique for sharpening the outgoing laser beam, in order to perceive a sharply defined round laser signal, when reflected from an SC-secondary mirror.

Another, mostLaserimportant-Colli™help in this task are the hundreds of crossmarks, etched into the reference

plate of the. They glow much more strongly compared to a simple opaque glass, making it a lot easier to perceive the center of the reflected laser beam.

Look at the different reflections as producedLaserby-Collia silver™ colored Newton Laser-Colli™of the first

generation, compared to the GEN II SC-featuring a black metal body.

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