Good old fashioned trial and error it took me a while , one more thing its way easier with 2 people , you looking at the unfocused ( about 5-8 rings worth) stars image first and someone else turning the columination bolts for you .
Then once you see a concentric donut , de-focus to the other side of focus the same amount and the donut should look the same , if so focus torwards true focus to about 1-2 diffraction rings and as this point is reached you should se the 'Comet' shape as shown in the manual , at this point only tiny turns < 1/20th a turn is needed to get the comet tail to dissappare .
You will know when you have it
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Remember tiny movements at this stage .
Once the comet tail is gone , focus again closer to true focus and do it again , as many times a you want , getting closer and closer to true focus and a point will come when its perfect , you are now at perfect columination , tiny movements !! dont forget
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Lock up the centre bolt , not to tight , check and you will be rewarded with views only a Takahashi Mewlon can give ,, Perfect ! .
Brian.
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Originally Posted by ebeyonder
Thanks very much! Did you ever work out how each turn in a particular direction affected the movement of the shadow? Or was it just trial and error?
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