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Old 05-08-2020, 03:48 PM
Stefan Buda
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Stefan Buda is offline
 
Join Date: Jul 2013
Location: Melbourne, VIC
Posts: 823
First look at Andy's TOA-130.

My estimate, based on defocused star images taken through a 3D printed mask, for the objective tilt, seems spot on. I was expecting about 3mm at the sensor.
However there is a bit of a problem because about one quarter of the error is coming from the focuser. As I rotate the focuser, the error varies from 50% to 100% at the best and worst orientations.
If I eliminate the objective tilt, the remaining focuser tilt might become insignificant though.
All four sets of reflections seem consistent so I'm happy that I won't need to touch the inter lens adjustments.
The attached image shows only three sets of reflections.
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Click for full-size image (FirstLook.JPG)
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