Saturday, September 28, 2013

Astro-Tech 8" Imaging Newtonian, Part II

There's reasons why the Takahashi Epsilon costs over $5000. One of which is that the Epsilon can cover a 44mm image circle. Another is that the Epsilon is very sturdily built, so collimation doesn't shift.

Here's first light from my Franken-scope:  note the very heavy vignetting on the APS-C sensor:


And the stars aren't round across the sensor.  In fact they are all kinds of shapes (these are the four corners):


I will have to collimate the scope more properly.  Also learned that the tube beneath the focuser needs to be reinforced to prevent flexure, something like this (not my picture).


Well, these are things to do on a Saturday..

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