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G2-1600 camera flats problem at 90º rotation with GSO200F4, Paulo Nunes

G2-1600 camera flats problem at 90º rotation with GSO200F4

G2-1600 camera flats problem at 90º rotation with GSO200F4, Paulo Nunes

G2-1600 camera flats problem at 90º rotation with GSO200F4

Description

This was the vignetting problem found during the firsts nights tests with my new setup.

Conclusions:

1 - due to pronounced vignetting is possible to detect that the secondary mirror is not optical centered; after adjusting the secondary spider the vignetting center was now centered on the ccd.

2 - after simulating my setup (telescope+camera) on the Newt program I confirmed my test results. The easiest solution, after some trial and error of the physical parameters, for my setup was to diaphragm the primary mirror to a F5 scope.

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G2-1600 camera flats problem at 90º rotation with GSO200F4, Paulo Nunes