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Hello Gary,
Thanks for your nice comments.
The corrected field is about 20mm while the diagonal of the Canon chip is 27mm. The only way to improve this is to change the focuser and corrector.
I now have a 2 inch corrector but it could be replaced by a 3 inch version.
The secondary is quite large already.
On the other hand, if I use a flatfield the vignetting is not noticeable.
At te Astrofest I met two Dutch speaking amateurs from Australia, John and Daniel, there seem to be quite a lot of people with roots in the Netherlands in Australia!
Regards,
Albert
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