Hi Steve,
Some years ago an article on S&T analysed a series of different focal reducers for SCs. As a final experiment the authors tried stacking diferent reducers with acceptable results. I cannot recall when the actual article was published but I guess you could find it.
While using a ST7 CCD (with its small chip) until last year myself, I tried all sort of combinations with different reducers. I wanted to obtain a lower resolution that what the 6.3 yielded. For your info, my best results were with a 3.3 Meade reducer and a 6.3 Celestron stacked together. Of course the field illumination was very uneven, but flats solved this issue and stars were reasonably round in the small chip area.
Hope it helps,
Josep M. Aymami
Some years ago an article on S&T analysed a series of different focal reducers for SCs. As a final experiment the authors tried stacking diferent reducers with acceptable results. I cannot recall when the actual article was published but I guess you could find it.
While using a ST7 CCD (with its small chip) until last year myself, I tried all sort of combinations with different reducers. I wanted to obtain a lower resolution that what the 6.3 yielded. For your info, my best results were with a 3.3 Meade reducer and a 6.3 Celestron stacked together. Of course the field illumination was very uneven, but flats solved this issue and stars were reasonably round in the small chip area.
Hope it helps,
Josep M. Aymami
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