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Ah... joe I forgot to mention I was only interested in Baily's beads and the chromosphere - not the corona. A 0.7 degree field turned out just fine. The other aspect is full frame vs APSC dslr... I was using full frame and for 2017 probably will do again. This makes a significant difference with respect to the focal length - I agree if you're going to use an APSC sensor 500-600mm do will be plenty.
If you want the corona yes you want a wider field - and a shorter focal length.
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