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Hamish,
The "Bible" on granulation is Bray, Loughhead and Durrant's "The Solar granulation", CUP, 1984.
They determine seeing conditions are the major factor (surprise, surprise!)
On page 46, they present a table showing the measured contrast granulation to inter-granulation lanes:
Wavelength (nm) Contrast (%)
530 16
595 23
550 21-27
465 36
It would appear any filter which picks up on the continuum around 465-595nm would give best results.
Ken
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