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Cheers S.
Yeah, there's something unusual going on and I'm not sure what it is. If you look at the spectral sensitivity curve for the 674, you're right, green is the most sensitive, although not by a huge margin.
And if you look at the bandpass for the Astronomik filters, they're almost equal.
However, when calculating a sky limited exposure you get (obviously going to depend on the method you use), the numbers I posted above. Oh and it's not a bug / error in that calculation either; the background ADU of the subs back up those numbers.
So either the sensor doesn't follow the curve it's supposed to, the filters don't have the bandpass they're supposed to, or the (dark) sky here is a lot more red than I'd have expected.
End of the day, doesn't matter which one of those it is if I don't change anything.
The ratios can be easily calculated from the above, scaling as appropriate.
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