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Ok. I look forward to checking it out at Lostock.
Relative focus tolerance is a function of F#. An F4 has 1/4 the focus tolerance of an F8.
The airy disc diameter does scale linearly with wavelength though, which actually means slightly lower resolution in the red wavelength. I'm wondering whether this is more to do with the particles in the atmosphere, how it wants to scatter blue wavelengths much more readily than red ones.
Food for thought..
Mark
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