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Anything F4....get ready for coma and collimation struggles. The sweet spot on an F5 is something like 2.5mm wide, on an F4 it goes down to under a mm (something like that anyway)
They are a little like that girlfriend you had in your 20's.....they are short, look pretty, they make things happen really quick but they're pretty high maintenance.
I've just moved from an F4 to and F5 because I got sick of playing with it.
Also if using an F4 you will need a coma corrector without doubt....another thing to play with and get right in respect to proper spacing
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