FWIW, my F1 button is set to peaking across C1-C3. [My C4 is assigned to Scene]
ahh.. getting a little less foggy.
with Function buttons. if you change from F1 to F2 then all your F1 settings are replaced with your F2 settings.
So are you saying that if you set C1 to ISO =5000.
Then, pressing F1 followed by C1 would give you the iso 5000 with all the settings of F1 ?
ie : custom functions dont override your Function buttons..
p.s.
can you set a custom function to one of the scene modes ? or in your case does it bring up the whole scene menu ?
Imagine each C<n> is a bag. And in each bag, you always have 'n' items/settings.
Let's say Bag1(C1) has a pair of flip-flop(footwear), a pair of bermuda shorts(pants), a t-shirt(shirt), a boxer brief(underwear).
Bag2(C2) has a pair of snow boots(footwear), a pair of ski pants(pants), a thick sweater(shirt), a long-john(underwear).
Bag3(C3) has ...
You configure/choose your footwear, pants, shirt and underwear depending on your 'mode' and assign them into different bags(C<n>) - C1 is for summer in Hawaii and C2 for winter in New York. You carry all your bags with you when you travel. But you'd turn your mode dial to C1 when you're in Hawaii (or any tropic islands) and to C2, etc.
But the items are the same - footwear, pants, shirt and underwear. But their settings are different - flip-flop vs snow shoes.
You can assign F1 to flip-flop before saving to C1 and F1 to snow boots before saving to C2. When your mode dial is set to C1, your F1 will point to flip-flop. In C2, your F1 will point to snow boots.