You should really read the KBAP info thread. Morale is discussed there.
+1 morale = +10% atk/def/110% crit
+2 morale = +20% atk/def/120% crit
+3 morale = +30% atk/def/140% crit
However, the telescopic sight is a big deal for archers anyway, so if you can use both sets, it will be great.
As for the Archmage's staff - it's again in the KBAP info thread. Morale is reduced (ONLY) if you use archmages in the army by 5 per battle, if I recall correctly. It affects their ranged magic-based lightning attack (without notifying you, but it does improve), not their close one, which is physical based.
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