Messerschmitt Bf.109F - German Users, part three

The canopy of the Messerschmitt Bf.109F stayed basically the same as the one of the E-4, although the handbook of the F, claimed that the forward lower triangular panel to starboard was to be replaced by a metal panel with a port for firing signal flares. The great majority of F-1 and F-2s subvariants kept the glazed pannels. An additional two-piece all-metal armour plate head was added, just like in the E-4, to the hinged portion of the canopy. However, some of them lacked the curved top section. It featured also an optional bullet-resistant windscreen. Fuel tank was self-sealing and in 1942 many F-2 were retrofitted with additional armour made from layered light-alloy plate just aft of the pilot and fuel tank. The fuselage aft of the canopy remained essentially unchanged in its externals.
Tail section was slightly modified as well. The rudder was slightly reduced and the symmetrical fin section changed to an airfoil shape, which produced a sideways lift force that swung the tail slightly to the left. That helped to increase the effectivness of the rudder, and made the need for application of right rudder on takeoff not so needed to counteract the effects of the torque effects from the engine and propeller. Bracing struts were also removed in the tail from the horizontal tailplanes, which were relocated slightly below and forward of their original positions.

Sources:
1. https://en.wikipedia.org/wiki/Messerschmitt_Bf_109_variants#Bf_109F
2. Salamander Books - The Complete Book of Fighters
3. Signal Squadron - Aircraft In action 57 - Messerschmitt Bf-109 in Action Pt.2
4. Osprey - Air Vanguard 23 - Messerschmitt Bf 109 E-F series(1)