The bf109f-4 need to know more

[altsym]

Well put it this way.. I wouldn't want the F-4/R1 anywhere near me if I was an allied pilot.

 

[Juha]

The best fighter of 1942 - F-4/R1?

IMHO 109F-4 but against Il-2s and heavy bombers F-4/R1 or 109G-2/R6

Juha

 

[Denniss]

Several Bf 109 F-4/R1's:

Falcon's Messerschmitt Bf 109 Hangar

The text is slightly wrong, the /R1 is just the designation for F-4 prepared to carry the optional gondola guns (wiring etc) but doesn't tell anything about them installed or not. This /R1 preparation of the F-4 was standard equipment in all later Bf 109 series.