Tony, was sighting better penatration figures for the 37mm, or therioising at anyrate. Again this at close range, and aganst the rear or sides. Just because a shell is not big does not mean it is capable of acheaving penatration, look at the figures for the 2.8cm taper Boar AT gun realative to it's boar size for example.
Bellow are the armor figures for the Tiger E, as you can see their is a weak spot that the Field gun could exploit under"optimal" conditations, now this is obviously streaching it a bit and it asumes a few things, like the 37mm field gun is infact the most deadly Varient the Germans produced, the Tiger is parked right next to it and exposing the weak spot and that AH factors things in like Citical hits, all in all a prety far strech.
Hull Front, Upper 102@20°, 100@10°
Hull Front, Lower 62@60°, 100@24°
Hull Sides, Upper 82, 80@0°
Hull Sides, Lower 62, 60@0°
Hull Rear 82@20°, 80@8°
Hull Top 25@90°
Hull Bottom 25@90°
Turret Front 100@0°-11°, 100@8°
mantlet: 100-110@0°
Turret Sides 82, 80@0°
Turret Rear 82, 80@0°
Turret Top 26, 25@81°-90°