Index: source/blender/editors/space_view3d/view3d_view.c
===================================================================
--- source/blender/editors/space_view3d/view3d_view.c	(revision 41442)
+++ source/blender/editors/space_view3d/view3d_view.c	(working copy)
@@ -999,14 +999,18 @@
 	}
 	
 	if(rv3d->persp==RV3D_ORTHO) {
-		if(winx>winy) x1= -rv3d->dist;
-		else x1= -winx*rv3d->dist/winy;
-		x2= -x1;
-		
-		if(winx>winy) y1= -winy*rv3d->dist/winx;
-		else y1= -rv3d->dist;
-		y2= -y1;
-		
+		float dfac = rv3d->dist * 32.0f / lens;
+		if(winx > winy) {
+			x2 = dfac;
+			y2 = dfac * winy / winx;
+		}
+		else {
+			x2 = dfac * winx / winy;
+			y2 = dfac;
+		}
+		x1 = -x2;
+		y1 = -y2;
+
 		*clipend *= 0.5f;	// otherwise too extreme low zbuffer quality
 		*clipsta= - *clipend;
 		orth= 1;