#1140. Correction to r4132. Modified lens detection condition.

src/canonmn.cpp

@@ -1588,7 +1588,7 @@ namespace Exiv2 {
             # 1140
             if( metadata->findKey(ExifKey("Exif.Image.Model"        ))->value().toString() == "Canon EOS 30D"
             &&  metadata->findKey(ExifKey("Exif.CanonCs.Lens"       ))->value().toString() == "24 24 1"
-            &&  metadata->findKey(ExifKey("Exif.Photo.FocalLength"    ))->value().toString() == "24/1"
+            &&  metadata->findKey(ExifKey("Exif.CanonCs.MaxAperture"))->value().toString() == "95" // F2.8
             ){
                 return os << "Canon EF-S 24mm f/2.8 STM" ;
             }