[miro]

According to PZ

1. Canon 70-300 IS L @300mm FF test F=8

   - center - 3329

   - border - 2848

   - extreme border - 2745

2. Tamron 70-300 VC @300mm FF test F=8

   - center - 3082

   - border - 2626

   - extreme border -2614

 

My experiance - Tamron at 300mm is resonably sharp, but don't expect any wonder here. Finaly you get what you paid for!

As already mentioned at 70-200mm F=8 you can get razor sharp images