you may already knew or already figured it out.


the other day I visited some photography websites(in Chinese), on those sites, people were talking about Canon 328, Canon 640... at the beginning I didn't understand what they were talking about then figured out they were talking about Canon lenses


Canon328 IS stands for Canon 300mm f2.8L IS


same thing like Canon 428, 440, 456, 540, 640, 856


thinking it's interesting and want to share with you guys