code means?

[blurblur]

Hi, I'm new to DSLR

I saw some lens with "APO", "FF", IF", "DG", "HSM"
can anyone let me what does it means


Thanks:sweatsm:

 

[jbma]

Google is your friend.

 

[JediForce4ever]

just for convenience sake....

APO: Apochromatic

FF: Full Frame

IF: Internal Focus

HSM: Hypersonic Motor

 

[+evenstar]

just different names for the lenses mechanism...there's a thread on this..

 

[VR2]

http://www.sigma-photo.co.jp/english/lens/index.htm