Same long focal length - pick aperture or AF-S?

Of course, if money is not an issue, one may want large aperture and AF-S. If you have to pick one, do you go for large aperture or AF-S?

We have seen a lot of discussions on how to determine sharpness. How does one go about determine AF speed?

BTW, thank you for participating in a discussion nicely, w/o using negative languages.

所有跟帖： 

• AFS！尼康从90年代的衰落就在于佳能的USM兴起。 -U96- ♂ (0 bytes) () 07/27/2009 postreply 11:40:03

• I think you should have batter answer. -WayCool- ♂ (233 bytes) () 07/27/2009 postreply 12:20:10

• I can't tell the AF difference -Big_Benz- ♂ (416 bytes) () 07/27/2009 postreply 12:40:40

• 善意地建议一下，批评意见会受到欢迎的，但是建议尽量避免 -sjmj- ♂ (133 bytes) () 07/27/2009 postreply 14:57:28