is it adviceable to switch onli to prime or zoom n prime together
30mm 1.4 sigma izzit gd coz i nv use sigma lens before so i like hear more bout tis lens
Depends on your shooting style. What do you shoot and why do you want to shoot only primes?
I didn't recommend zooms cos u said u wanted primes only. I've tried 28 f/1.8 before and it's pretty soft wide open. Even at f/2.8 it's only acceptable. I wouldn't recommend that.
You might have tried a lemon. I tried a 28 f/1.8 on a 5DII body and was blown away by the resolving power, even wide open. Wide angle meets shallow DOF - it's just surreal.