[tktony]

我前個星期在旺角豐澤買左部數碼相機,買時店員保證10日內有問題包換,可我上星期發現新買的相機在相同環境下拍同一物體,用iso64比iso 200拍出的相片噪點仲多,於是去豐澤換,點知店員話要我去代理過度檢查過,真的有問題10日內拿回去包換,大老啊,我已經實買左有8日,找得代理去檢查,10日已過,10日包換即冇得換. 想問下其他店是否也是這樣做?

[tam_dominic]

2 seconds exposure at ISO 200
8 seconds exposure at ISO 64
Both exposed correct.

The 20 seconds exposure at ISO64 would give more noise and it is normal because long exposure time would generate noise.

This is not the problem of your Digital Camera.

If the exposure is above 1/30 second the ISO 200 should have more noise.