[tonylsb]

各位師兄/師姐，
我用 7D ， CF card 30/Ms
請幫忙解答点解每次用數秒(如5秒)曝光後要等大約3-5秒後嗰影象才顯示。
係唔係有关setting 出錯或者部机壞！！
Tks.

[marco5633]

你係咪開左長時間曝光雜訊消除?

[wing769394]

正常，如果比起單核機仲叫快tim。

[tonylsb]

我係開咗，如果关上雜訊會唔會多咗！

[look_yau]

>>我係開咗，如果关上雜訊會唔會多咗

果幾秒係消除緊雜訊！

[hkklchan]

除左消除雜訊就快返

[h0001244]

Want to ask is 長時間曝光雜訊消除 (say 5~30s) same as DPP noise reduction ?

[talestar]

dpp can do fine tune but they are the same function
over 1 sec will activate the "NR" function in camera

[h0001244]

Oh thx Talestar..... then I think for long exposure, the NR can be done in DPP...... at least DPP won't take 30sec to do the NR like the camera

[stanleyau]

No. They're NOT the same function, "長時間曝光雜訊消除" is kind of Dark Frame Subtraction! It is different to what DPP's Noise Reduction is doing. It can only be done by the camera.

for your reference: http://en.wikipedia.org/wiki/Dark_frame_subtraction

[stanleyau]

and that's why "長時間曝光雜訊消除" takes same time as your exposure time..

[h0001244]

Oh thanks stanleyau ching, you recalled my memory. I haven't taken long exposure for quite a few years already...........since I found that long exposure is quite noisy, not like the days by film.