Different Exposure time needs different Dark times?

[The Jackal]

Hi Guys

I just want to know the following. If you shoot say X20 Lights 240seconds Iso800 AND X20 Lights 60seconds Iso800 do i need to make two different time sets for my draks too?

I shot last night at those times and only shot X20 Darks at 240seconds and Iso800.

Is this the incorrect method or will it work?

Regards

Jack 

[Davey-T]

Yes, shoot darks the same setting / length as lights.

Dave

[The Jackal]

Yes, shoot darks the same setting / length as lights.

Dave

Dave do I have to shoot two sets of Darks? Once that are 240seconds long and a second set that is 60 seconds long?

[Davey-T]

Dave do I have to shoot two sets of Darks? Once that are 240seconds long and a second set that is 60 seconds long?

Yes, you only need about 16.

And try to do them at the same time to get roughly the same temperature

Dave

[ollypenrice]

In truth the mismatch in real temperature makes DSLR darks pretty hit and miss and some people find that a master bias and dither does a better job than darks. I'd do some experimenting.

Olly