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Photography and time lapse

smourt 15 80
23 Apr 2009 12:12PM
So sunny 16 rule:

Set camera to F16 and exposure to 1/100 (ISO100) when it is sunny Smile

Applying same logic:

F16 is 1/100
F8 is 1/400
F4 is 1/1600

So... My question is

If I am doing time lapse photography shooting at F16 in the day, at some point I need to create a longer exposure for evening but maintain the same ambient light, what would that be... is it possible?

Looking at an image I took last night at F10 the prefered exposure was 30".

Any thoughts?

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ade_mcfade 15 15.2k 216 England
23 Apr 2009 12:24PM
as it gets darker, you just expose longer - if you change the aperture, that'll change the DOF and your shots may start to look quite different.

If you're on 30second, you may want to look at upping the ISO to bring those times down a bit, unless you need 30 seconds for creative reasons of course.
smourt 15 80
23 Apr 2009 12:29PM

Yes the 30secs are for creative, what I am wanting to do is to catch the car light trails and the clouds moving in the sky at night too, but would not like there to be a change in ambient light... Perhaps I should look at the route of exposing at a higher ISO (200) then dropping to 100 after sunset...?
ade_mcfade 15 15.2k 216 England
23 Apr 2009 1:27PM
bit of a terminology mix up here...

by "ambient light" do you mean "exposure"

as in, you want the shots to look the same brightness on each photo.

ambient light is not controllable, that's down to the sun, clouds and time of day.

you can control exposure by changing aperture, shutter speed or film speed.
smourt 15 80
23 Apr 2009 4:10PM
No I am wanting continuity... so I mean ambient light as just that, except at different lengths of exposure... just like...

F16 is 1/100
F8 is 1/400
F4 is 1/1600

all produce the same "continuity" except for the depth of field of course...

You gave me an idea earlier, now I am thinking by shooting on ISO 200 and on F8 at 1/1600 of sec I can then set the camera to ISO 100 with F22 and a longer exposure... or something like that...
smourt 15 80
23 Apr 2009 6:09PM
Anyonecoming across this in the future look here for an answer...



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