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DPChallenge Forums >> Hardware and Software >> ok..bought a ND filter..now what
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Showing posts 26 - 29 of 29, (reverse)
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02/07/2006 03:37:23 PM · #26
Kirbic beat me to it. ND2 is 1 stop, ND4 is 2 stops, ND8 is 3 stops, ND 16 would be 4 stops (do they even make one that dark?). The numbers on the filter are the reciprocal of the light transmission; 1/2, 1/4, 1/8, 1/16: 1 stop, 2 stops, 3 stops, 4 stops.

Robt.
02/07/2006 03:42:57 PM · #27
Originally posted by lentil:

ok.. basic instruction is what i need

1. put filter on camera
2. set camera to.........(what mode)
3. exposure/aperature .......?

I know i am a pain and for that i am sorry.


Start by putting the camera in Shutter Priosity (Tv) mode. Install ND filter, dial up shutter speed you want, and see what happens. Camera will set aperture for you. BUT you may easily run out-of-gamut this way: it's quite possible that if you set shutter speed for, say, 30 seconds in a sunset shot then even f/32 will not be a small enough aperture and the shot will go overexposed.

Youc an set the camera in Aperture Priority (Av) mode at f/16 and then depress the shutter halfway and see what shutter speed the camera "assigns" to the shot; based on what shutter speed the camera picks, you can change the aperture to force an increased or decreased shutter speed.

Only practice will tell you how LONG of an exposure you need in a given situation; a fast-flowing stream requires less time to smooth out than a placid lake surface with wind ripples on it.

I do my shots like this in full manual mode, but then I have some experience at it so I'm comfortable witht hat.

Robt.
02/07/2006 03:44:00 PM · #28
Originally posted by lentil:

ok.. basic instruction is what i need

1. put filter on camera
2. set camera to.........(what mode)
3. exposure/aperature .......?

I know i am a pain and for that i am sorry.

1. Put camera into manual mode (M)
2. Place as many light-blocking (NDs, polarizers, etc.) filters you have on your lens as possible
3. Set the camera's ISO to 100 or lower (if available)
4. Set exposure time to something on the order of 1/2 to 20 seconds
5. Set aperature as needed to achieve long exposure (e.g. f22)
6. Take picture using a remote cable or the on-camera timer
7. Review histogram (push the "info" button during image review).
8. Repeat 4-7 as necessary to get desired effect.
02/07/2006 03:52:33 PM · #29
thanks :) i am such a newbie. I get really frustrated with myself when I cant do something.. This is a great help
Lisa
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