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ND filter and Exp compensation - What is the difference?
I have been contemplating the idea of getting a 0.6 or 0.9 ND filter to take a longer exposures on a bright day (for shots like water falls, etc). Now my question is, If I meter with the auto settings and note down the parameters and then go fully manual with a -2 exposure compensation and reduce the shutter speed by 2 stops, will it have the same effect as the 0.6 ND filter?.

Thanks & Cheers,AppleChap..

Comments (6)

No. Your light meter works through the lens. If less light is hitting the meter because you've blocked some of it with a ND filter your correct exposure is going increase (slower shutter, larger aperture or higher ISO) to make up for the decrease in light. If you -2 EV on top of that you are just going to end up with a under exposed picture in most cases, no different than if you had no ND filter on and used -2 EV, you could try to recorrect the exposure in a RAW editor but you introduce problems like noise, color and dynamic range..

So no it's not the same, you may get control over the shutter the same but lose out on IQ..

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Comment #1

BA baracus wrote:.

If you -2 EV on top of that you are just going to end up with a under exposed > picture in most cases,.

Im not just trying the -2EV alone. Im also increasing the shutter time by 2 stops. Wouldn't they complement each other?.

No different than if you had no ND filter on and used -2 EV,.

Why and how do you say that?.

End of the day, all that I want to know is if I could avoid the ND filter some how and still manage to get the proper exposure? (I don't like the idea of adding an additional glass before my lens).

Thanks,AppleChap..

Comment #2

No it won't. Your image will be drastically overexposed with blown highlights, since you're shooting 2 stops slower. Its way out of the dynamic range of any digital sensor. You can't cleanly recover this with RAW converters..

This is not the same as darkening the view that goes into the camera..

AppleChap wrote:.

I have been contemplating the idea of getting a 0.6 or 0.9 ND filterto take a longer exposures on a bright day (for shots like waterfalls, etc). Now my question is, If I meter with the auto settingsand note down the parameters and then go fully manual with a -2exposure compensation and reduce the shutter speed by 2 stops, willit have the same effect as the 0.6 ND filter?..

Comment #3

ND filter cuts the light with 2 stops (ND2).Exposure compensation shifts the exposure.The two are completely separate.In an example:.

With a ND filter you have 1/15s and f/8 and without it 1/60 s and f/8. Both shots are well exposed..

With a +2EV exposure compensation you will get also 1/15 s and f/8 but the shot will be heavily overexposed.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/http://picasaweb.google.com/teodor.nitica/..

Comment #4

To get a really good waterfall effect on a 'bright day', a 0.6 or 0.9 isn't going to enough..

You're really wanting a 4 or 6 stop for bright sunny days..

Comment #5

AppleChap wrote:.

End of the day, all that I want to know is if I could avoid the NDfilter some how and still manage to get the proper exposure?.

Then shoot early in the morning or later in the day when the sun is/has gone down..

(I don't like the idea of adding an additional glass before my lens).

Then don't try taking long exposures during the daytime in sunlight. Otherwise gonna have to use a ND filter or filters stacked (a circular polarizer will also reduce the light by 1-2 stops) to get the shot..

Good Day,Roonal.

'Money doesn't buy happiness, but it makes for an extravagant depression' by golf tournament sportscaster..

Comment #6

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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