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07-11-2012, 08:29 AM   #31
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QuoteOriginally posted by Anvh Quote
Actually you could lay one of those multiple photos on top of the combined blurred version and simply delete everything you want to blur or vice versa.

Other benefit is when you take long exposure next to the road at night, it doesnt kill your 10 minute exposure because a car drives past with the headlights on since you simply take 1 extra photo to replace the one with the car.
And then another one when the next car comes along, and then another until the battery has run out. Sometimes roads are never without traffic for long enough.

07-11-2012, 10:54 AM   #32
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QuoteOriginally posted by mysticcowboy Quote
And then another one when the next car comes along, and then another until the battery has run out. Sometimes roads are never without traffic for long enough.
Then you use even shorter exposure, you just end up with more files.
05-09-2014, 04:20 PM - 1 Like   #33
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Multiple exposures, applications

The noise reduction for multiple exposures goes by the square root.
For a picture of stars, you would need to stack (average) 100 pictures to reduce noise by a factor of 10.

With my old Pentax Film camera, I used to make multiple exposures, to have two images of of the same person facing each other (Use dark background, Cover left side of lens and take picture of person on right side, then cover right side of lens and take picture of person on left side, using a clear filter that was darkened with one side blacked out).

Another interesting effect, is to take a picture that appears as if no one is on the trail/road. (Long exposure with dark ND filter, or average many normal exposures). The occasional person walking by disappears, and it looks like the place is empty.

Russ G.
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