2011 Photomatix tutorial hdr – What is the ideal exposure range and exposure spacing?

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What is the ideal exposure range and exposure spacing?
The ideal exposure range is the one that covers the dynamic range of the scene you are shooting. So, the exposure range depends on the scene.
Photomatix Pro Tutorial:For many outdoors scenes, 3 exposures spaced one or two EVs apart may be sufficient. However, for an interior with an outside view on a sunny day, for instance, the dynamic range can be quite high.
An E.V. (Exposure Value) is also referred to as a stop (or full-stop when it is one E.V.). One E.V. increment corresponds to a doubling of the amount of light hitting the camera’s sensors. This means that a range of 8 E.V. can be achieved with exposure times ranging from 1/250 to 1 sec. for instance, assuming a fixed aperture and ISO setting. If you set your camera to +/-1EV step increments, you will need 9 frames to achieve that range. If you set it to +/-2EV, you will need 5 frames.
hdr photomatix tutorial:Regarding the exposure spacing, an increment of 1.5 or 2 E.V. is generally recommended. The advantage compared to an exposure spacing of one-EV is that it will limit the number of shots required to span the dynamic range, and therefore reduce the risks of mis-registrations and ghosting. It will also reduce storage needs and make for faster processing in Photomatix. On the other hand, a one-EV spacing -or lower- does have one advantage, which is to better smooth out noise when merging to an HDR image.

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