Just to further clarify, I've used it in a couple of ways on different images:
1. Taking 2 exposures, with the camera on the tripod. Aperture stays the same, ISO stays the same, just change the exposure time. Check the histogram after each shot to ensure you've captured the detail you want.
2. For handheld shots, or where you've only taken 1 shot, if you take it in RAW mode, the 16-bit data allows you to convert the RAW to TIFF, once where you've adjusted exposure for the highlights, and again for the shadows.
The 2 TIF's are then blended in photoshop as per above.
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