Nikon D7000 Bracketing for HDR


HDR shooting with the D7000...


This is how I discern the conversation at The Nikonian's Forum on the topic. I have taken the liberty of trying to bring all the information into one place for people.  


You see a scene requiring multiple exposures for HDR.

Set up the tripod, choose aperture priority mode, lens, aperture setting, figure out how many exposures are necessary, composition, plug in the remote release if using one, take a drink, spray bug repellent on that spot on your leg you missed before, everything you normally do to set up.

For 9 Shots

·         set shutter release mode = CH (continuous high speed)

·         custom setting e6-> Bracketing order = under,meter,over (if using Photomatix any order will work--I like meter, under, over)

·         ISO = as desired and set ISO sensitivity in the Shooting menu to capture the highest ISO and minimum shutter speed for Auto ISO.  See below.  This is to prevent high ISO shots. 

·         bracketing = 3F for a 9 shot set in 1.0 EV increments


Before taking first bracketed set... You have to do this each time because the camera saves the aperture in settings.

·         turn the exposure comp dial to -3 EV for 9 shots

·         setup menu-> save user settings -> U1
after saving U1...

·         turn the exposure comp dial to +3 EV for 9 shots

·         setup menu -> save user settings -> U2
after saving U2...

·         turn the exposure comp dial to 0, and leave bracketing on 3F set in 1.0 EV increments

Turn Mode Dial to U1 and shoot, turn Mode Dial to A and shoot, turn Mode Dial to U2 and shoot

This creates nine exposures in the following order (relative to normal exposure):

-4EV -3EV -2EV -1EV 0EV +1EV +2EV +3EV +4EV

After shooting, review the histograms and possibly select a subset of the nine shots, deleting others.


For 5 Shots (different set up than for 9 because of the -2 or +2 bracketing)

·         set shutter release mode = CH (continuous high speed)

·         custom setting e6-> Bracketing order = under,meter,over (if using Photomatix any order will work--I like meter, under, over)

·         ISO = as desired and set ISO sensitivity in the Shooting menu to capture the highest ISO and minimum shutter speed for Auto ISO.  This is to prevent high ISO shots. 

·         bracketing = -2F or +2 for a 5 shot set in 1.0 EV increments


Before taking first bracketed set... You have to do this each time because the camera saves the aperture in settings.

·         turn the exposure comp dial to -1 EV for 5 shots with -2F bracketing - 1EV increment.

·         setup menu-> save user settings -> U1
after saving U1...

·         turn the exposure comp dial to +1 EV for 5 shots with +2F bracketing - 1EV increment

·         setup menu -> save user settings -> U2
after saving U2...

·         turn the exposure comp dial to 0, and turn OFF bracketing (this is different than 9 images)

Turn Mode Dial to U1 and shoot, turn Mode Dial to A and shoot, turn Mode Dial to U2 and shoot

This creates five exposures in the following order (relative to normal exposure):

-2EV -1EV 0EV +1EV +2EV

 

ISO Explanation

 From the manual p 103- "In modes P and A, sensitivity will only be adjusted if underexposure would result at the shutter speed selected for Minimum shutter speed. Slower shutter speeds will be used only if optimum exposure can not be achieved at the ISO sensitivity value selected for Maximum sensitivity. If the ISO sensitivity selected by the user is higher than the value selected for Maximum sensitivity, the value selected for Maximum sensitivity will be used instead."

The conclusion from this that in order to get the equivalent of an exposure lasting 64 seconds, set Maximum sensitivity to 200. To get the equivalent of a 128 second exposure, set the Maximum sensitivity to 400, and so-on.

For example, suppose we are shooting a bracket in 1EV increments in order -0+. Assume the first (shortest) exposure is exactly 1 sec. Then the camera will use ISO 100 (the value we specified for ISO sensitivity) for this shot. The next exposure would normally be 2 seconds; but since this is less than the minimum shutter speed, the camera will hold the shutter speed at 1 second and increases the ISO to 200. The next shot would normally be 4 seconds; again, since this exceeds 1 second, the camera will try to adjust the ISO. But since the ISO is already at the maximum, it will instead change the shutter speed to 2 seconds. So we should expect the following:

-1EV 1 sec at ISO 100

0EV 1 sec at ISO 200

+1EV 2 sec at ISO 200

 

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