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HDR, Panoramas and Tone Mapping Merging several different exposures into a single image

HDR using wireless nikon flash for rim light

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  #11  
Old 06-27-2011, 08:04 PM
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mistermonday mistermonday is offline
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Re: HDR using wireless nikon flash for rim light

Thinkpic, with HDR you want to keep the aperature fixed. As for the strange behavior, go into your Shooting menu and make sure that Auto ISO is disabled.
Regards, Murray
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  #12  
Old 06-27-2011, 08:47 PM
thinkpic thinkpic is offline
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Re: HDR using wireless nikon flash for rim light

The mystery of the changing aperture and exposure compensation has been solved. I am embarrassed but it seems I forgot to turn off bracketing on the D700 so that was resorting to exposure compensation for the bracketing. I will understand if you all ignore my posts from now on, but there are so many peramaters I fell into the trap of making such a rudimentary mistake!!

Having said that I can't understand what exposure compensation was actually doing in autobracket mode - while I was manually setting the shutter speed from 1/250th to 1/50th the aperture only altered by a fraction of a stop yet the ambient light stayed basically constant.

Also, I still do not have a solution for bracketing these shots with wireless flash induced rim light but maybe Nikon can help. Thaks again everyone for your interest and help.
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  #13  
Old 06-27-2011, 09:00 PM
RobertAsh RobertAsh is offline
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Re: HDR using wireless nikon flash for rim light

You need to manually turn down the power of your flash(es) between each exposure. First exposure, full power. 2nd at 1/2 or 1/4 power, etc.

For auto-bracket the camera is likely remembering the previous settings and going from there. Also, as Murray suggested, it might have been resetting the ISO. You might want to check the EXIF information of one of the bracketed series you shot, that might tell you.
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  #14  
Old 06-27-2011, 10:47 PM
thinkpic thinkpic is offline
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Re: HDR using wireless nikon flash for rim light

With everyone's help and some perseverance I have finally cracked it!

It takes a very detailed approach. I must have been overlooking one thing or another until now but here is the solution for a 5 exposure bracket with each exposure seperated by 1 stop. For my test I was using a small sculpture with the flash 3/4 back for the rim and shooting inside (it was a small subject, the flash was close and I was shooting in low ambient light to the flash had to be dialled right back to -128 but I suppose the principal would remain the same no matter what and where I was shooting:

Setting on the camera:

1. Set exposure mode to manual.
2. Set speed to 1/250th
3. Turn off auto ISO
4. Flash sync speed set to 1/250th
5. Flash shutter speed set to 1/60th.
6. Flash control for built in flash set to commander mode
7. Commander mode set as follows:
- Built in flash set to TTL -3.0 compensation
- Group A set to M with compensation set very low (in my case to 1/128th)
8. Autobracketing set to 0F - which I believe means it is off.
9. White balance set to something constant
10. No exposure compensation

Settings on the flash:

1. Set to commander mode.

To Shoot:

1. Set ISO and aperture so that image is underexposed by 2 stops at 1/250th of a second.

Actuate. (2 stops under)

Reduce speed to 1/125th

Actuate (1 stop under)

Reduce speed to 1/60th

Actuate (correct exposure)

Reduce Speed to 1/30th

Actuate (1 stop over)

Reduce Speed to 1/15th

Actuate (2 stops over)

And there you have it a 5 pix bracket with nikon wireless flash providing rim light suitable for HDR photography.

Thanks Robert adn Murray again for your help
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  #15  
Old 06-28-2011, 12:37 AM
RobertAsh RobertAsh is offline
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Re: HDR using wireless nikon flash for rim light

Ahhh. Ok. So if I understand you correctly what you're doing is HDR'ing for the background and maybe as well for the statue's shadows, not for the statue highlights. That part I didn't know I was assuming you were HDR'ing only the statue.

Well, whatcha waitin' for? Post some results!!

Last edited by RobertAsh; 06-28-2011 at 01:05 AM.
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  #16  
Old 06-30-2011, 05:45 AM
thinkpic thinkpic is offline
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Re: HDR using wireless nikon flash for rim light

I've just got my smoking new i7 with an ssdscratch disk and 16 gigs of ram. I'm configuring it then doing some test and then I will have ago at this. Thanks for the help.
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