[HDR-photo] (no subject)

[Perry Frantzman]

Hi Royce;
Still a bit confused about the Pentax 10KD AB and EV spacing
In the  Custom settings I can
1)EV Steps can be either 1/2 or 1/3 steps
I hope that means one half and one third

2)Auto bracketing order
choice of 3 frames or 5 frames with different shooting orders.

The only other thing would be Sensitivity Steps
which is a choice between
ISO sensitivity steps are set to 1 EV  or
ISO sensitivity steps are in accourance with EV Steps

What do you think gets me the biggest spread and how much would that be?
Thanks in advance


On 10/2/07, Royce Howland <royce at cospring.com> wrote:
>
> Don Kuespert wrote:
> > I want to streamline the HDR process by using  RAW, produce three
> > exposures separated by a speed factor of 4 to 8, all at the same
> > aperture to control depth of field.
>
> Don, I'm not sure what you mean by "speed factor". If you mean the
> factor for dividing/multiplying shutter speed, this equates to 2 - 4
> f-stops (or EV). Merging multiple exposures into a single HDR file is a
> sampling process. The wider the gap between samples the more potential
> there is for reduced quality in the results. I think most folks on this
> list are using exposures 1 - 2 EV apart; personally I don't recommend
> stepping exposures farther apart than 2 stops.
>
> Partly this is determined by the exposure bracketing function of your
> camera. Again, I reckon most are using AEB rather than manually
> adjusting exposure for each successive frame. AEB means you touch the
> camera less, leading to less potential for image registration problems
> during the merge. And AEB also means shooting through the frame sequence
> faster which may reduce the amount of mismatch potential from objects
> that move within the frame.
>
> You are correct to maintain the same aperture to hold DOF constant.
>
> As others have stated, how many shots you need separated by any given EV
> spacing depends in large part on how much dynamic range exists within
> the scene, and how much of it you need to capture for your purposes. A
> good tutorial on how to bracket your shot sequence can be found here:
> http://beforethecoffee.wordpress.com/bracketing-number-of-images/
>
> I also discussed the matter, though less thoroughly :), in my older HDR
> tutorial at NatureScapes.Net:
> http://www.naturescapes.net/072006/rh0706_4.htm#exposure
>
> > Will this produce high quality HDR?
>
> I'll leave this question for now since the issue of quality is
> subjective and depends on many factors. :)
>
> Royce Howland
> Calgary, Alberta
>
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-- 
Perry Frantzman
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