[HDR-photo] (no subject)

[Perry Frantzman]

Thank you for taking the time that you did to explain.



On 10/2/07, Royce Howland <royce at cospring.com> wrote:
>
> Perry Frantzman wrote:
> > 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
>
> Perry, I just checked the Pentax K10D manual found at this URL:
> http://www.pentaximaging.com/files/product/K10D_Manual.pdf
>
> Auto-exposure bracketing is covered on pages 163 - 164. This info
> specifies either 3 or 5 frames with intervals up to 2 EV in fractional
> steps of either 1/2 or 1/3 EV. The fractions of 1/3 or 1/2 as set in the
> custom function simply gives you control over how fine your exposure
> compensation adjustments can be; I (and I think most others) typically
> use 1/3 EV fractions. This is different than the maximum interval used
> for AEB, which on your camera is set using the rear dial and shown on
> the status LCD (and probably also in the viewfinder).
>
> > 2)Auto bracketing order
> > choice of 3 frames or 5 frames with different shooting orders.
>
> Choice of 3 or 5 frames depends on how much dynamic range you want to
> capture. On my Canon 5D I can only shoot AEB sequences of 3 frames,
> nothing more. If I need to capture more DR, I have to manually adjust
> the camera exposure in between bursts of 3 AEB frames.
>
> Shooting order often doesn't matter too much, I just use the default
> which on Canon is normal, under, over (same as the Pentax default). This
> leaves the slowest shutter speed for the last frame which can have some
> benefit when subjects are moving in the frame.
>
> > 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
>
> Steer clear of ISO-based bracketing, in my opinion the image quality hit
> isn't worth it. I prefer to keep 100% of all camera settings constant,
> varying only the shutter speed.
>
> > What do you think gets me the biggest spread and how much would that be?
>
> Looks like your biggest range is 5 frames at 2 EV apart, for a total
> bracket range of 10 EV on top of whatever the basic single frame capture
> is. This probably gives you a combined DR capture of about 18 EV or so
> across the 5 frames, which should be very usable... better than my 5D
> can do without manual intervention. :)
>
> Royce Howland
> Calgary, Alberta
>
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-- 
Perry Frantzman
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