PanoTools NG:
Re: Canon 5D MKII
Hans 2012-Mar-17 22:48:05
--- In #removed#, Erik Krause <erik.krause@...> wrote:
>
> Am 17.03.2012 20:37, schrieb ptgroup:
> > ...at higher speeds the shutter opens only part of the sensor....
> >
> > I can?t get any information on that.
> > If only parts of the sensor would be used- what kind of image shall I expect ?
> > I wonder how a film then is completely exposed a 1/1000 ??
>
> You have two shutter curtains, an opening one and a closing one. At
> short exposure times the closing one starts to close while the opening
> one still hasn't opened the whole sensor. At very short exposure times
> it's just a slit between the opening and closing curtain which moves
> across the sensor: http://www.youtube.com/watch?v=ptfSW4eW25g
And that has not changed much for the last 129 years.
The focal plane shutter was invented and patented in 1883 and the principe is the same today in digital cameras.
Much of the problems with uneven exposure which you had on the first Leicas from 1925 are still the same, especially when you do Gigapixel panos you will figure out that the blender can not cope with even the slightest change in exposure from left to right side.
A difference of 2-3 % is enough to give PTGui problems if you have too little overlap.
Hans
>
> The shortest time where the sensor is full open is the shortest flash
> sync time. Usually that's 1/250s for decent DSLR's.
>
> --
> Erik Krause
> http://www.erik-krause.de
>
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