PanoTools NG:
Re: Canon 5D MKII
pedro_silva58 2012-Mar-18 11:11:21
greetings!
how are you guys so sure it's the shutter causing problems -- and not the lens diaphragm?
whenever i've had this kind of problem i've always been able to isolate it to a single lens (at a time), and it happened with the couple cameras i tested, so i know in my case it was the lens. it kind of makes sense, too, it's very easy for a single diafragm blade to get stuck, more so than either shutter blade, especially since the latter tend to be electronically controlled (the fp shutter principle may be the same since 1883, but replacing mechanical springs by electrical micromotors made a huge difference in practice -- and don't "we" prefer practice over principles?).
but since you experts are so quick to blame our modern shutters, for your exposure troubles... inquiring minds want to know!
cheers,
pedro
--- In #removed#, Erik Krause <erik.krause@...> wrote:
>
> Am 17.03.2012 22:48, schrieb Hans:
> > 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.
>
> That's all too true. And a good reason not to use too short exposure
> times. The more time the shutter stays open, the less is the influence
> of uneven shutter movement.
>
> But of course it's a pity that the vignetting correction model can't
> cope with this kind of uneven lighting. Should be possible though, much
> the same like vignetting correction works, too...
>
> --
> Erik Krause
> http://www.erik-krause.de
>
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