Now that's one cool image to me! I bet that would give you a scare
when you first opened the image iif you were not expecting it.
Bob Gilley
http://www.gilleyphotography.com/
http://www.pbase.com/bobgilley
On Mon, Aug 30, 2010 at 10:48 AM, Alan Hoyle <alan.hoyle@gmail.com> wrote:
> Here is what a "rolling electronic shutter" can do to distort images:
>
> http://www.flickr.com/photos/sorenragsdale/3192314056/
>
> --
> - Alan Hoyle - alan@alanhoyle.com - http://www.alanhoyle.com/ -
>
>
>
> On Tue, Aug 24, 2010 at 11:43 AM, Alan Hoyle <alan@alanhoyle.com> wrote:
>> This isn't true: there are fully electronic, solid-state shutters
>> with no mechanical moving parts.
>>
>> http://www.olympusmicro.com/primer/java/photomicrography/ccd/shutter/index.html
>>
>> Basically, the sensor accumulates electrons as it's exposed to light.
>> the electronic shutter dumps accumulated electrons to trash, "opens"
>> the shutter and shunts electrons to the "signal" line, and then
>> "closes" the shutter by turning off the shunt. This has the
>> disadvantage that electrons accumulate while the shutter is dumping
>> the trashed electrons, which decreases accuracy.
>>
>> This is used in combination with a mechanical shutter for better exposure.
>>
>> In a mechanical/electronic hybrid, the mechanical shutter closes
>> during the "dump to trash" phase so electrons aren't accumulating
>> during that time as well which gives a cleaner image.
0 comments:
Post a Comment