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.
>
> -a
>
> --
> - Alan Hoyle - alan@alanhoyle.com - http://www.alanhoyle.com/ -
>
>
>
> On Sat, Aug 21, 2010 at 11:02 PM, Tom Beach <tomb2021@comcast.net> wrote:
>> Arthur,
>>
>> At the risk of supplying TMI I have never seen an electronic
>> shutter. Shutters are always mechanical. It's just that there
>> are two places in the camera where designers put shutters.
>> Any camera with a fixed lens has has the shutter incorporated
>> into the lens. The design of any lens system is such that there
>> is a point in the lens where all of the optical information is
>> focused into a very narrow beam. By placing the shutter
>> mechanism there the shutter has a very small space that it
>> needs to open and reclose. Therefore it can operate quickly.
>> This was also the case with view cameras which, while they
>> have interchangeable lenses, the shutter is built into the lens
>> mechanism.
>>
>> In an SLR, be it film or digital, the shutter is built into the camera
>> body and so needs to expose the entire film plane. (focal plane)
>> This is a much larger area to open and close so the two curtain
>> system is used which does not fully expose the full area at faster
>> shutter speeds.
>>
>> Tom
>>
>>
>> On 8/21/2010 4:08 PM, Arthur Bogard wrote:
>>> I saw that a few weeks ago and was astounded by the quality of the color
>>> pictures! It's always amazing to see technological improvements that end up
>>> lost and having to be rediscovered.
>>>
>>> On Sat, Aug 21, 2010 at 6:39 PM, Wotan<dr_voland@yahoo.com> wrote:
>>>
>>>>
>>>> this post has nothing to do with Olympus but it might be of general
>>>> interest to photographers. the links are to color pictures taken in
>>>> 1909-1910. the quality of color is rather unexpected. for some reason,
>>>> boston.com decided to publish an extract from the collection here:
>>>> http://tinyurl.com/36wmgnx. complete list of works can be found here:
>>>> http://tinyurl.com/9e1i.
>>>>
>>>> i hesitated whether i should make an off topic post but then decided it
>>>> might pique the interest of some on the list.
>>>>
>>>> regards,
>>>> -vlad
>>>>
>>>>
>>>>
>>>
>>> [Non-text portions of this message have been removed]
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> Group's site: http://groups.yahoo.com/group/MyOlympus/Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
>> ------------------------------------
>>
>> Group's site: http://groups.yahoo.com/group/MyOlympus/Yahoo! Groups Links
>>
>>
>>
>>
>
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