Chuck,
Wow. I am amazed at all the knowledge you and others on this list
have...and amazed at the fact that all of this has to happen how it does to
get the images we get. I sorta feel like how I imagine Abe Lincoln would
feel reading all of this...*the who has to do what for the why to occur???*
I understand what you said, I get it, I am just amazed at all of it. All
just for me to get a picture of my kids....astounding, really.
Thank you for taking the time to explain it, I do understand this better
now.
Candace
----- Original Message -----
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxx>
To: <olympus@xxxxxxxxxx>
Sent: Wednesday, August 23, 2006 8:03 PM
Subject: [OM] Re: new models?
> There are several types of sensors but the most basic differences are
> seen between what are called "full frame" sensors (which, in this
> context, has nothing to do with size) and "interline" sensors. Full
> frame sensors are what are used in DSLR's and interline sensors are used
> in video cameras, point and shoot cameras and especially P&S cameras
> that have a movie (video) mode.
>
> A full frame sensor is called that because it captures the entire frame
> all at once. It requires a mechanical shutter to protect the sensor
> from light. When the shutter is closed the electrical charge is drained
> from each pixel. When the shutter is opened light strikes the sensor
> and each pixel receives an electrical charge. When the shutter is
> closed the camera reads the data from every pixel on the sensor all at
> the same time (conceptually anyhow) and drains the charge in preparation
> for the next exposure.
>
> An interline sensor operates a bit like your computer monitor painting
> the screen which is done line by line. The interline sensor uses an
> electronic shutter and turns individual lines of pixels on and off in
> succession. It can run continuously by scanning lines from top to
> bottom and then starting all over again. The display circuitry can read
> these lines continuously and also paint them on a display screen
> continuously. This is what makes a live image or... video/movies. Note
> that if the frame rate is, say, 30 frames per second then the last row
> of the image was exposed 1/30th second after the first row. If the
> image is moving then there may be motion blur from the delay. Full
> frame sensors don't suffer from this problem and have fewer other
> drawbacks as well. The interline sensor's biggest problem is that the
> design uses a large amount of the surface area of the sensor for the
> shutter and read-out circuitry. The interline sensor may have only 25%
> of the available surface area to catch photons so they are inherently
> noisier than full frame sensors.
>
> Got the picture? If you want a live image you want interline. If you
> want a low noise, high quality image you want full frame. Can someone
> make a sensor with the qualities of both? They're trying but I don't
> think anyone has succeeded.
>
> Chuck Norcutt
>
> Candace Lemarr wrote:
>
>>
>> ----- Original Message -----
>> From: "Moose"
>>
>>>I'll try. The real time image you see on the LCD in A mode comes from a
>>>separate small sensor behind a partially silvered mirror in the
>>>viewfinder, not from the actual picture taking sensor, which is behind
>>>both the mirror and shutter.
>>>
>>>In B mode, the main sensor is working as a live view sensor. However,
>>>when you take a picture, the shutter closes, the sensor resets, the
>>>shutter operates at the selected shutter speed, an image is captured,
>>>and the shutter opens again with the sensor in live view mode.
>>>
>>>It's pretty clear that the sensor isn't capable of simply grabbing one
>>>of the live view frames as they go by.
>>
>>
>> Ok, that makes sense. Thanks for putting it simply :-)
>>
>>
>>
>>
>>>There are some tech reasons I
>>>understand, and some I don't, but lets just leave it that the current
>>>sensor can't do what is needed.
>>
>>
>> God bless you for leaving it there, LOL...I wouldn't understand it if you
>> told me more. :-D
>> Thank you, Moose :-)
>> Candace
>>
>>
>>
>>>Moose
>>>
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