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Old Mar 15, 2007, 3:49 PM   #1
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hello everyone,

I have some questions about my e500.

Why is there a 2x focal factor? (is it because the image sensor is smaller or bigger than normal?)

Why is the 4/3's system called the 4/3's system?

thanks
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Old Mar 15, 2007, 5:22 PM   #2
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Yes, it's 2x to get the 35mm equavalent because the sensor is smaller.

As for four-thirds name, this site will give you the whole four-thirds story and lots of other information about the format:
http://www.four-thirds.org/en/about/index.html

Here's another site that has more day-to-day using the camera information:
http://www.wrotniak.net/photo/oly-e/index.html
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Old Mar 15, 2007, 10:01 PM   #3
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digital sensors are smaller than the old film format
the size varies between manufacturers

Olympus and the four-thirds group sensor is 18mm x 13.5mm
this is roughly half that of 35mm film, so the crop factor is said to be 2x

conversley a Canon dSLR with APS C sensor is 22.5mm x 15mm
which is slightly bigger, and works out to be a 1.6x crop factor

while much is made about the difference in sizes, really there isnt a lot in it.

Riley
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Old Mar 15, 2007, 11:49 PM   #4
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Rriley wrote:
Quote:
digital sensors are smaller than the old film format
the size varies between manufacturers
That's not always true...some bodies out there have digital sensors the same size as 35mm film, and some have larger sized sensors (than 35mm anyway; digital sensors for medium and large format digital cameras).
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Old Mar 29, 2007, 11:05 AM   #5
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Mikefellh wrote:
Quote:
Rriley wrote:
Quote:
digital sensors are smaller than the old film format
the size varies between manufacturers
That's not always true...some bodies out there have digital sensors the same size as 35mm film, and some have larger sized sensors (than 35mm anyway; digital sensors for medium and large format digital cameras).
I think he was refering to the common DSLRs only
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Old Mar 30, 2007, 9:57 PM   #6
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However, the current parade of Olympus DSLR cameras still use the same 2X multiplier to get a realistic grip on the real focal length of the lens that you are using.Is that really a mystery? It is something that we deal with every day.

MT/Sarah
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