Sorry, "long image" was supposed to be "long side"
Chuck Norcutt
Chuck Norcutt wrote:
> I knew about the arcane measurements of Vidicon tubes but thought I
> could trust an official Oly document on the size of the image circle for
> the 4/3 mount. But you are right. Despite text that says:
> -----------------------------------------
> (TECHNICAL NOTE: The fraction noted in these sensors refers to the
> diameter of the projected Image Circle, and not the diagonal diameter of
> the Image Sensor. The projected Image Circle from the E-1 system works
> out to be 1 and 1/3 inches, or more elegantly, "Four Thirds". See Figure
> 2 below.)
> -----------------------------------------
> If you actually refer to "Figure 2 below" you will see that the image
> circle is larger than but not much larger than the diagonal of the
> sensor. I'm sure I couldn't find the reference but I recall reading
> somewhere long ago that the 4/3 standard had an image circle large
> enough to to support a square image format the size of the long image of
> the current sensors. If true, that would make it about 25.5mm.
>
> Chuck Norcutt
>
>
>
> Moose wrote:
>
>
>>Chuck Norcutt wrote:
>>
>>
>>>This Oly page states that the 4/3 in the specification refers to the
>>>size of the image circle which is four thirds of an inch or 1-1/3 inches
>>> or 33.8mm.
>>><http://olympusdigitalschool.com/e-system_cameras/e-1/E-1_Digital_Camera_-_A_Closer_Look/index.html>
>>>
>>>The E-1 only uses 21.6mm of that.
>>><http://www.olympus-europa.com/consumer/dslr_7045.htm>
>>>
>>
>>Sorry to be late on this thread, but there is some significant
>>misinformation that should be corrected, in case it's still rattling
>>around in someone(s) head(s).
>>
>>The 4/3" figure refers to a now really arcane measurement of the size of
>>video sensing tubes. The actual usable area is considerable smaller.
>>Here's a more detailed explanation
>><http://www.dpreview.com/learn/?/Glossary/Camera_System/sensor_sizes_01.htm>.
>>
>>Moose
>>
>>==============================================
>>List usage info: http://www.zuikoholic.com
>>List nannies: olympusadmin@xxxxxxxxxx
>>==============================================
>>
>>
>
>
>
> ==============================================
> List usage info: http://www.zuikoholic.com
> List nannies: olympusadmin@xxxxxxxxxx
> ==============================================
>
>
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|