1.3x shrinking

Anyone else noticed that 1.3x is shrinking over time? I did a search but saw nothing. Sorry for the lack of formating/table:

1D 28.7 × 19.1 mm 1.25x
1D Mk II 28.7 × 19.1 mm 1.25x
1D Mk III 28.1 × 18.7 mm 1.28x
1D Mk IV 27.9 × 18.6 mm 1.29x

It looks like the Mark IV is finally close to 1.3x. I know the differences aren't huge but it is an interesting trend.

1.6x was going down but recently went back up a tad. It wasn't quite the drop in size that the 1D II to III had though. These are all pretty close to 1.6x.


Canon EOS 10D 22.7 x 15.1mm 1.59x
Canon EOS 20D 22.5 x 15.0mm 1.6x
Canon EOS 30D 22.5 x 15.0mm 1.6x
Canon EOS 40D 22.2 x 14.8mm 1.62x
Canon EOS 50D 22.3 x 14.9mm 1.61x
Canon EOS 7D 22.3 x 14.9mm 1.61x

Literally splitting hairs with that math. .5 MM is very small.

The 5D sensor is 23.9x35.8mm. I actually wondered why no one got up in arms about not getting their money's worth...

toxic wrote in post #9748793
The 5D sensor is 23.9x35.8mm. I actually wondered why no one got up in arms about not getting their money's worth...

Didn't want it to compete with the 1Ds Mark III's 36x24mm Real Full Frame(TM). But seriously, the Mark II is the same size. I was just pointing out a tiny, though real 'shrinkage' in the "1.3x" sensor size over time.

hpulley wrote in post #9748716
Anyone else noticed that 1.3x is shrinking over time? I did a search but saw nothing. Sorry for the lack of formating/table:

1D 28.7 × 19.1 mm 1.25x
1D Mk II 28.7 × 19.1 mm 1.25x
1D Mk III 28.1 × 18.7 mm 1.28x
1D Mk IV 27.9 × 18.6 mm 1.29x

It looks like the Mark IV is finally close to 1.3x. I know the differences aren't huge but it is an interesting trend.

1.6x was going down but recently went back up a tad. It wasn't quite the drop in size that the 1D II to III had though. These are all pretty close to 1.6x.


Canon EOS 10D 22.7 x 15.1mm 1.59x
Canon EOS 20D 22.5 x 15.0mm 1.6x
Canon EOS 30D 22.5 x 15.0mm 1.6x
Canon EOS 40D 22.2 x 14.8mm 1.62x
Canon EOS 50D 22.3 x 14.9mm 1.61x
Canon EOS 7D 22.3 x 14.9mm 1.61x

That may be true but as I understand it the later sensors have "larger more efficient" pixels. Canon has found a way to eliminate the wasted space between pixels on the sensor so image quality goes up.

Gapless microlenses and such help get more light into smaller pixels along with other things improving the noise in smaller pixels but the overall sensor size of the 1.3x sensors getting smaller was my main point.

What?! My 5D isn't REAL full frame?! Interesting...

mikeassk wrote in post #9748751
Literally splitting hairs with that math. .5 MM is very small.

30 mm^2 less area on the Mark IV compared to the Mark II(and Mark I). That's the size of a 1/2" sensor