Exact crop factor of K3 Sensor.

Anyone know, the exact crop factor of the 23.5mm x 15.6mm sensor in the K3, and no 1.5 won't do!
I need to know the exact value, my little brain won't wrap itself around that one today.
Got 1.53 in my head but that could be wrong of course...
Ta in advance...

Is it just the aspect ratio you want or the exact mm size?

The aspect ratio is the pixel size of the RAW files.

6016w x 4000h = 3.008:2 or 1.504x

The spec. also mentions 16:9 which I presume is a crop.


EDIT: If you mean compared to 35mm FF it's
36/23.5 = 1.532 OR 24/15.6 = 1.538 based on height
which is probably more accurate because 35mm was
usually cropped on the length when printing.
--

I always thought the crop factor was calculated as the diagonal of a 36 X 24mm frame ie 43.2666mm approx divided by the diagonal of the particular sensor you are comparing (APS-C 23.7 X 15.7mm is 28.4285mm approx). If so the answer is :-

1.5264180559885595966299171925376

Hope that's exact enough

You need to check your maths:

1.521944700786210

He He
I thought this would happen.
Anything official anywhere?

Jules

http://petapixel.com/2013/06/15/a-mathematical-look-at-focal-length-and-crop-fac...


http://en.wikipedia.org/wiki/Crop_factor

Resd that and that's what confused me...

Jules,
I think they use the diagonal measurement due to a throw back to the original TV Cathode Ray Tube days. As the original tube faces were circular the measurement of screen size was the diagonal of the largest 4:3 aspect rectangle that could be made from the tube face. It doesn't really make any sense these days but they've stuck with it. It would be far better to use the total area of the sensor in my view. The graphic in this I think is a far better illustration of sensor size

http://en.wikipedia.org/wiki/File:SensorSizes.svg

Bit like the FF debate then

No debate. Some people have them some people don't.

Best regards

I'm very curious as to why you like / need to know the exact crop factor :

Indeed, I would have thought that 1.5 is near enough for most purposes. Do tell.

I'm totally anal!

THEN NO ONES GIVEN ME A DEFINITIVE ANSWER EITHER WHICH IS DRIVING ME NUTS!

1.52?

How many decimal paces do you want?

jamieallen gave an answer - but with an incorrect calculation which I corrected. That is assuming the sizes of a 35mm frame at 36x24 and APS-C at 23.7x15.7 are exact and for example an APS-Cis not 23.7003x15.7002

Lucky for you so are Pentax

http://www.pentaxmedical.ca/en/education/procedure-room-videos.aspx