K-3 Mark III Buffer findings with and without crop

So there's been a fair amount of talk regarding the buffer and if crop mode allows more shots etc.
Well, I did some testing and the results are weird to be straight up with the findings.

I set it up so the camera would write to one card, I set it as jpeg to give the best results.
I then shot full bursts until the buffer was filled.
Here's where things got weird...

Full image (no crop) = 53
1.3x crop = 48
1.7x crop = 59

So, for some reason (that escapes me) using 1.3x crop will give the least amount of images until the buffer is filled. The actual shooting speed for the burst didn't seem to be any different between full image or either crop mode.

I started that thread, but it wasn’t about the buffer, it was about whether or not crop mode has an effect on the aperture in the same way that a TC does…
I guess it morphed into something else 🙂

Were you mentioning aperture as in a change of depth of field, or the amount of light getting to the sensor?
The crop and buffer was a seperate thing I've seen in various groups.

Light… as in a smaller maximum aperture.

It has a similar outcome.

The easiest way to think of it with a TC you are narrowing the FOV by use of optics with cropping you are narrowing the FOV by using less of the sensor.
(lest use a 1.4 crop scenario for ease) As for the light think of it this way with 1.4 TC you are reducing the light density by 1 stop but spreading it over a larger area that is twice as large. With cropping you are holding the same density light but only using an area that is half of the area of the sensor.
The amount of light for both are equal, for cropping you receive twice the density of light times half the area of the sensor 2x1/2=1 and for the 1.4 tc you have half the density of light times twice the area 1/2x2=1