Well, my German is non-existent. Even though my grandparents immigrated from Germany (clipper ship around Cape Horn) and spoke German, my father thought that Spanish was a better choice while growing up in California.
The examples above were taken quite by accident. Rather than try to time the best shot (really going for stills), I just put the camera body (K5IIs) in continuous shooting mode and locked down the external shutter release as the planes flew overhead on their landing approach, in order to capture a large amount of shot so I could select the best one later while post processing them. While post processing them, I noticed that they made a really nice "stop action" video - so I processed them using Picassa into a video sequence. When viewing the video in real time, it was very apparent that, as the plane as it was making its decent for touchdown, the sequence of individual stills was interrupted for a period of time, and then subsequently resumed. The interruption does not show as an "interruption" in the video sequence, but shows the plane suddenly "dropping" in its flight path. This "drop", is when the buffer is full, and no additional images are captured while the buffer is being cleared and reset, followed by the resumption of image capturing.
While shooting sequences a couple of days later, you could hear the shutter click off at about 7 frames per second, a string of 20+ images and pause, then subsequently resume. The real aim was to collect RAW stills as opposed to JPGs. Also, the "video" is just a fortunate happenstance from sequencing through the individual single images, and seeing the "discontinuity" of the plane's travel trajectory. What I found was that - from memory, that the K5IIs holds about 22 full size raw, but with the lossless compression, and depending the individual shots (and how they compress), I can get about 29 +/- before the buffer fills.
I have quite a number of image sequences from several outings at the end of the runway over the last year or so. It's pretty evident that the buffer is just linear, and when filled does a clear & reset, prior to resuming. Imaging Resources has observed the same performance characteristic.
Also the characteristics of the continuous shooting buffer performance is illustrated in the Forum's review too. This link notes differences between the K3 and K5IIs in terms of the buffer processing times. It also notes differences when different performance levels of SD cards are used.
The K5IIs writes at 30Mb/s. The initial SD card I was using (Transend SD HC 32GB), had a write speed of about 20 MB/s. I picked up a couple of faster SD cards (both SanDisk Extreme PLUS) - one with a write speed of 45 MB/s (32GB
HC I) and the other with a write speed of up to 60 MB/s (64GB
XC I) - as I needed a couple of new cards anyway. I was expecting the potential of a larger number of images written to the card before the buffer was cleared.
Both of these cards performed somewhat differently. Actually, I was able to have fewer images written to the card before the buffer was cleared (makes little sense - but it is what it is). Each was freshly formatted.
This is what leads me to conclude that the continuous shooting buffer management is very "linear", followed by clearing/reset, rather than circular, where the buffer management is done with pointers when an image is both inserted into the buffer, and when an image is removed after being written to the card. A circular buffer by its very design would have a very uniform performance, along with being able to temporally cycle through a substantially larger number of images before having to limit/curtail insertions due to being full. Also, by significantly increasing the rate of the SD card to accept data, beyond the rate that the buffer was being filled at. If the buffer was circular, then we would never encounter a buffer full condition (given that everything else being equal).
Last edited by interested_observer; 10-11-2016 at 12:18 PM.