Originally posted by Clem Nichols I find the information contained therein more confusing than enlightening, because there seems to be absolutely no correlation between the times listed in the German magazine and those listed by Imaging Resource.
The info from the German magazine were compiled by myself so I may be able to provide some bit of extra information.
I am still confused myself.
Originally posted by RaduA The discrepancies are due to:
- different lenses in those 2 tests (DA 18-55 II in the German test and Sigma 70/2.8 Macro for imaging-resources);
- most likely different methodologies: ColorFoto could defocus the lens to infinite and refocus by AF to a target near by and i-r.com most likely uses a more closer approach to reality by focusing from min position to a target near by.
Ok, here is the extra info:
- Focus is from infinite (1000x focal length
) down to 1.5m
- Delay is measured with 10ms accuracy, from shutter press to captured image
(the target adds one bright LED every 10ms (starting the moment the trigger is activated) and the delay is determined by simply counting them on the captured photo -- so no detection of focus confirmation beep or mirror movement).
[Source:
Google translated ColorFoto test methodology]
In my own tests, I could measure delay times more in line with the ColorFoto numbers (however, my own number is more like 400 ms, not 300 ms).
I don't trust the i-r.com figures. They are inconsistent and look like some of the numbers I got when the subject was already in focus. I decided to ignore them.
Even the ColorFoto figures will have an error margin of at least 100ms or so, as is visible from the faster K20D figure whch I cannot confirm.
Originally posted by Clem Nichols my inability to read German prevents me from digging into their article. IMHO the figures shown in Color Foto are probably more realistic than the ones in Imaging Resource which shows the K7 with a full AF shutter latency of 93 milliseconds and the D300 with a latency of 227 milliseconds.
+1