Originally posted by barondla Why couldn't you take the shot of the bird with the K10D?
thanks
barondla
It's simple really, I used an SMC Pentax 300mmF4 and 1.7x AF TC.
the 300mm F4 is not an automatic apature lens (no electrical contacts to tell the camera minimum and maximum apature)
As a result, you cannot use P-TTL flash on the K10D, it simply does not work with manual apature lenses (although I gave pentax a solution that would make it work they won't change the software)
In reality, yes with different lenses you could take the shot with a K10D, just not my lens.
The *istD has True TTL flash, which meters light reflected off the sensor during exposure, and does not need to know apature to meter the flash. P-TTL uses the wide open apature, apature information and a
Pre Flash, to meter the scene, then calculate the correct flash exposure.
Many claim it is because the sensor has a different reflection characteristic than film (and all DSLR makers use P-TTL or their form of it now) I think they did it to save a sensor and money.