Originally posted by Tom M Sort of related, One thing that's a bit frustrating as well is the fact you lose so much flash functionality when using non-A lenses, or, full manual. I understand why but, I'd like it if I could tell the camera what aperture the lens is set to. You know? Set it on the lens and then enter in the camera what you set it to.
Tom
I have addressed this several times with pentax, but so far, no luck.
I have 2 DSLRs, and *istD and the K10D. The *istD has true TTL flash and works great with all lenses because it is taking reflected light right off the sensor.
The justification for moving to P-TTL is that there have been some claims that the reflectivity of the sensor is not the same as film. (I don't know all the details but, we are where we are...)
While you might be thinking great, I bought the wrong camera, you need to have a go yourself at pentax, and ask them the same thing I have been asking for. Specifically the question below:
For green button functions on K mount lenses, can the camera calculate the F stop when the flash is operating, by measuring only the change in light before and after the green button is pressed and not change the shutter speed.
This would allow the camera to calculate an F stop so that preflash works properly.