Originally posted by falconeye Well, how come you didn't check first if the K-x has the feature, then?
Using my own words: The K-x can not open and close the aperture, in a continuous manner, while the imaging sensor remains active, e.g. during movie recording.
It computes the aperture prior to the take and sets it to a fixed value just like for a normal photo. E.g., with "Auto" aperture and when shooting a video in a driving car, the K-7 will open up its aperture when driving into a tunnel while the K-x won't. The K-x will just crank up ISO and exposure time.
This explanation is weird, because other Pentax cameras, for example K-20 has liveview, which is mechanically same as taking video. In live view you just do not save the video flow from sensor. And K-20 do not need this bulge. So I dont believe your explanation.
So I do not undestand what is this "continuous manner" means. As far as I understand, K-7 aperture works jus as it has been working decades. And same manner as earlyer digital models. for example K-20 which is liveview capable.
So what exactly means "continuous manner"????
When lever or button or shutter release button is pressed, aperture stays closed until it is opened again. Time how long it stays closed, is determined by user or algorithms. What is different in K-7 and why this difference is needing an bulge into very same place other cameras have aperture actuator button?
And believe that I know principles of SRLs very very well.... be precise.