Disclaimer:
1. I can only verify this works on the K-7 with firmware 1.03
2. This is not my own discovery, it's been based on findings of other forum members and my own experiments.
3. I have tested this on my camera only, others results may vary.
Even though Pentax has not allowed full manual control on the K-7 they have given us control of aperture and apparently so through either programming oversight or on purpose have left a back door to allow manual control.
I. How to get manual control?
1. Go into USER mode
2. Set the exposure program to Av (I have tested M, Tv, Sv, P and none of them work, it would align with my theory that the movie mode utilises its own perverted form of Aperture priority program.
II. Setting the exposure.
1. Once the upon is done, activate Liveview, preferably with the live histogram enabled, I also like to use the dark/light overlay to.
2. Dial in the desired aperture.
3. Dial in the desired ISO. (I believe based on my testing that 100-1600 is the most usable range, however someone else could further test this.
4. Setting the shutter setting is rather trickier, it involves aiming the camera at or away at a light source till you see the shutter speed at your desired value, ie 30, 60, etc and then hit the AE-L button.
5. Turn the dial to video mode and hit the shutter button, you will immediately see the AE-L symbol is still on the screen and your exposure is locked
as said above this only appears to work in Av mode in USER and no others.
III. Observations & unanswered questions.
1. You can see a clear difference in noise between locking ISO 100 & 1600, this is quite dramatically apparent when you have the dark/light setting enabled in liveview and you have the lens cap on.
2. I am still unsure of the limits of the shutter speed, ie how fast and slow can you lock it or does the camera automatically set the upper and lower limits of this. Further experimentation would have to be conducted.
3. Has anyone been able to pull EXIF data off K-7 videos yet?
IV. Email & Harass Pentax & Their Official Distributors For Proper Full Manual Control.
Last edited by Christopher M.W.T; 06-16-2010 at 10:42 AM.