My G.... You two Neuroanatomist and Rpt don't know the basic how a sensor works, collecting photons and if you are halving the time= go from 100 iso to 200 iso you are halving the amount of hitting light/photons on the sensor and the amount of read out electrons by half.
Seriously? Mikael, explain to us, step by step, how enabling HTP causes a change in the exposure time or the light/number of photons hitting the sensor.
Try this little experiment:
1. Set camera to M mode with HTP off
2. Set ISO 100, and set aperture and shutter speed to achieve a metered exposure.
3. Enable HTP.
Now, tell us - did the shutter speed change? Did the aperture change? If they did not change, how is the amount of light falling on the sensor any different?
I'm sure you'll point out that ISO changed to 200, and the meter shows a 1-stop overexposure. So, if you now change aperture or shutter speed by a stop to again achieve a metered exposure, that secondary change halves the light. But you did that, not HTP.
Now...that was in the very specific case of ISO 100. Repeat the above three steps, but in step two, set ISO 200 or higher. Did the shutter speed change? Did the aperture change? Try it again in P mode at ISO 200. Did the exposure change? Explain how in those cases, enabling HTP reduced the amount of light hitting the sensor. After you've explained that, please explain how a situation that arises in only a very limited set of circumstances, i.e. ISO 100 with an auto-exposure mode (Av, Tv, P) selected represents a general description of the 'mechanism of HTP'. After that, feel free to prove the general accuracy of that broken clock.
Or just ignore these questions, as you ignored dlleno's similar questions. Answering them would mean acknowledging your mistake, something you're evidently incapable of doing.