Originally posted by Solaire Why wouldn't they? Why would the SR reset the sensor's position after each exposure? It can keep moving. As far as I know the sensor can travel for 5 minutes with the stars, so you can have 4x 1 min 15 sec exposure.
I am with Adam.
The O-GPS1 ist an ingeniuos little flexible tool. I like it but my personal experience in making astrophotos and using Astrotracer is, that O-GPS1 must be far to inaccurate to reach the precision needed to perform the pixelshift technologie successful.
The internal camera software calculates the necessary sensor movement to compensate relative rotation of the stars. To follow the stars on a "very few pixel" scale a very exact 3-D knowledge of camera position and very very very exact knowlege of the azimut and inclination of the viewaxis of the lens is essential. Because the orientation data for the calulations of the compensatory (to star movement) sensor movement are acquired via unreliable acceleration sensors and "internal magnetometer" in my opinion it is impossible even to get near to the precision needed to successfully adapt the new pixelshift technique to astrophotograpy with Astrotracer.
I would expect that the necessary precision could only (if ever) be achieved if the new K3 II was be attched to a very good equatorial mount system that is perfectly aligned to the rotation axis of the earth. But in astrophotography besides getting optimum focus the main challange is not to upgrade resolution but to optimize the signal-to-noise-ratio. This is mainly achieved by catching as many photons as possible in a maximized exposure time to get good "signal" and by stacking the single frames later to reduce noise. The idea to quarter the given maximum exposure time to perform a pixel shift in my eyes would foil these efforts.
---------- Post added 04-28-15 at 11:39 ----------
The moon at 1/100 seconds or less or the sun at even shorter exposure (with appropiate filter of course) may be fine targets for the pixelshift technology. They do not require tracking as a must and high resolution would help with the relatively short focal lengths of camera lenses to get better crops and bigger images.