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The Pentax K1 is a mainstream camera release and is not an astrophotography targeted camera.
Its a full frame DSLR for popular use.
It happens to have this astro tracer function which is ideal for nightscapes and for those using Vixen Polarie mounts.
As far as the sensor even though its an older Sony 36.4mp Exmor sensor its still light years ahead of anything Canon has. Exmor can give clean shadows that you can boost with no noise unlike competing Canon sensors (Canon is getting better though but Sony is surging ahead leaving them further behind).
Pixel size? It seems counterintuitive but each new gen of DSLR/Mirrorless seems to get more pixels and lower noise. The Canon 50mp 5DSR has better noise than 5D3. So manufacturers look for ways to improve the sensor, get more megapixels and lower noise so high ISO is less noisy.
Full frame sensors are 2.5X larger in area than APSc so 36mp full frame would have larger pixels than 18mp APSc.
This Sony 36mp sensor is a gem, I have used one in 2 different cameras now for 3 years. Awesome.
Sony has done this by using thinner copper wiring instead of the usual aluminium giving faster cleaner readouts plus it can make the sensor stack thinner which allows more light into the same pixel, by using back illuminated sensors, by having the analogue to digital converters on the chip itself and other electronic tricks.
Greg.
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