I'm not sure you have understood my point. My point was essentially that new more sensitive sensors are not necessarily better for our application because they are not designed for our application. This is true for the 428/828 AND the 285/825...or any other so-called "drop-in" replacement Sony comes out with. How the new sensor will perform in long exposure and high gain applications is simply a crapshoot. I do not understand yours or CCS_HELLO's statement about needing to redesign the readout circuitry to get a clean noise free image using the new chips. The amplifiers add noise to the image, sure, but they add random noise...static. They do not add fixed pattern noise other than indirectly through their heat being observed by the sensor as ampglow. The two patches of glow and the stringy lines in the dark frame I posted has nothing to do with the readout and amplifier circuitry, it has to do with the chip design itself. The high gain of the camera is amplifying the image defects that exist due to the chip, making them more visible. There is nothing you can do to re-optimise your read-out circuitry or gain settings and get the SAME camera sensitivity but without the fixed pattern noise. I don't make this sh$@ up, its just the way it is. If you used this chip in a camera with a mechanical shutter (ie. an imaging camera), the camera could automatically take darks and auto apply them unbeknownst to the user...but that is a whole other ball of wax.
This whole thread reminds me of a similar discussion a year ago when another 'expert' was discussing the merits of a new camera (the LN300) vs. the established mallincam. The difference is that Matt actually put his technical expertise to work and started AVS which is now producing cameras in competition with Mallincam. In turn this turned up the pressure on Rock and he released more products in competition. This has had a tremendous improvement for consumers of astro video products. I applaud Jim for actually conducting tests and publishing his findings here. There are other so called 'experts' out there so why don't they start a new product to showcase their aptitude and thereby benefit the rest of us with more advanced imaging products? Ultimately, that is what I deem the final word in these types of discussions. Put it up there and prove it by your actions not through obfuscating techno babble. Jim is proving it right now. The new chip like he says is optimized for faster exposure settings which of course makes perfect sense given the broad consumer market that Sony is trying to address given their poor business outlook for their imaging business. So many posts and the conclusion seems obvious. This new chip is dead on arrival for use in astro video cameras. Maybe point grey or someone else will utilize this chip for faster imaging purposes like planetary/solar work and for that it may indeed be a great new product. But for long exposure faint fuzzies... well seems like its a dud.
Al in NYC