Quote:
Originally Posted by LewisM
I thought about the 533 but it’s not a lot different to the 8300 I suspect. Some but worth it?
I only use OSC so I am ok with that
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I'd say its a lot different. Its BSI (backside illuminated) sensor. So it has large wells for its size and 84% QE which is higher than any regular CCD. The KAF8300 QE is around 59%. No amp glow which is one of the more annoying aspects of some CMOS sensors. 3.76 microns is a good size for shorter focal lengths.
As to diffraction I thought that was a lens quality when you stop down too much. Perhaps it happens with small pixels. the 2.4 micron pixels on the 183 are fine with my RHA at 1159mm focal length. I find its quite sharp. I also find it tends to give rounder stars because each star has more pixels showing it.
It does however make it harder to focus. It takes me longer to focus with it.
3.76 microns is probably a better fit pixel size for that scope. The 183 would suit a widefield refractor better but I would want a large sensor for my refractor because I got it for wide images.
Also these CMOS sensors are usually more sensitive in narrowband than regular CCDs.
The ASI2600mc seems to be the one shot colour a lot want. APSc sized, same 3.76 micron BSI sensor, same 80+% QE, very low dark current and read noise. I've seen some excellent images from them.
Greg.