Quote:
Originally Posted by John K
Especially now that both this and the Canon 6D are being offered cooled:
http://www.centralds.net/cam/?post_type=product
From the data flowing around the net the A7s and Canon 6D should be very close.
Cooled however could be different story - lets see what happens in the coming months! |
In practical usage yes but in straight compare each other at high ISO I think the Sony is the king even better than the Nikon D4s and DF.
But probably for norma astro use ISO6400 is probably as far as you would go in which case not a lot of gain? If you imaged at ISO12800 or 25600 the differences would show as I believe the Sony is good up to 25600.
Also the full well depth is massive in the Sony - 157,000 electrons compared to 9 micron CCDs like the KAI11002 and KAF16803 which are around 105,000 that is huge. That may be the biggest gain as stars now should retain colour rather than the often seen white DSLR stars with little colour.
I read the pixel size of the Sony is 8.54 microns. That's similar to the 11002 and 16803 at 9 microns. CMOS have 40% of the surrounding area taken up with individual pixel circuitry and ccd does not have that.
Greg.