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Science missions use 2mp CCDs mostly because of the sensitivity. The larger is the individual sensor ("pixel") the more photons it can absorb thus more electric
by kika 13y ago
Science missions use 2mp CCDs mostly because of the sensitivity. The larger is the individual sensor ("pixel") the more photons it can absorb thus more electrical potential it can generate compared to the noise level.
There's also technological barriers for creating large megapixel CCDs as opposed to CMOS. Large CCDs are usually created by "stitching" multiple sensors together, which increase their price as a square of the size.
You can shoot fullframe (35mm) camera at ISO 25600 and get decent results, but if you crank up signal amplification on iPhone to 25600 you'll get nothing but random color dots :-)
- hahainternet 13y ago> Science missions use 2mp CCDs mostly because of the sensitivity It would be foolish to suggest there was a single motivator for inclusion of a sensor. In reality it is a combination of our answers. Large sensors allows lower gain and better noise performance, enables smaller aperture use at acceptable sharpness, takes less resources to process, transmit etc. You're not wrong in mentioning it though. Although FF at 25600 is going to be piss poor even if it's Nikon / Sony. edit: corrected stupid misspelling
- kika 13y agoYou've got very high standards in image quality :-) Nikon D600 at 25600: http://www.imaging-resource.com/PRODS/nikon-d600/nikon-d600GALLERY.HTM http://www.imaging-resource.com/PRODS/nikon-d600/nikon-d600G... Not even close to "piss poor" in my book.
- ygra 13y agoThat's about the noise level and sharpness I have on my EOS 40D with ISO 1600. I think I'm going to cry in a corner a little. That being said, you don't go that high unless you're very desperate and the sensor itself can go up to 6400, the rest is software.