I know that CMOS sensors appeared in the beginning of 90s, and evolved up to 2000s. I'm mainly talking about high ISO photos quality. For example, Canon 5D mark 3 has better results in high ISO tests ...
How are lenses and lens elements made? Also how are the lens elements and groups etc. arranged in the lens? In regards to the glass, are the elements ground, moulded or are there other techniques ...
I was considering buying a Nikon D7000 but I have found that (as of 2011) many reviewers were reporting back focusing issues. I would like to verify if these issues are real, and if they are still ...