AF confirmation Chip (dandelion ?)

Hi,
I own some of the above chips mounted on various adapters (Eos? M42, Fd-Eos, Eos-Yashica) but I had never tried to program them to set aperture, focal length etc.
Some days ago I tried to programm following the instructionI I found on the site of the inventor (?), which is a Russian site, but also those found in other sites....

Underexposure

I recently noticed some of my shots are underexposed. I am using the Canon 5D Mk III and several different lenses has anyone else noticed this same problem. Thank you in advance for any help.

5D mk II VS 6D

Hi guys,

Do you think that 6D could be an update to 5D mk II? I know all the techincal differences between them but 90% of my shoots are done in studio conditions. I only care about the noise performance of 6D's sensor which is a lot better from 5D's sensor. I don't need 1/8000 shutter speed. If it will give me the same result as the 5D...

Old 70-200mm 2.8

Hey Guys, I lately purchases an old (over 15 years) 70-200mm 2.8 L, the glass is perfect with no scratches but I was concerned after a shooting that I had that I couldn't get sharp pictures (Little blurry) and I don't know if it's cause by the weight and the shakes or does the aging affect the lens quality.