05-19-2016, 08:04 AM
Please remember
- on the EOS 5Ds R the practical peak resolution is around f/4. Thus the Tamron is already beyond that especially at the long end
- the MTFs decrease due to air diffusion starting to kick in at 300mm. At 600mm this costs probably "a half mark"
- of course, 600mm prime lenses will be better so it's just unrealistic to expect wonders from a lens that is this affordable
- on the EOS 5Ds R the practical peak resolution is around f/4. Thus the Tamron is already beyond that especially at the long end
- the MTFs decrease due to air diffusion starting to kick in at 300mm. At 600mm this costs probably "a half mark"
- of course, 600mm prime lenses will be better so it's just unrealistic to expect wonders from a lens that is this affordable