09-11-2020, 06:01 AM
(09-11-2020, 12:32 AM)borisbg Wrote: Klaus, thank you for reviewing this lens! Great option for birds and the price is reasonable.
On the specs did you mean 618mm? It shows 318mm.
Multi-element telephoto lenses are never as long as the focal length is. Long-focus lenses, which predate telephoto lenses, were about as long as the focal length. Only Pentax has made an old fashioned long-focus lens the last few decades, in the Pentax HD DA 560mm f5.6 ED AW, which measures 521.7mm according to the manufacturer.
For this Sony, 318mm is correct.