"The MTF drops away from the center, of course, but even at the very edges, the readings are still quite high.
Let’s compare it to the Sigma 135mm f1.8, which until today was the sharpest 135mm we had tested. In the outer 1/2 of the image they’re pretty even, but in the center half, the Sony GM is dramatically better, especially at higher resolutions."
Summary
"But as far as the test goes, the results are pretty simple. This is the sharpest lens we’ve tested. Period. (At last count, that’s out of 300+ lenses tested.)"
Sony E 接環的法蘭距是18mm ,接了接寫環後不論是不是有加倍鏡,鏡頭設計的成像距離被改變了,就只是隻變"長屁股"的微距鏡. CANON EF 接環的法蘭距44mm ,接了MB5 就變身成為法蘭距18mm 的Sony E 接環鏡,就算鏡頭先接了CANON EF環加倍鏡再接MB5,還是法蘭距18mm 的Sony E 接環鏡,在MB5後方再增SONY E環加倍鏡使用都沒有問題!