I was trying to find the weights of Mamiya RB67/RZ67 lenses - but that's nonsense, as these were, just like Rolleiflex SL66, focus by a bellow and a rail - no AF, no focus-parts , only glass and aperture, sometimes leaf shutter.
Well anyway even if we would find out all MF glass is lighter than the Sigma, it would not become lighter just by these facts alone. And I don't support the idea "FF like MF" just because of a fast and heav lens. In two weeeks I should know more.
The Fujinon GF110mmF2 R LM WR is already 1010 grams. In the Fuji-system an equivalent should be 135/1.8. Which is available from - Sigma.
Well anyway even if we would find out all MF glass is lighter than the Sigma, it would not become lighter just by these facts alone. And I don't support the idea "FF like MF" just because of a fast and heav lens. In two weeeks I should know more.
The Fujinon GF110mmF2 R LM WR is already 1010 grams. In the Fuji-system an equivalent should be 135/1.8. Which is available from - Sigma.