G
Guest
Hi all,
I've just flicked through the photodo.com MTF measurement results for my brand-new Vario-Sonnar 1:3,5-4,5 28-70 and my older Sigma UC Zoom (same nominal characteristics). To be honest, I am a little bit surprised that the DM 250,- Sigma lens beats a DM 1500,- Zeiss lens in terms of overall MTF performance. I experienced that the Sigma produces pretty bad vignetting at 28mm wide open, which is the main reason why I bought the Zeiss. I usually take slides, and I think that the Zeiss Zoom produces nicer colours and better contrast.
And, of course, the Zeiss has a much better and sturdy feel to it. But anyway, can anybody think of a reason for the Sigma's better MTF values as published at photodo.com?
I've just flicked through the photodo.com MTF measurement results for my brand-new Vario-Sonnar 1:3,5-4,5 28-70 and my older Sigma UC Zoom (same nominal characteristics). To be honest, I am a little bit surprised that the DM 250,- Sigma lens beats a DM 1500,- Zeiss lens in terms of overall MTF performance. I experienced that the Sigma produces pretty bad vignetting at 28mm wide open, which is the main reason why I bought the Zeiss. I usually take slides, and I think that the Zeiss Zoom produces nicer colours and better contrast.
And, of course, the Zeiss has a much better and sturdy feel to it. But anyway, can anybody think of a reason for the Sigma's better MTF values as published at photodo.com?