Letus

Marcos, I'll have to defer to your judgement. I have yet to get my hands on the 5D. As I stated previously, I'm seriously considering adding one to my lineup, as I do recognize it has some advantages. Regarding the Letus element, you make some astute points. However, I'm curious which Letus model you're using. I personally own the Letus Ultimate, which - from my experience and the reviews I've read is far sharper than the Letus Extreme. We're talking about spinning glass instead of vibrating. Likewise, the Ultimate is much quieter than the Extreme. With sharpness, I get excellent results when their is adequate light - but I haven't directly compared them to the 5D. Clearly, in a low light situation, using the 1.4 aperture on my Ziess 50mm is going to result in a sharper image than being able to get the same light level on the Canon at 4.0 or 5.6. That part comes down to the optics of the lens. My Letus ultimate is very quiet. But heavy! You're totally on the money there. As for the soft focus issue, I shot one feature with another DP who was using the Letus Extreme and Canon FD lenses. He didn't seem to notice, but his shots were never as sharp as mine (Ultimate with Nikon mount, Zeiss primes), and he refused to zoom far enough into the image to remove the vignetting on the edges. Additionally, the Letus has a problem with having too many parts. The back focus assembly can easily get loose, and if it has any give, the backfocus distance starts slipping, and this absolutely results in a soft image. The 5D may very well produce a sharper image than even a Letus Ultimate properly tuned - but it certainly will outperform a Letus rig that is not properly setup. I'm assuming that you used yours properly - but it definitely is a point in favor of the 5D - to not have to keep an eye on all those adjustments.