ChrisC
Established
.... seriously considering this ZM 35mm f2.8. Has anyone had a chance to compare it with the Voigt 35 f2.5 .....
As suggested earlier, the light falloff from the CV f2.5 is significantly worse than the C-Biogon. I am selling my CV because it has been replaced by a C-Biogon; the Zeiss is a far better lens than my CV Colour Skopar copy. The Zeiss resolution at all focusing distances improves upon the CV, the more-even illumination is an excellent bonus as is the flat focus plane, flare resistance, and absence of focus shift.
The C-Biogon is a diamond of a lens and for me is the 35mm 'M' platform first lens of choice --- it's that good. On a related issue, Forum obsessions with ultra fast lenses sends a poor message to lens designers because there is a place for optimal lens designs which necessitate a slight loss of maximum lens speed [reminder -- Coastal Optics 60mm f4.0]. The C-Biogon is a fabulous lens and I for one am glad the designers made it an f2.8 lens rather than compromising it's splendid performance by making it faster.
Regarding the 35mm Colour Skopar, it's mall size and light weight make it a joy to use, I happen to like it's screw in lens shade, and it's functional focusing tab. However it will be sold as there is no cicumstance where I would use it rather than the C-Biogon. The CV served me well but my C-Biogon is a lens-for-life.
............. Chris