Xenar vs Tessar... no advantage either way. It's up to the quality and optical centering of your particular lens. Both are good lenses computed by the giants of lens technology. Same for Planar vs Xenotar. Things like number of aperture blades can have an impact but it's going to be a tie optically on a general basis.
Xenar/Tessar vs Xenotar/Planar, the planar type is going to win at anything wider than f/8. The tessar will be sharp in the center, but the Planar will be sharper and have much better edge sharpness. On the other hand, the Tessar won't be bad at all. It was the top of the line for decades, aside from maybe the Heliar type, and produces usable results at all apertures.
Last edited by PaulMD; 01-27-2012 at 02:18 PM. Click to view previous post history.