Long, long time ago, when some imagined a mirrorless camera (or something similar) would be a great solution I was looking for perfect, affordable and fast zoom for my Olympus E-3.
One day I've found online a promising Zykkor Auto Zoom 35-70 mm 2.8 lens for Olympus OM system. That time zoom with constant aperture at 2.8 was a really nice thing. It didn't even bother me that I'll have to use (focus) it manually.
It's a classic "pump" zoom with one ring for zoom/focus and second for aperture. Focal length of 35-70 mm on (Micro) 4/3 sensor gives an equivalent of 70-140 mm, which seems to be a perfect portrait lens.
Zykkor MC Auto Zoom 35-70 mm 1:2.8 [OM bayonet]
