Quote Originally Posted by Elox

The 70-150 seemed to be a love-hate lens. Way back when, Modern Photo gave it a good review and I have a friend who has one and loves it, but he gets great, sharp results. The one sample I tried was terrible and I couldn't get sharp results no matter what I tried.

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The Vivitar 70-150, was made by Kiron (Kino Precision Industries) and is usually very good. Kiron also made the Nikon E series 75-150, for Nikon, and it is highly coveted by Nikonians. I once did a side by side shoot with the Nikon E 75-150 version, and the Kiron 70-150 version, and the results were identical. Plus, the Kiron version doesn't get the horrendous zoom creep that the Nikon is known for.

Kiron Kid