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We own this lens for several years using it on Nikon F70. I was very disappointed with the over-all quality (esp. sharpness) of the lens. Tamron 28-200 lens is supposed to be also on the "lower" end of the quality scale - I tried it once and WHAT A HUGE DIFFERENCE compared to the 28-300. In other word: even the much critized Tamron 28-200 is better. Very likely a 28-300 even with reasonable compromise would unreasonably stretch the budget and perhaps the OEM of Vivitar (Vivitar does not have his lens factory) did the best they could for that money. I am curious, how good or bad is the 28-300 offering from Tamron. The Vivitar Series 1 IMHO does not deserve the "Series 1" name. I am affraid, in order to cover a long range with better quality one would still need 2 or even 3 lens.

It's all you need, great as a secound lens. Excelent for PRO and Amateur. Great value.