I love Vivitar Series 1 images, but it's so hard to find any on the web. Most of the lenses seem to be in the hands of old men who are essentially museum curators! Your pictures are fantastic, and this is my favourite of the wide-open-aperture pictures.
It would be great if you had a look at mine, which can be found by searching for the character string "series1vivitar" in tags. I think the link below should get you there. thanks, jamie