Im planning to update my camera lenses in the near future. I already own a Sigma 28-80mm macro lense which Im happy with. Its great for close up shots of planes but it doesnt do the job for those shots over distance. I've been around to a few camera shops looking but Im still not sure. I have a Pentax MZ-7 camera and was looking for a telephoto lens somewhere around 400mm+ zoom. One lens Im looking at is a Tokina 80-400mm lens with f4.5-5.6 for AUS$1095. I believe Tokina is a pretty good brand. Any other suggestions or advice?