I'd like to buy a tele zoom (70-300, 100-300) and like to get an advice about manufactures TAMRON, SIGMA or even NIKKOR although my budget is about 300 $. I assume there must be no significant differences between them so is more interesting for me facts like robustness and alike ... Thanks a lot for your help. -- Eduardo Alarcon Phone : 34-913020900 Sybase Professional Services Spain Fax : 34-913028937