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Message: <blockquote data-quote="Duke Leto" data-source="post: 1763076" data-attributes="member: 35693">Barry you dont say which TC, I can based on actual usage state that I would forgo 80mm and go with a 300 & 1.4, whislt the 1.7 will work, when the light and contrast drops it will begin to struggle, the 300 and a 1.4 is not a bad pairing.But and theres always a but, for the price of a new 300/4 AF-s and a TC14e-II based on warehouse express prices @£1200 you may find a used Sigma 500/4.5 available somewhere, now thats a difficult decision, if you're not worried about the additional size n weight I would plump for the sigma, if you want a light small unit then its the Nikon.  When I bought my Sigma 500/4.5 I never really used my 300 AF-s except when I wanted something small on the car seat when I was driving around. Now I have a bigger and heavier lens the 300 is used more often such as out walking the dog etc (and always with a 1.4 connected)</blockquote>