[Buckster]

I'm looking for a lens which I can use for airshows, birding, and hopefully general other zoom stuff ....

Max budget is around 400 -500 pounds - so am considering the following, in prioroty of the top being what I'm thinking would be the best bet - could anyone give me some advice/feedback on any of these options/quality of lenses please.

Sigma 100-300 EX HSM + Sigma APO 1.4x TC (400 for 2nd hand lens + 70 for TCON)

Sigma 50-500 EX (500 2nd hand from shop, 350 2nd hand non-shop)

Nikkor 300 F/4 AF + 1.4x TC (370 +100 ish)


Why I'm thinking the 100-300 + 1.4x TC as top prioroty is I'm hoping the IQ would be up there with the 50-500 without a TC ? 50-500 as good as it is - would be a very big lens to use for anything other than airshows or birding.

Anyone used a 100-300 with 1.4x TC ?

Thanks, Mark.