Ive just received a Canon 70D as a early present for my birthday from my Dad and my recently passed mum. The deal always was id get the accessories and the telephoto i need. I got the kit with the 18-55mm STM lens. Im good with a 18-55mm as thats pretty much my go-to from my Sony NEX5n that I'm graduating from. I need a good quality, but inexpensive, but not cheap, lens for Motor racing long shots as I'm away to the Italian GP in September and want to take it with me. I also like to use a telephoto for extreme long range shots for aircraft that go overhead as I like to watch planes on occasion. I cant afford the lenses in the £500+ mark. I need to get the telephoto, the list of two I'm looking at are as follows: Canon EF-S 55-250mm f/4-5.6 IS II Lens Canon EF 70-300mm f/4.0-5.6 IS USM Lens If i need longer for some shots i can get the extender tube later on. Its my first foray into a fully fledged DSLR, not using a 'bridge' or 'point and shoot' camera. Thanks in advance.