I've had my EOS for 2 years & it came with the kit lens & a also brought the tamron 70-300mm (4-5.6 ap) for £100 to start me off.
I've since gone on to replace my kit lens with something which is better built, better quality glass & quicker, but im now looking at the 70-300mm.
I know I'm not able to find anything "quicker" by way of aperture, but im keen to find a lens which is quicker to lock it's focus onto the subject & more accurately rather than "hunting" back & fourth. The main things I use this lens for are nature & aircraft - sometimes by the time the AF has locked on it's too late which frustrates me. I also think the quality of my images is suffering - not surprising given the £100 mark I got it for.
Does anyone have any suggestions? I'd be looking for second hand to trim costs (last 2 lenses have been second hand so happy with the risk & know what to look for when buying used gear).
Thanks 

