I have been shooting a lot of outdoor sports and I really need more reach. And, while I am a big proponent of getting closer I can't walk on water so that is pretty much out I am currently using the 50-200 and ec-14 with either a tripod or monopod. The 90-280 and 300 SHG are out of my price range. The only options I see are the 50-500 bigma or the ec20. I have heard mixed opinions on this, so I am not sure which is the better option. Bigma: big, heavy, somewhat soft. Not really 500, more like 440. Softer past 400. Hard to find. But some people swear by it. EC-20: softer than the EC-14, you have to stop down to f8 to get sharpness. Max of 400 with the 50-200. Smaller and lighter than the Bigma. Some people argue the 50-200 + EC-20 is sharper than the Bigma. Both combinations are not fast at the long end: the 50-500 is f6.3, and the 50-200 + EC-20 is f6+. I can easily shoot at f7+ most days with sufficient shutter speed so the fastest maximum aperture is not critical. If there are any other brilliant ideas I'd love to hear them. The 300 mFT lenses are too soft at the long end for what I want. Cliff notes. Buy the Bigma or the EC-20 to get at least 400 mm of reach.