User Activity

hello i have a friend who can sell me an sigma 150-500mm for $400 and just wondering if any of you have experience with this lens af wise and how sharp are the images compared to the 100-400 canon kind regardss josh
looking for a new telephoto for bird and sport phohotography but cant afford any L glass yet. what are your faviourte non l telephotos any suggestions will be much appretiated 
what are your thoughts on when the 7d mark ii will be released there has been heaps of speculation lately.just wondering on your opinonking regards josh
hey guys,i am being given a 30d for free and was wondering if it would be possible to change the sensor to a newer better one like the 40d or 50d and or put in a new processor digic 4 etc??hope to hear you replies kind regards josh