Canon Announces That New 500mm and 600mm Lenses Are Now Shipping

UPDATE: B&H is now offering both of these lenses for pre-order.  They typically only do this when things get relatively close to arriving. Finally!!  After many delays, the lenses that were announced more than a year ago are now “shipping to selected dealers in Europe” according to Canon CPN.  No word yet on N.American dealers but I would expect to hear any time soon.  This comes just one day after hearing that the first of the Canon 1D X cameras are also starting to ship to select photographers covering Euro 2012 and the London Olympics.  Is Canon finally getting back

Battle of the 300s. 300mm F4 IS Vs. 300mm F2.8 IS

This past winter I decided to purchase a 300mm f2.8 L IS.  My dream lens.  At the time I was using a 300mm f4 L IS to shoot skiing with and whilst I was never disappointed with the quality of the shots from that lens on its own, I wanted to see a little more from it when used with teleconverters. After buying the 2.8 I still had the f4 for a couple of weeks before I sold it on so I took the opportunity to shoot a few tests to compare the two.  Details of my testing were as