xps wrote:QuoteI tried it with the 3 and 1V on an bird photographer workshop. Wow. this lens is great. lighter than the old version and with an fast AF.
Are you refering to the Canon 500mm f/4 IS ver I? It is my understanding that the 500mm f/4 IS ver II is not available for purchase yet. If you want to buy the ver I of this lens, purchasing new is very unlikely and finding one used is also difficult and expensive.
The 500mm f/4 IS with the 1.4x extender (III or II) will autofocus with the 5d III and the 1D X and will give you a 700mm FL and a more than capable bird lens.
Yes, i tried the Ver. 1. The new Version I was onlay able to take one shot and to hold it.
700mm ist not enough with an FF camera. The birds I´m looking for, aer very shy. So it´s very difficult to get a good shot.