As the title says it all, what do you pro's suggest me to do?
I'm currently shooting the 100-400 mm IS on 50D, and am more or less satisfied about the results (aviation spotting), but as it has had its best time I'm looking for an alternative.
Both the 300 mm and 400 mm primes crossed my mind, but I miss -or mm for the 300 mm or IS for the 400 mm- .
So, would it be wise to buy a 400 mm prime f5.6 non-IS, or 300 mm f4 prime IS with extender now.. or just keep the 100-400 mm IS a bit longer until rumors become reality at an affordable price tag (max would be $3000)?
Note: I love playing with the photoshop elements 'cropping tool', so which one gives the best results for some heavy cropping?
Thanks for your help !