- Jul 21, 2010
As I’ve stated (on multiple occasions already), it seems likely that you have a poor copy of the RF 24-105/4L. Compare Canon’s theoretical MTFs, the 24-105/4 is not worse than the 50/1.8, the L zoom is better. Actual production lenses will not be better than their theoretical MTFs, but certainly can be worse. From everything you posted, your 24-105/4 seems to be an outlier in its poor performance. If your 50/1.8 is better, there’s something wrong with your 24-105/4.The RF 24-105/4 was a huge improvement and I was really happy with it for 2-3 years. I have to say it's actually substantially worse than the 50/1.8, 100/2.8, 100-500, and possibly just better than the 16/2.8. I'm actually shooting the 50/1.8 as my main lens again. But, I think I am being pickier than I need to be.
You can continue to ignore my point, or you can send your lens in for evaluation/service. If you really want an improved 24-105/4, honestly that’s the best place for you to start.