Makmut - my understanding of the physics of optics is that a faster 100-500 would have to also be
larger (diameter). That means it will be both heavier and a lot more expensive. When I got the R5m2
I didn't understand how much importance the extra dynamic range of the sensor would be. As in -
the R5m2 made my RF 100-500 better. Perhaps "better glass" might mean "better tech in the body"?