Focus on lenses

I feel that the next big challenge to companies like Nikon and Canon and Sigma is not cameras but lenses. In your Nikon Z 7 review (AP 13 October) you state that all IBIS systems become increasingly ineffective with longer lenses because they are too heavy for the image stabilisation to work well. The weight drags the camera down, so stable images are nearly impossible to achieve. I know this as I have a Sigma f/2.8 zoom with IS – with horizontal orientation it’s fine, but shoot vertical and the images are ever so slightly out of focus. Tiny light lenses like those in mirrorless systems would remove that barrier to photographers getting great blur-free images every time they shoot. I think we need to focus on lenses, rather than be camera obsessed. Martin Busby