Question 1. Multiple Choice (mark all that apply)
The lack of IS in this lens at this price is caused by:-
a) Canon have found the upper limit on image quality possible with image stabilisation using what is, after all, a wobbly lens element held in place by motors and springs and for this lens chose to tie the glass down tightly?
b) Canon don't want to kill any remaining sales of the 24-105mm f4 IS, which has been around for a while and has nicely paid back its investment already?
c) Canon found they had sufficient image quality to do serious damage to the the L- prime lens market if they put this lens out with IS, because then only the bokeh-chasers would have any use for the big f1.4s?
Question 2. Short Answers
Discuss your answer to Q1, illustrating with visual aids, MTF charts, WTF charts and stuff pasted off the web as appropriate.