Dan, your comment on "Friends don't let friends use "effective" ineffectively." reminds me of my nearly constant rant ( in real life I consult to health care entities) that effective must precede efficient - there is no such thing as an efficient ineffective process, care guide, etc. The only way to make efficient something that is ineffective is to stop doing it.

Back to the post - why is the f-stop jumped to 16.4? the f-stop doesn't jump when we take our FF lens and stick on a crop sensor? What am I missing?