goldenhusky said:
I wonder why almost all manufactures are stuck with 70-200 why not a 70-300 f/4L or 50-200 f/4L,.... some different focal length. I understand the front element size, overall lens size and weight might go up. The same goes for the f/2.8 why not try to make them f/2. Looking at history 80-200mm f/2.8L was replaced with a 70-200 f/2.8L why not do something like that?
They would get bigger and heavier, yes. But front element size for the ones you listed would stay under the 'reasonableness diameter' of 82mm or less. That wouldn't be an issue.
High FL multiple lenses...
1) Are not as sharp as lower FL multiple lenses. A 70-200 f/4 made with the same tech / tolerances / precision would be markedly sharper than a 70-300 f/4.
2) Start making people think they don't need as many lenses. Canon doesn't want everyone buying a 24-105 and a 100-400 and saying "I'm good. I'm all set."
I think that's why they have these 'protected buckets' of lenses: 16-35 / 24-something / 70-something ...so that folks will buy three instead of two lenses. (I own one of each of those -- how about you?)
For that reason, I strongly doubt Canon will ever make (say) a bucket-straddling 16-50 f/4, a 50-200 f/4, a 24-135 f/4, etc. It's not just size. It's about sharpness and dollars.
- A