PCousins wrote in post #17993453
At 300mm there is no doubt the Prime will be better for speed and sharpness, At 300mm on the zoom the aperture will be f/5, yes the zoom has the flexibility but at 300mm ONLY the Prime will win all round hands down.
Actually, there is doubt. While I don't own the 300mm f4 anymore, I do still have the 400mm f5.6 prime. The new 100-400mm zoom is sharper than the prime. The zoom's autofocus is also faster to acquire focus than that of the prime.
Why do you think that the sharpness and AF ability of the 300mm prime is better than the new 100-400mm? Is this based on fact or experience, or is it just based on supposition?
St Bernard wrote in post #17993405
Looking at both lenses for general use photography. How does the 300mm L lens compare to the 100-400 lens at the same focal length at 300mm? Is the 100-400L better than the 300L at the 300mm f/l?
Comparing both lenses at the same focal length involves two factors that can be significant, depending on what you are shooting and how you are shooting it:
1: The zoom has the latest generation of 4 stop image stabilization, while the prime has a very old generation of IS that gives you one and a half stops.
2: The minimum focus distance of the zoom is 3.2 feet, while that of the prime is 4.9 feet. And of course the zoom can focus at 3.2 feet not only at 300mm, but also at 400mm. The difference is HUGE if you are into photographing butterflies, bees, lizards, leaves, flowers, etc, etc, etc.
St Bernard wrote in post #17995103
I think after doing allot of reading and the response here I will get the new 100-400L IS USM II. I have a new Canon 80D also. I have a EF 1.4 III extender now that should go fine with the 100-400 when I get it. It looks like a no brainer getting the 100-400 Lens. Thanks to all that left feedback appreciated. Bill
You're right; it is a no brainer. Great decision - I think you will be extremely please with the new 100-400mm.
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".