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Old Feb 16, 2007, 8:46 AM   #1
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Has anyone tried this combination? I'm trying to justify buying the 300 F2.8 and 2X extender. The 2X will be used on the 70-200 and the 300. If these combinations work I'll retire my 300 F4. I was thinking of the 400 DO andusing my1.4 extender but have pretty much given up on that idea.

All advice is greatly appreciated.

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Old Feb 16, 2007, 9:46 AM   #2
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I use the 1.4x on my 70-200 2.8L and it works fine except for a slight vignette at
the 200mm end...Not a problem for me because I like the effect on some shots...It
it messes up the shot, I crop it out...I say this about the 1.4x because I am sure you will get the same effect with the 2x....

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Old Feb 16, 2007, 10:05 AM   #3
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I have used that lens configuration on occation and had good results. When using a 70-200 off hand like at a crowded zoo it is easy to stick a 2X in your pocket. I have difficulty telling the shots I used the 2X and those I did not. No degradition at all.

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Old Feb 16, 2007, 1:26 PM   #4
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for my money, instead of the 400 f4 DO for about the same price you can get the 500 f4 L. Just my 2 cents. They are both really expensive lenses, which I could afford either.
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Old Feb 18, 2007, 6:06 AM   #5
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killdeer0007 wrote:
... If these combinations work I'll retire my 300 F4...
This is going to be controversial, but i'm going to lay it out for you anyway
-> An f/4 lens is in general always sharper than an equivalent f/2.8 lens of the same focal lenght (i.e. less complex to design and the light path is less oblique resulting in higher contrast)

You can verify the MTF's results of the Canon 70-200 f/4 vs the 70-200 f/2.8, the Sigma 100-300 f/4 vs the 120-300 f/2.8. This is no different with the Canon 300 f/4 vs the 300 f/2.8:

BTW they also recorded the 300mm f/2.8L results with a 2x so you'll know relatively where it'll stand against other lenses
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Old Feb 21, 2007, 10:43 PM   #6
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Kildeer, I have the F2.8 300mm and have used it with both the 1.4 and 2.0 Canon extenders with great results. Autofocus works with both although slightly slower with the 2.0. I also have the 70-200 F4 lens and also have used both extenders with it, however with the 2.0, results are not nearly as good as with the 300mm. The faster 300mm is just a supurb lens, not only for sports but also a great portrait lens where blurred background is desired. I believe you will be happy with the lens whatever task you assign to it.
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