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Old Jan 20, 2007, 8:35 PM   #1
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I had a chance today to try the Canon 500 mm F4 today. There is no doubt that it is an excellent lens - the only problem is the weight. I like to hike around looking for birds. Since the reviews on the 400 DO are quite mixed, I was wondering if the 300 F2.8 with a 2X extender would be sharper than the 400.

Any thoughts?

//jim
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Old Jan 20, 2007, 9:46 PM   #2
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u will get atleast three votes for sigma 120-300 f2.8 if ur considering 300 f2.8

vj
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Old Jan 20, 2007, 11:22 PM   #3
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Well according to Canon's own MTF the 300 f/2.8 is near perfect and the 400mm DO doesn't look as sharp (even when closed down to f/8 ):

300mm f/2.8 400mm f/4 DO

-> You only need a 1.4x for the 300mm to exceed (i.e. 420mm) the DO in reach - With a 2x it'll bring the 300mm to 600mm which is what most us are doing with the Sigma 120-300 f/2.8

Are you comparing it to the DO with a 1.4xTC which is still shorter @ only 560mm? IMO the 300mm f/2.8 wins hand down even in cost! :idea:




killdeer0007 wrote:
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I had a chance today to try the Canon 500 mm F4 today. There is no doubt that it is an excellent lens - the only problem is the weight...
It may be heavy, but the 500 f/4 has a silky smooth 'Bokeh' which I don't know if you can get with a DO (and a 1000mm reach with a 2x on a 1D MrkII):



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Old Jan 21, 2007, 1:03 AM   #4
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Thanks NHL

I already have the Canon 1.4 extender and was thinking (hoping) that I could get a bit more reach with the 2X without losing too much quality. Is that being unrealistic?

//jim
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Old Jan 21, 2007, 2:35 AM   #5
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NHL

That is one stunning picture.

at 1000mm the bokeh is surreal....beautiful capture...every penny worth it for that amazing lens

vj
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Old Jan 21, 2007, 6:50 AM   #6
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killdeer0007 wrote:
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Thanks NHL

I already have the Canon 1.4 extender and was thinking (hoping) that I could get a bit more reach with the 2X without losing too much quality. Is that being unrealistic?
Not at all - I use a 2x on my 120-300 f/2.8 all the time and the Canon prime should only do better especially at the corner with an MTF like that!

PS for comparison the DO is quite similar to your 300 f/4 in sharpness, but when closed down to f/8 the 300f/4 still win over (with the higher blue curves):

300mm f/4L 400mm f/4 DO

-> So when you add a TC to the DO it still fares not any better than another lens with a TC... :idea:


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Old Jan 23, 2007, 8:01 PM   #7
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get the 300 f2.8. u will br very satisfied!!!!!!!!!!!!!!!!
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Old Jan 25, 2007, 12:56 PM   #8
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Thanks everyone.

Bookerreese have you used the 300 with the 2 X Extender?

//jim
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