Doug's quote is from the 50D Help Me thread.
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The 50D is great for flight Jay. Image quality issues aside, it has the best AF for flight of any Canon body IMO. As Tim points out, you need to get the bird fairly large in the frame for good image quality with the 50D (and with most other cameras for that matter). That's why I'm not a big fan of spending a lot of money on a 300mm lens for birds. In most situations, you are either forced to use a 2x or must crop significantly.
You said you are not a big fan of the 300 f/2.8 because you either have to use the 2.0 or do a big crop.
In post #27 of Kobus' 50D thread, I asked the following because I still do not understand the great draw to the 500 f/4.
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I ask because on the one hand I am considering the 500 f/4 which would be limited to the 1.4 = 700 + crop factor = 1120 and I am wondering if the increase from 960 to 1120 (assuming my math is correct) justifies the added expense, physical length and weight to spend an additional $1,700 over the 300 f/2.8 for the 500 f/4.
Doug, most of the time are you using AF or MF, and if AF you have only gained 160mm. Agree?
If you recall, before I bought the 300 f/2.8 there was a specific thread regarding the 300 f/2.8 and the 400 f/4 DO: http://birdphotographers.net/forums/...ad.php?t=34456
Some of the comments in that thread indicated that the 300 with the 2.0 extender is a sharp lens.
Chas Glatzer: "...it is sharper and with greater contrast, lower in cost, and extremely sharp with both 1.4 and 2x converters."
Ed Vatza: "...I do have the Canon 300mm f/2.8L IS and it is one remarkable lens. It's as sharp as you'll ever want. And I use it with a 2x Canon teleconverter much of the time. All I can say is that I have never once had image quality come up in a critique of an image made with the 300 and 2x."
Roger Clark: "I am very impressed at how sharp the 300 f/2.8 lens is, even over the 500 f/4."
So, as someone who travels and lives out of a suitcase 6 - 12 months at a time (next trip is 7 1/2 months) I opted for the 300 because I do not understand why the 400 or the 500 would be better when the 300 is at least for some very ably HH (not yet for me :o - Jim I am looking forward to those lessons) making it longer than the 400, and only 160 shorter than the 500 when both lenses have TCs.
If it is only an increase of 160mm when using AF, Doug, can you or anyone that uses the 500 share why the 500 is preferred for BIF given that it is $1,700 more than the 300, twice the length of the 300, and 3 1/2 times heavier than the 300 (2.6 to 8.5 lbs!)? I simply do not understand the attraction for the 500 f/4; I am open to being educated that 160mm makes a significant difference in BIF photography! Teach me and be convincing and I too will buy the lens and sell the 300!!
Also, as the sensors become more and more sensitive and we can raise the ISOs - it would not surprise me that you might regularly shoot at 1600 or 3200 with the 1D4, at 1/2500 or 1/3200 which would start to fit with both Chris' explanation of his BIF technique, and Tim's humorous explanation of increasing a bit of this and a bit of that to address some of the 50D's shortcomings.
Thanks everyone in this thread for playing the best game in town: the BPN educational two-step!
Cheers, Jay







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