Jeff Donald Offline Upload & Sell: Off
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I've had the 150~600mm since the end of January, selling my 100~400mm Canon a few weeks later. I use it on 2 bodies, the 7D and 1DsMkII. The MkII is the same vintage as the 1DMKII. I have no issues with the focus with the older 1DsMkII. The lens does not need MFA and is very sharp. It does Ai Servo, but a 4FPS is limiting. I believe it will work fine on the older 1D as well.
The 7D required a MFA of +12. The Ai Servo is not as good as using the 300mm f/2.8 (with or without TC, and is only slightly worse than the 100~400mm. I've not sent my 150~600mm in for the firmware upgrade yet. There has been too much action here still with nesting birds etc. I do a lot of BIF and it is a frustrating experience with some shots. But I do more BIF in the cooler weather, preferring the woods and beaches to shot nesting birds.
I find the Tamron as sharp or sharper at all focal lengths, including 400mm. The ⅓ stop (f/5.6 to f/6.3) light loss is not a critical issue in sunny Florida. It is definitely sharper than the 100~400mm with a TC and I've used the series II and III TC's.
Here are a couple of recent shots with the Tamron
Both images 1Ds MkII 150~600mm, f/10, ISO 200, 1/100 sec. shutter speed, on tripod with 430 EX and Better Beamer EC -1⅔.
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