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I took the 200-400 on a bird watching (spring warbler) trip. Thoughts, and 400 5.6 comparison too.

Started May 30, 2017 | User reviews thread
John Sheehy Forum Pro • Posts: 26,698
Re: do not see this as a birding lens

ed rader wrote:

500-600 native length for birds

Why native length? What's wrong with a very sharp 300 or 400mm with a quality TC? Or do you really mean with the lower f-numbers or large apertures of 500mm/4 (125mm) and 600mm/4 (150mm)?

Otherwise, a 500mm/6.3 is inferior to a 400mm/4 with a 1.4x.

I use my 400 DO II IS as a 560 DO II IS, and it performs well on my 7D2, and whatever replaces my 7D2 eventually (hopefully a 7D3 with D500-like high ISO noise), will hopefully give me a better 800 DO II IS where the AF doesn't get blind in low light combined with complex scene depths.

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