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Canon EF 400mm f/4 DO IS USM

ef400_4dois_1_
Review Date: Sep 24, 2012 Recommend? | Price paid: Not Indicated

 
Pros: Updated review - wow on micro adjusted 5DII
Cons:
too busy enjoying my images to notice

I recently upgraded to a 5DII. With improved iso performance, this lens is phenomenal for wildlife photos hand held. Super crisp photos! For small birds, focal length is way too short.

 
Canon EF 400mm f/4 DO IS USM

ef400_4dois_1_
Review Date: Sep 17, 2011 Recommend? yes | Price paid: Not Indicated | Rating: 9 

 
Pros: Luggable supertelephoto (day hikes possible!) IS F/4
Cons:
Minor - needs some extra pp with contrast

I bought mine on eBay for a fairly reasonable price in great condition.
I can lug this lens around with my toddler on my back in a kelty backpack on day hikes. And I can shoot handheld!
400 mm is a tough focal length to break into. There is a real line in the sand here where money and weight play a role.
I rented the 100-400 but the 5.6 aperture was too limiting in woodsy areas (ok in better light).
I rented the 500 f4 and it was just too big to take on day hikes with my family. If I were single, this would be my lens.
The 400 f5.6 does not have IS. Since light is not always great and I need to shoot hand held, I did not consider it much.
It certainly is a niche lens, overpriced brand new.
Takes a 1.4x converter very well. I have read and am beginning to agree it will take a 2x converter well if you stop it down one stop and use a tripod. I used it hand held at 800mm and was shocked by the quality of the image. I only wish I had the time to whip out my tripod.
I do need to process raw images with some extra contrast - seems like an overrated complaint. With a long lens I have noticed a bit of back focus so sent the lens and 5Dc in for calibration.
If the used price is fair - get one!