The Sigma 80-400 OS


First impressions

First of all, the reason why I bought that lens is a small mistake. The first "serious" telezoom I bought for my new D70 camera has been the Sigma 70-200 EX 2.8 with a Sigma 2x teleconverter.
I bought those because I wanted quality glass and fast glass at a reasonable price and the possibility to have a 600mm equivalent for nature photography. In fact, the combo 70-200+TC was working pretty well, with excellent sharp pictures BUT in practice I was switching all the time (with or without TC), because sometimes I needed the speed (2.8) because of the poor light, sometimes I needed the reach (shorter than the 140mm you get as a minimum with the TC installed), sometimes I wanted the 400mm etc...
So I looked for a better solution.
The Sigma 80-400 OS gave me the range I was looking for, with a smaller aperture on the short end but with the optical stabilization, a major advantage for relatively static subjects. In the meantime, this lens became my favorite nature lens.

For the pros and cons, also have a look here (comparison between the Nikkor and the Sigma)

Pros

- incredibly versatile zoom - fantastic range
- OS is working and can save quite a lot of pictures (400mm 1/60 is possible hand held)
- very good build quality
- reasonably fast AF (built-in motor) body independent

Cons

- weight and size
- softness if not closed down @400mm
- AF and OS are a bit noisy
- I don't like the grey finishing of the Sigma lenses
- lens with a learning phase

The technique - tips

It is important that you pre-activate the OS before shooting by pressing the shutter button. It takes approximately half a second to stabilize. You see a kind of slow motion effect in the viewfinder, confirming that OS is active. Use mode 1 for normal shooting, mode 2 for panning (typically shooting cars or planes during an airshow).
To get the best picture quality @400mm, you will have to close down to f11 (peak performance). This is easily usable even for action shots on a sunny day but you might have to select a high ISO value (ISO800 gives perfect results on a D200). See examples below.

Pictures - a few among my favorite shots (I have tons of them)

Sharp eyes

  Sharp eyes

Whale watching @400mm Tadoussac, Quebec province, Canada

  Whale Tadoussac

Another one (whale watching in the mist...)

  Mist while waiting for whales

Action shot (bikers in BC, Canada)

  bc4 33

A last one, the lens is huge when extended (here mounted on a D200)

  BC8  86