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I assume it is the 400mm F5.6 L lens? I purchased one mainly for bird in flight photography and it has performed exceptionally well. I can shoot wide open at F5.6 and the lens delivers very sharp results with no evidence of CA.
This is a specialist lens for wildlife and sports photography although the relatively slow aperture of F5.6 does require reasonable light to keep the shutter speed up to avoid camera shake due to the extreme magnification of the lens.
This is a definite keeper and remarkably light weight and easy to handle although I mostly use a tripod and a gimbal mount just to minimise the potential for blurry shots. It’s not really a walk about lens for general use, although you can walk about with it as it is so lightweight for a 400mm.
I took some 30 second and 3 minute shots of the HST passing close to Jupiter and did notice some lens flare probably caused by the bright Jupiter in the frame. Using the Canon 40D with Remote Live View makes this lens easy to focus. A Bahtinov Mask would make it even easier.
If you do a search in the Forum on Canon 400mm you should find some of my bird in flight shots and a few sample astro shots.
Cheers
Dennis
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