In practice: the speed loss I remember nothing at all, even a zufahrendes me car in the city area, full-frame, good 50km / h, the 1D Mk4 with AI Servo creates effortless.
Picture quality: I find it difficult to perceive a reduction, although these in several reviews (the digital picture, Traumflieger) describes and I am indeed tricky, but not bean counters (ie also neudeutsch pixelpeeper :)) P)
Nett: in the ExIFS find correct data concerning also focal length and aperture.
New problems: Of course I want the new focal length a little play, so visit my proven elevated points to photograph from there, for example, my hometown. Has always been at distances of 8 to 15km difficult because there is a lot of air in between, which is not always so transparent, as it should be.
A few nearer motifs ranging from a few hundred meters then have calmed down.
Accommodation in the camera bag: this converter is about 3cm long, that is for me, that it no longer fits in the Lowepro Classified 200AW at 5 or 1er Body. At this point, the Digital Holster 50 was recommended by Think Tank:
1er or 5 with 70-200 / 2.8 IS II with Converter 1.4 III and properly being set sun visor: watch out!
Before buying please contact Canon inform (Website) whether the converter with the desired lens also plays together.
He has the unpleasant property that the part which projects into the lens, is a bit long, and because not all play lenses. Competing products by alternative manufacturers offer as more flexibility.
In summary: a moderate, significant focal length multiplier and related new, delightful perspective.
Recommendation.
PS: I am convinced that a Fixbrennweite would bring better results from 300/4; Nevertheless, I am surprised by the quality of my combination and enjoy their greater flexibility.
