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Photozack81 wrote:
It probably won't be super heavy if it's 4.5 to 6.3. I get why the industry's moving towards 6.3 lenses, they're smaller and lighter and modern cameras don't really care about the ISO bump to keep shutter speed up. I still find it annoying.
We already know the weight, it is a little bit lighter than the similar Sigma zoom so apparently this is about as good as it gets at this spec and price level. Although not for everyone, light and compact lenses have their advantages and in this case the main penalty is just 1/3 stop light loss compared to the much heavier Canon (and possibly more AF limitations, depending on body / TC use etc.).
Personally I'm mostly interested in image quality closeup and at wider apertures, I'm very unhappy with the Canon 100-400II for this. Looking through Sigma 100-400 closeup images my impression is that it doesn't have the 'glow' problem of the Canon lens, most images look acceptable but not really good either (significantly worse than the old 4/300IS). I hope the Tamron is better but probably closeup IQ is an afterthought in these lenses as they are optimized for long distance shooting. At least the Tamron has a tripod clamp option (never use it, but you never know) and might have a bit better IS as well.
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