World Photography Forum - 500mm Where to buy/view

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Quote:

Originally Posted by Joe (Post 21479)

I don't know how important it is to you, but the Tamron has a constant f/5.6 aperture through the whole zoom range, where-as both Sigma's listed vary through the zoom range (darken down at the tele ends)
Mostly not a problem with modern auto systems...but if you plan shooting in manual mode, it's something perhaps to keep in mind?

The Tamron is a f5-6.3, the Sigma 50-500 is f4-6.3. I used to have the Tamron & apart from the noisy zoom, loved it.
Regards Rob.

Thanks for your help everyone, you've given me a lot to think about.
Rach

sorry, was a different Tamron lens (older version) I was thinking of with the constant 5.6! :o