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Author Topic: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp  (Read 18578 times)

fvaron

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #30 on: July 24, 2013, 10:29:11 PM »
I am very excited for this lens unfortunately it was announced some time ago and still no inventory to sell. As for the full frame folks...how's your back lugging that heavy gear around?

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #30 on: July 24, 2013, 10:29:11 PM »

Radiating

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #31 on: July 25, 2013, 11:55:19 PM »
The F-stop is 1.8, the T-stop will probably be in the 2-2.1 neighborhood, possibly 2.2 with that many elements.

DXOMark said it's 1.8, although that is pretty unusual

Yep, this means that likely the lens's true f-stop is HIGHER than f/1.8 ( say f/1.7)and they rounded down. Most manufacturers overstate a lens's performance, Sigma is clearly not doing that.

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #31 on: July 25, 2013, 11:55:19 PM »