August 20, 2014, 01:13:54 PM

Author Topic: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp  (Read 9497 times)

insanitybeard

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #30 on: July 24, 2013, 11:24:52 AM »
It is likely to be too sharp for the D7100 (no AA filter).

Yes yes, but forget sharpness for a minute, just think about all that lovely DR......  :P  ;)
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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #30 on: July 24, 2013, 11:24:52 AM »

fvaron

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #31 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?

Radiating

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Re: The Sigma 18-35mm f/1.8 DC HSM Lens is Very Sharp
« Reply #32 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 #32 on: July 25, 2013, 11:55:19 PM »