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SonicScot
Joined: 01 Dec 2011
Posts: 2697
Location: Scottish Highlands
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 Posted: Thu Apr 18, 2013 10:30 am Post subject: Sigma's constant f1.8 zoom. |
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SonicScot wrote:
Sigma have just released details of a 18-35 f1.8 zoom lens 
http://www.sigma-global.com/en/lenses/cas/product/art/a_18_35_18/index.html
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Gary
Currently active gear....
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Carl Zeiss.... 180/2.8, 135/3.5, 85/1.4, 35/2.4 Flektagon, 21/2.8 Distagon
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ZoneV
Joined: 09 Nov 2009
Posts: 1632
Location: Germany
Expire: 2011-12-02
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| Posted: Thu Apr 18, 2013 11:38 am Post subject: |
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ZoneV wrote:
Thank you for the information!
I will not buy it, but to know this is good.
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Esox lucius
Joined: 26 Aug 2008
Posts: 2441
Location: Helsinki, Finland
Expire: 2011-11-18
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| Posted: Thu Apr 18, 2013 8:46 pm Post subject: |
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Esox lucius wrote:
A 25 to 52mm FF equivalent f/1.8 lens will undoubtedly come in handy for crop-frame DSLR video, but judging from the MTF charts published on Dpreview I wouldn't use it for stills larger than HD resolution  |
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Yebisu
Joined: 13 Feb 2011
Posts: 1299
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| Posted: Mon Apr 22, 2013 11:50 am Post subject: |
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Yebisu wrote:
| Esox lucius wrote: |
| A 25 to 52mm FF equivalent f/1.8 lens will undoubtedly come in handy for crop-frame DSLR video, but judging from the MTF charts published on Dpreview I wouldn't use it for stills larger than HD resolution |
From what you write it sounds like it's a lens for shooting video on a DSLR. Disappointing if that's the case. 
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Esox lucius
Joined: 26 Aug 2008
Posts: 2441
Location: Helsinki, Finland
Expire: 2011-11-18
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| Posted: Mon Apr 22, 2013 11:54 am Post subject: |
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Esox lucius wrote:
We all have different quality requirements, everyone decides for him/herself what's good for their use.
It is a lens for 1.5x crop DSLR, the lens has a built-in solution the type of metabones speed booster. The MTF charts Sigma published show how detail rapidly drops outside the center circle, which is why I think this lens will not be suitable for still photographers who require even detail throughout the frame. However, I think it will be very much appreciated by DSLR video footage creators - a 25 to 52mm FoV FF equivalent f/1.8 lens is very widely useable for DSLR video in available light. |
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GeorgeSalt
Joined: 09 Feb 2013
Posts: 336
Location: Norfolk, UK
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| Posted: Mon Apr 22, 2013 12:57 pm Post subject: |
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GeorgeSalt wrote:
I see this one doesn't rate the "EX" premium lens designation - or are Sigma moving away from this with their latest lenses? |
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Esox lucius
Joined: 26 Aug 2008
Posts: 2441
Location: Helsinki, Finland
Expire: 2011-11-18
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| Posted: Mon Apr 22, 2013 1:06 pm Post subject: |
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Esox lucius wrote:
Quick glimpse at the MTF I think explains why this lens did not receive the EX designation... |
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tomasg
Joined: 01 Nov 2009
Posts: 1135
Expire: 2014-04-28
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| Posted: Mon Apr 29, 2013 1:21 pm Post subject: |
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tomasg wrote:
Sigma has a new way of branding their lenses, this is an "A" or art series lens, their top of the range, the lens has an equivalent DOF of f2.8 on FF, angle is 27 -52 mm on a Nikon body. Their "A" series 35 mm f1.4 is getting very good reviews.
Tomas |
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GeorgeSalt
Joined: 09 Feb 2013
Posts: 336
Location: Norfolk, UK
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| Posted: Mon Apr 29, 2013 4:44 pm Post subject: |
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GeorgeSalt wrote:
| tomasg wrote: |
| Sigma has a new way of branding their lenses, this is an "A" or art series lens, their top of the range, |
This is what I'm trying to get my head around.. there is no more "EX"? |
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tomasg
Joined: 01 Nov 2009
Posts: 1135
Expire: 2014-04-28
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| Posted: Tue Apr 30, 2013 6:55 am Post subject: |
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tomasg wrote:
No more EX, they now have three "categories" A = Art, fast primes, S = Sport, tele lenses and C that i don t remember what it stands for, but are the cheaper ones.
edit: i found the link...http://sigma-global.com/en/lenses/cas/product/index.html
Tomas |
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