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Plutonium
Joined: 09 Jun 2010
Posts: 8
Location: Gent, Belgium
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 Posted: Sun Oct 10, 2010 3:49 pm Post subject: Sigmatel 135f1.8 vs Vivitar 135f2.3 |
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Plutonium wrote:
This is the first time I make a test, I don't really know how to compare in right way.
Sigmatel f1.8
Crop 100%:
and Sigmatel f2.8
crop 100%
Vivitar f2.3:
Crop 100%
 [/img]
_________________
D40, Nikon 18-55; Series E 50/1.8; Vivitar 135/2.3.
And OMG can not use M42: E Zuiko 135/3.5;Pentacon auto 138/2.8MC; Rexatar 135/2.8; S Tak 55/2; Pentacon auto 29/2.8;Helios-44m 58/2, Pentacon 50/1.8, Soligor 70-160/3.5.
And want to sell K-mount OMG can not use: Autochinon 35/2.8 MC |
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Plutonium
Joined: 09 Jun 2010
Posts: 8
Location: Gent, Belgium
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| Posted: Sun Oct 10, 2010 4:13 pm Post subject: |
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Plutonium wrote:
Compare with f4:
Sigmatel:
crop 100%
Vivitar:
Crop 100%
Compare with f8:
Sigmatel:
Crop 100%
Vivitar:
crop 100%
_________________
D40, Nikon 18-55; Series E 50/1.8; Vivitar 135/2.3.
And OMG can not use M42: E Zuiko 135/3.5;Pentacon auto 138/2.8MC; Rexatar 135/2.8; S Tak 55/2; Pentacon auto 29/2.8;Helios-44m 58/2, Pentacon 50/1.8, Soligor 70-160/3.5.
And want to sell K-mount OMG can not use: Autochinon 35/2.8 MC |
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stingOM
Joined: 27 Sep 2007
Posts: 3168
Location: Ireland
Expire: 2012-12-27
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| Posted: Sun Oct 10, 2010 4:23 pm Post subject: |
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stingOM wrote:
Looks sharper than your Vivitar at f4 or f8, and at f1.8 it does not look bad even with the glow. I am sure it would be a great portrait lens! |
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martinsmith99
Joined: 31 Aug 2008
Posts: 6950
Location: S Glos, UK
Expire: 2013-11-18
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| Posted: Sun Oct 10, 2010 4:46 pm Post subject: |
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martinsmith99 wrote:
Both look ok at F4 on. The WB is colder on the Vivitar.
_________________
Casual attendance these days |
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Screamin Scott
Joined: 13 Oct 2007
Posts: 1014
Location: Dallas, Georgia USA
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| Posted: Sun Oct 10, 2010 5:51 pm Post subject: |
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Screamin Scott wrote:
Looks as though the Sigma is slightly overexposing @ each stop...
_________________
Cameras-Nikon D300, D7100,D610,FE2,FTN ,FT2,N90s, Olympus Pen EP-3 & Olympus OM-D E-M10
Nikkor AF Zooms=28-105/3.5D,28-70/3.5D,35-135/3.5, et al
Nikkor AF //50/1.8,//Nikkor MF//50/2ai,50/1.8ais 50/1.4ai,24/2.8ais,28/2.8ai,28/3.5ai,55microAis/2.8,105/2.5ai,200/4ai,300/4.5ai35-135/3.5Ais,et al
Kiron /Kino made lenses//70-210/4ai,28-105/3.2ai,30-80/3.5ai,Viv 28/2ai,35-85/2.8aiVivS1,105/2.8Ais Dine,24-48/3.8ai VivS1,50-150/3.8aiViv,28-85/2.8aiViv,100/2.8Nai Viv,70-210/3.5Nai Viv,28/2.5ai Viv Komine made Viv//24/2Ais,135/2.8aiCF,28-50/3.5ai,28-90/2.8ai Viv S1,80-200/4.5aiCosina made Viv 19/3.8 Ais...Also Sigma 24/2.8 Ais Tokina made24/2.8ai VivAF Sigma 21-35/3.5,& other lenses... A link to some of my Flickr albums...
https://www.flickr.com/photos/screaminscott/albums |
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8310
Joined: 05 Jun 2010
Posts: 123
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| Posted: Mon Oct 11, 2010 10:38 am Post subject: |
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8310 wrote:
The bushes in the background on the 100% crop of the Vivitar @2.3 look sharper to me than the stone pillar. Slightly misfocused? |
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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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| Posted: Sun Feb 26, 2012 2:57 pm Post subject: |
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DSG wrote:
| Screamin Scott wrote: |
| Looks as though the Sigma is slightly overexposing @ each stop... |
Probably because its actually passing more light through than the Vivitar at each f-stop  |
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DSG
Joined: 04 Mar 2007
Posts: 544
Location: London, UK.
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| Posted: Sun Feb 26, 2012 2:59 pm Post subject: |
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DSG wrote:
| 8310 wrote: |
| The bushes in the background on the 100% crop of the Vivitar @2.3 look sharper to me than the stone pillar. Slightly misfocused? |
I would say so too...The Sigmatel needs very critical focussing for best results. I also noticed that the Vivitar has more CA at f2.3 than the Sigmatel has wide open. |
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