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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 24 Jan 2011 (Monday) 03:48
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OverExposure issue in Sigma 30 f1.4

 
commonjunks
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Jan 24, 2011 03:48 |  #1

So i bought this lens last week and start testing.
A bit disappointed with Exposure on Aperture mode.
At times when i am in darker room, camera automatically push shutter speed to 1/800++ and picture is all black. And some time when i am taking picture in bright day light the shutter speed go down all they way to 1/15 and result in white picture.

i took few pictures this morning
Camera in Aperture mode, f1.4 and ISO 100, focus is on left eye of joker.

Test #1 (Exposure time: 1/15, picture all turn white).

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'

Filename: img7922m.jpg
Size: 235Kb
Resolution: 1024 x 683
Camera used: Canon Canon EOS 7D
Focal length: 30.0 mm (35 mm equivalent: 238.5 mm)
Aperture: f/1.4
Date/Time: 2011-01-24 14:11:34.00
Exposure time: 1/15
Lens F-Number: f/1.4
ISO: 100
Whitebalance: Auto
Metering mode: Spot
Exposure: Aperture-priority AE


Test #2 (Very sharp)
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'

Filename: img7924u.jpg
Size: 356Kb
Resolution: 1024 x 683
Camera used: Canon Canon EOS 7D
Focal length: 30.0 mm (35 mm equivalent: 238.5 mm)
Aperture: f/1.4
Date/Time: 2011-01-24 14:12:22.00
Exposure time: 1/125
Lens F-Number: f/1.4
ISO: 100
Whitebalance: Auto
Metering mode: Spot
Exposure: Aperture-priority AE


Test #3 (focus on right eye, everything gone blur. It is very drastic)
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'

Filename: img7928a.jpg
Size: 331Kb
Resolution: 1024 x 683
Camera used: Canon Canon EOS 7D
Focal length: 30.0 mm (35 mm equivalent: 238.5 mm)
Aperture: f/1.4
Date/Time: 2011-01-24 14:13:50.00
Exposure time: 1/125
Lens F-Number: f/1.4
ISO: 100
Whitebalance: Auto
Metering mode: Spot
Exposure: Aperture-priority AE


Test #4 (again exposure went to low)
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/png'

Filename: img7931f.jpg
Size: 296Kb
Resolution: 1024 x 683
Camera used: Canon Canon EOS 7D
Focal length: 30.0 mm (35 mm equivalent: 238.5 mm)
Aperture: f/1.4
Date/Time: 2011-01-24 14:14:59.84
Exposure time: 1/25
Lens F-Number: f/1.4
ISO: 100
Whitebalance: Auto
Metering mode: Spot
Exposure: Aperture-priority AE


Did anyone face same issue (if yes any advice)?
I love this lens for its cost and f1.4 but i don't think i can live with 3 out of 10 bad exposure pictures. This never happen in any of my previous lens (all of them were canon).

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Omaru
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Jan 24, 2011 03:53 |  #2

https://photography-on-the.net/forum/showthre​ad.php?t=990293

Check my reply.

SPOT metering is sometimes the problem for jumpy / inconsistent exposures add to that you were also shooting on Av ( aperture priority mode ).


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commonjunks
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Jan 24, 2011 04:02 |  #3

Omaru wrote in post #11702939 (external link)
https://photography-on-the.net/forum/showthre​ad.php?t=990293

Check my reply.

SPOT metering is sometimes the problem for jumpy / inconsistent exposures add to that you were also shooting on Av ( aperture priority mode ).

Omaru, thank you very much. Is it a bug in Sigma 1.4 lens?
I did a few test now and it is working perfect, very appreciated your reply in my question.


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Omaru
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Jan 24, 2011 04:14 |  #4

No I don't think there's a problem with your lens.


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kingbob734
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Jan 24, 2011 05:29 |  #5

Yea i do not have this problem, as people have said, spot metering can be the problem, not metering on the right level to get a good reading of natural light and so on coming from the left in that shot, especially as your shooting wide open, its more of a user error than the lens. Keep playing :D


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commonjunks
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Jan 24, 2011 06:09 |  #6

kingbob734 wrote in post #11703132 (external link)
Yea i do not have this problem, as people have said, spot metering can be the problem, not metering on the right level to get a good reading of natural light and so on coming from the left in that shot, especially as your shooting wide open, its more of a user error than the lens. Keep playing :D

Yes i think this time it is user error :oops:, but now i am loving the result.


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C.Michael
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Jan 24, 2011 06:32 |  #7

Focal length: 30.0 mm (35 mm equivalent: 238.5 mm)


HUHHHH??


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kingbob734
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Jan 24, 2011 07:16 |  #8

Its an awesome lens, it really does do the job well :)


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hieu1004
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Jan 24, 2011 07:39 |  #9

It's not the lens.....

Congrats on the Siggy 30, it's an excellent piece of glass.


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kendon
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Jan 24, 2011 08:17 |  #10

you may want to use a tripod when conducting such tests.


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commonjunks
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Jan 24, 2011 09:05 |  #11

kendon wrote in post #11703585 (external link)
you may want to use a tripod when conducting such tests.

Kendon, i did use tripod but i found hand held was more sharper than tripod mount (it is weird but believe me). But since i change my spot metering to Evaluative everything is back to normal.


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yogestee
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Jan 24, 2011 09:57 |  #12

commonjunks wrote in post #11703787 (external link)
Kendon, i did use tripod but i found hand held was more sharper than tripod mount (it is weird but believe me). But since i change my spot metering to Evaluative everything is back to normal.

A wobbly tripod is usually worse than hand holding..


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muskyhunter
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Jan 24, 2011 10:35 |  #13

curious to know what was your distance from the object?



  
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kendon
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Jan 24, 2011 11:32 |  #14

muskyhunter wrote in post #11704335 (external link)
curious to know what was your distance from the object?

according to exif it was 0.41m, or about 1.3 feet.


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Jan 24, 2011 13:55 |  #15

your doing spot metering...and behind the object you want is nothing but jet black...i think the camera obviously metered off of the black on a couple of those..as to why it's out of focus in the others...i don't know...but what AF mode were you in?


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OverExposure issue in Sigma 30 f1.4
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