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05-19-2009, 12:21 AM   #1
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Issues regarding Sigma 18-50mm f/2.8 lense.

Hello Buddies!

I have recently bought a new 'Sigma 18-50mm f/2.8' lense for my Penatk K10D. I have obesrved that the pics taken using this lense are slightly under exposed when compared with other Pentax lenses that i own. I have tried changing the exposure metering patterns between Matrix, center weighted and spot. But still the pictures we litter under exposed. I have read many good reviews about this lense. I was very much excited when i got this lense but now seeing the results i am some what dejected. What could be the reason for this? Can any one please help?

Thanking you,
VICKY.

05-19-2009, 12:33 AM   #2
Damn Brit
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Try using positive EV compensation. If the lens is under exposing, changing the metering probably won't make any difference.
05-19-2009, 12:39 AM   #3
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Hi,

Would you kindly post some pics that is under exposed. I've been using this lens for a year on K10D and it does underexposed some time but I like it that way, rather then overexposed and blown the highlight. See my review on this lens here.

My thought on the Sigma 18-50mm F2.8 EX DC MACRO - ClubSNAP Photography Forums
05-19-2009, 12:42 AM   #4
Damn Brit
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QuoteOriginally posted by simdavid Quote
Hi,

Would you kindly post some pics that is under exposed. I've been using this lens for a year on K10D and it does underexposed some time but I like it that way, rather then overexposed and blown the highlight. See my review on this lens here.

My thought on the Sigma 18-50mm F2.8 EX DC MACRO - ClubSNAP Photography Forums
The problem with underexposing is that, in post processing, you will find that there can be excessive noise in the darker areas and possible loss of detail. If you shoot in raw and expose to the right, blown highlights should be less of a problem and there should be less chance of loss of detail.

05-19-2009, 02:00 AM   #5
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QuoteOriginally posted by i am pentaxian Quote
The problem with underexposing is that, in post processing, you will find that there can be excessive noise in the darker areas and possible loss of detail. If you shoot in raw and expose to the right, blown highlights should be less of a problem and there should be less chance of loss of detail.
__________________
The amount of under exposure is only by two stops. And i dont thing that its to such an extent taht will result in excessive noise in darker areas. I always shoot in raw and expose for the highlighted area in a contrast lighting situation. Now i have been dialing in over exposure compensation to counter this problem. But my question is that why does this occur with this lense and not with my all other Pentax lenses? What the logic behind this lense giving slightly under exposed results?
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