Sigma 10-20 arrived but.....

D

devitt

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Karl
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For some reason when adjusting the aperture and shutter speed for the correct exposure that the display says through the eyepiece, the photos come out very under exposed. Any reason for this or just normal with this lens. Overall i am very happy with the lens and no problems with quality here.:)

Any help apreciated :thumbs:
 
Not got that lens (yet) where did you get it from, and how much did you pay if you don't mind me asking?

JB
 
Which camera
 
Try taking a few shots full auto. Should give you an idea of whether the cam is controlling the aperture correctly (confirm it with .exif info). Oh and of course make sure the cam isn't set to under expose (compensate).
 
In fact, to add what our scouse friend above said, do a full reset on the camera just to be safe.

Cheers,
James
 
Its on a Nikon D80

Krazy Horse- I got it from Devon Camera as its only an hour away from me so any problems with it could got down there myself. Paid £300 for it.

Will try the ideas said so far, thanks people;)
 
Right i just did another test shot in my bedroom with the lights on- On full auto its setting it to f4 with a 4 second exposure. Seems alot or is it me?
 
That does sound a bit strange....try a shot pointed almost right at the lamp?

Cheers,
James
 
Thanks james, just did that on auto again and set itself to f4 again but at shutter of 1/60?? Still seems odd to me
 
1/60 is sounding more like it, depending on the metering mode and ISO...

Hmmm, this isn't an easy one.
 
I use mine on a Nikon D80 and i can honestly say i have never encountered that issue on any modes with my copy m8.
Might be something to do with the camera's settings as it doesnt really sound like a lens problem.
 
Hmmmm tricky. The D80 has no problems with my 18-70. Maybe if i upload an imgae from earlier today with the settings, you guys would know if it sounded/looked right?
 
This is at f11 1/100 it was very bright sunlight just left to the shot but these figures seem ok compared to the indoor shot I took a while ago?? Maybe just me being dumb as havnt been doing it all that long.:shrug:

DSC_01370647.jpg
 
Forgot to add. When i took this shot the camera was telling me i was over exposing but was comming out just right?? Sorry guys lol, thought id better ask else would bug me
 
hmm. Firstly, set the camera to factory settings (if you can't find this in the menus, remove the battery and the small battery for a few mins). Then take the same shot with the 10-20 and the kit lens (in manual mode, so that the camera uses the same iso/f. and shutter speed. Making sure that metering is for the scene, not spot metering, as it should be as standard afaik). They should be very similar in terms of light in the scene.

Obviously too don't try it in a room that's very dimly lit.
 
That shot looks right to me, a little over but f11 at iso 100, shutter 1/100 looks good and as it should be. I would have thought f16 for a full sunny day.
 
I've found with my D80 that some lenses expose better than others... not sure why, but now I've found that when I change lenses I set exposure compensation values too. Not a big deal for me though as usually I change my mind about exposure depending on what I'm shooting anyway.

FWIW I think the above shot is pretty well exposed too.
 
Thanks for that theory. I did a google search on the lens after i created this post and it did come up with a couple of reviews saying it could underexpose. And they suggested adjusting the exposure compensation like you said.

I went out with it they day i got it and alot of my shots were exposed well, but mainly at guess work rather than working with the cameras exposure metering. But least my minds at rest, so thanks guys and girls. Realy happy with the results it gives.
 
theory said:
I've found with my D80 that some lenses expose better than others... not sure why, but now I've found that when I change lenses I set exposure compensation values too. Not a big deal for me though as usually I change my mind about exposure depending on what I'm shooting anyway.

FWIW I think the above shot is pretty well exposed too.
Click to expand...

So its not just me then.
When i have the Sigma 30mm f/1.4 on the D80, need to dial in -0.7EV. Yet with the 70-200 f/2.8 that same value makes pictures too dark.
 
Yep someone else said to adjust it to -0.7EV on the 10-20. Seems strange that not all have this, or do they?
 
Devitt, if you're unsure, send it back. A guy at work bought a 10-20mm and immediately noticed it wasn't working (focussing). Sent it to Sigma and had a replacement through a few days later. have heard there are hit 'n' miss probs wth thsi lens.

Sigma are sound though. Had a yonks old 75-300 APO that had been knocking around in my bag for a few years - started focussing badly so sent it for assessment/servicing and received a brand new one in return. Can't fault that!!
 
Hang on folks, I think we're missing the point here. Lenses don't under-expose or over-expose. It's the cameras that do that. Or the people behind the cameras...

I bet what's happening here is that devitt is using some sort of evaluative metering on his D80, and the camera is struggling to work out which bits of the picture are supposed to be exposed properly. An ultra-wide lens typically puts a lot of sky into the frame, and the sky is typically brighter than the subject, so it's easy to see how the camera might under-expose in order to try to expose "correctly" (as it sees it) for the sky.

devitt, did you try what benneh suggested back in post #16? That would be a good test. Try it out, then come back here and post the pictures and tell us how it went. You'd be just wasting your time and the shop's time and money if you took the lens back before we've ruled out "user error".
 
Yeah, its blatantly not the lens at fault for the EV adjustments required. Just a niggle you have to work around when using a D80... I'd imagine many cameras expose differently with different lenses - you just get to know them and get on with it. All part of the fun. :)
 
Cheers for all the info. Did like said and reset the camera and all seems good with it. Just wish we had the weather today to use it in my free time lol. Thanks again
 
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