What's my camera doing ?

[Alpha_7]

I noticed a problem with my camera in Boston, but it's not becoming a real problem.

The problem is most apparent in Shutter Priority mode, where if I set the shutter speed to 4 seconds, ever second shot will be taken at 2 seconds.
It previously seemed to only happen when I was using the timer, but no it happens all the time. I was shooting at a party last night some in S mode some in A mode an in either, ever second photo is underexposed compared to the last.

Essentially my photos go, light, dark, light, dark , light dark etc.

My question is, do I have it on some Stupid setting, or does my camera have a real issue ? (maybe a light metering issue?).
It just got really annoying last night as I shot 500 photo's and nearly every second is a waste.

Please help!

If need be I can post examples.

[radar]

Hi Craig,

have you managed to set it bracketing mode? That usually takes either 2 or 3 photos at different exposures. Don't have access to my camera right now, but sounds like it could be your "problem".

HTH,

radar

[Paul]

It's proberly not this but,
You don't have bracketing activated do you?
I can't see it being this as it's shutter speed related.
Looks like it could be a trip to Maxwell's..

EDIT, beaten by Radar!

[radar]

If you have bracketing turned on, you should see BKT in your display panel.

Found the D70s pdf

radar

[gstark]

Metering issues are also a symptom of the BGLOD problem; that's why mine went in this week.

[Alpha_7]

Man, I feel like a dumbarse, but thank you very much... Sure enough I have a look at there is BKT! Hehehe, silly me.. but it explains a lot.

Thanks for the help everyone!