I was shooting a ferris wheel in Bristol’s Castle park using my Pentax MX 35mm SLR and a Weston Master V handheld meter (The light meter in my Pentax in broken).
I metered the scene, dialled the exposure values to the camera and starting shooting, but I’d forgotten to take into account that I was using a polarizing filter which reduces the amount of light entering the lens often by 2-3 f-stops (1/4 to 1/8 the amount of light).
The underexposure with a combination of the polarizing filter with the slide film (In this case Fuji Velvia 50) has created a dramatic black sky which I really like.

Castle Park Ferris Wheel. Pentax MX, 28mm f2.8, Fuji Velvia 50 Slide Film

Castle Park Ferris Wheel. Pentax MX, 28mm f2.8, Fuji Velvia 50 Slide Film
After a few shots I realised what I’d done and adjusted the shutter speed. Not a great exposure, but you can see the comparison.

Castle Park Ferris Wheel. Pentax MX, 28mm f2.8, Fuji Velvia 50 Slide Film
Awesome on the black background, like it’s in space. Reminds me of 2001: http://carriedaway.blogs.com/photos/uncategorized/2001_space_station.jpg