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Prime v Zoom exposures

Buzz Fisher

London, UK
12 posts

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Buzz Fisher Registered since 02nd Mar 2013
Sat 15-Jun-13 08:44 AM | edited Sat 15-Jun-13 08:45 AM by Buzz Fisher

Hi all
Why does my new 24-120mm F4 zoom underexpose by 0.95 of a stop compared with my 50mm F1.8 prime which exposes correctly.

Assume all other things equal, image subject, light level, 50mm focal length, both ISO 100, aperture priority, metering mode and both using the same D800.

The only variation is the shutter speed. The zoom selects 1/60 second and the prime gives 1/30.

No great issue correcting this in camera and using lightroom, and the variation obviously because of the shutter speed, but curious why this is happening.

Was thinking it might be to do with the number of elements in the lens etc. Am I right thinking this or am I missing something more obvious?

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