1
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Re: How can we find out?
In reply to smatty,
4 months ago
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smatty wrote:
AlbertInFrance wrote:
Maybe it's got something to dom with the generally recognised fact that the X-E1 is a bit 'optimistic' about ISO ratings?
The varialbles ISO, shutter speed, f-stop and even white balance temperature were stayed fixed in the camera for both lenses. So the result must have something to do with the lens rather than any camera settings.
Cheers,
Smatty
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The aperture value would only tell you how much light was hitting the if glass had 100% transmission. It doesn't. The more elements, the less transmission. That's why other industries (like cinema) use T-stops instead of F-stops. F-stops are geometrical relationships between focal length and aperture size, while T-stops tell you how much light actually passes through the lens.
It's not crazy that two f/1.4 lenses will have different transmission.
Owen
--
www.flickr.com/photos/owencherry
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