Quote:
Originally Posted by Wavytone
Focal ratio is F/D... f/4 is f/4 and always will be.
“crop factor” is an ugly fiction that should be ignored - stick to the actual measurements in mm, always.
The sensor dimensions and focal length of the lens determine the field of view. Simple geometry.
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Thanks, but I have to disagree.
Most people don't know the size of their sensors, and are unlikely to be able to do the simple geometry you suggest. They may, however, be able to do the simple arithmetic to work out equivalancies using effective focal length and effective f number to match the actula results they see in their camera.
Regards,
Renato