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Nx 50-150 is it really F4.2

Started Apr 12, 2016 | Discussions thread
viking79
viking79 Forum Pro • Posts: 14,157
Yes and No
4

Its full frame equivalent lens would be 75-225 f/4.2, yes, but it is still a 50-150mm f/2.8 lens, those physical properties never change.

The equivalent part comes into play if you were to use a 70-200mm f/4 lens on your 6D, shooting at 200mm f/4 ISO250 1/100 sec you would select 135mm f/2.8 and ISO100 1/100 sec to get exactly the same shot: framing, depth of field, image noise, and shutter speed (assuming similar sensor tech).

You will find that full frame offers more flexibility, but is not unilaterally better. There is always a trade off. For full frame you can trade depth of field for faster shutter speed, longer shutter speed for lower image noise, etc.

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