Are you tempted to switch to Sony A7 or get one as well as your Fuji?

Started Oct 17, 2013 | Discussions thread
hexxthalion
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Re: Are you tempted to switch to Sony A7 or get one as well as your Fuji?
In reply to Krich13, Oct 21, 2013

Krich13 wrote:

hexxthalion wrote:

Krich13 wrote:

F/2.8-4 lens is f/2.8-4 regardless of film/sensor size

... and 18-55 mm lens is 18-55 regardless of film/sensor size.

However, if you convert the focal length for equivalent angle of view, you must also convert the aperture for the same depth of field and light gathering ability (e.g. to evaluate noise or signal-to noise performance (and convert ISO for equal shutter speed).

For instance:

18 mm f/2.8 lens on a crop x1.5 camera at ISO 200 would produce a shot virtually indistinguishable from (same angle of view, same DOF, same signal-to-noise -- if the sensors use similar technology, same shutter speed/motion blur and even the same diffraction limited resolution) as 27 mm f/4.2 lens on full frame camera at ISO 450 AFTER both shots are scaled (up/or downsized) to the same pixel dimensions.

That's all fine, but comparing Fuji's fast zoom to Sony's slow zoom is pointless - we're talking about the 'speed' of lens, or light gathering ability. So in real world where you'd use large aperture on the wide end would be probably under worse light - you wouldn't do it for shallow DoF.

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