Crop Factor, Low Light and Aperture with m4/3 lenses?

Started Jun 15, 2014 | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 62,183
Re: Very simple:
2

Anders W wrote:

Just another Canon shooter wrote:

Anders W wrote:

Just another Canon shooter wrote:

Anders W wrote:

FF has the same noise for equivalent images only if the sensors are equally efficient. But as a rule they are not. Smaller sensors tend to be more efficient than larger. See here:

http://www.dpreview.com/forums/post/53189207

Not true. QE of newer sensors is about 53%, see sensorgen, from m43 to APS-C to FF.

Sensorgen doesn't have data for many of the sensors in my sample and are based on fitting curves to numbers that results from previous curve fitting.

It does, for the most relevant bodies.

Why should we use partial data if we can use more complete data? And why should we use fitted data points if we can use real data points?

Anders, if you have good data for a full range of cameras, why not publish it so we can all use it? Then the sensorgen data with its acknowledged faults would be redundant. As it is, your 'real data points' seem to be derived from exactly the same data and your method involves 'interpolation' - so the meaning or the word 'real' here is not maybe what most of us would think of as 'real'.

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Bob

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