m43 instead of FF

Started 5 months ago | Discussions thread
inasir1971
Senior MemberPosts: 3,015Gear list
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Re: m43 instead of FF - nuts!
In reply to Ontario Gone, 5 months ago

Ontario Gone wrote:

Christof21 wrote:

57LowRider wrote:

I read that the Sony A7 / A7r beats the Fujis in low light

This is exactly the reason why I say that larger sensors are overrated . Do you mean that you compare images at similar ISO ? This comparison is not fair !! Hopefully, the bigger sensor will perform better, if it was not the case (or if it was only 10% better), I would choose the smaller sensor for low light conditions because it would mean the sensor is more efficient.

Yea, the idea of a larger sensor is a tricky thing. This is bc sensor size is not the only factor in light gathering, lenses are the other half of the equation. This is where it gets hairy. The problem is, some people want to claim bigger sensors are always going to be better (in regards to noise, in this conversation). On a static scale, this is true, but price is ALWAYS a factor for 99% of us. Since larger apertures cost more, and since larger sensors require larger apertures to get that extra light, cost will always be tied in.

????? This is just completely wrong. The physical aperture size is given by focal length / f-number! For a given focal length and max aperture given by f-number the aperture size is identical irrespective of sensor size.

Yes, it is more expensive to produce an f/1.4 lens than an f/2 lens and it is much more expensive to produce an f/1 lens than an f/1.4 lens but this works against M43. Faster lenses require more complex designs with a greater number of elements.

To get the equivalent, in terms of depth of field, for a 50mm f/2 on full frame, APS-C requires a 35mm f/1.4 lens, and M43 needs a 25mm f/1 lens. For example,

* FF Nikon 50 1.8G - $217, 7 elements

* APS-C Fuji XF 35mm f/1.4 - $599, 8 elements

* M43 Voigtlander 25mm f/0.95 - $999, 11 elements

All of these give a 50mm angle of view with roughly an f/2 on full frame depth of field. Or this example for 35mm f/2:

* FF Canon EF 35mm f/2 IS - $549, 7 elements

* APS-C Fuji XF 23mm f/1.4 - $899, 11 elements

* M43 Voigtlander 17.5mm f/0.95 - $1149, 13 elements

In both of these cases, at maximum aperture, the Fuji lens does better than the M43 alternative.

In addition, using a smaller sensor magnifies the final image more than a larger sensor. This means that the smaller sensor has to use a better corrected and higher resolution lens just to achieve the same image quality as that from a larger sensor as the image (and any issues like CA) will be magnified more by the smaller sensor. Faster, better corrected lenses => more expensive (and larger)

Given that APS-C and M43 sensors are both very low cost now (not enough to be a factor in choosing which to use anyway) it is just plain nuts to use the smaller sensor - the lenses will end up costing more. Heck, APS-C is probably cheaper (and technically more advanced) due to competition by manufacturers of APS-C sensors.

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