Medium Format.

Started Jun 3, 2014 | Discussions thread
JNR Veteran Member • Posts: 3,035
Re: Medium Format.

viking79 wrote:

The difference between APS-C and 24x36 mm "full frame" is much greater than the difference between 24x36 and 33x44 mm medium format.

So 24x36 is about 1.25 stops more flexible than APS-C, and the 33x44 sensor is about 0.75 stops more flexible than 24x36, or 2 stops more flexible than APS-C.

It is better, but the cost benefit trade off decreases rapidly. In fact the 24x36 has more flexibility due to larger aperture lenses.

So if money is a driving factor I would go affordable high end like D800 (A7/R doesn't really have enough lenses yet, look at what they have and see if it would work for you, and the 24-70mm f/4 is not very good). If money is not a driving factor then the 645z would be a really nice camera I imagine.

Also, the larger the sensor is, the less enlargement to get to your output sized image (web or print). This usually means sharper and more detailed images with the larger sensor. This is probably only noticeable at larger output sizes.


Logically, what Eric says is 100% correct. Having seen a lot of prints and web photos from 33x44, my eyes tell me something entirely different. DxOmark tells us - statistically - that the D800 is slightly superior to the 645d in all respects. But every controlled comparative tells our eyes that the larger sensor is considerably superior in detail and color depth - especially at low ISOs it isn't remotely close, either.

I have to wonder if raw real estate counts most. In that regard, the gap between FF and the 645 sensor is LARGER than the gap between APS-c - 588 to 471 (typically) in mm2. It appears to me that the story is more complex than calculations are indicating. (And I'm someone who left full frame to return to APSc, and have found the latter more than adequate.)

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