Long Lens for the M6 ii

Started 3 months ago | Discussions thread
MyM6II Senior Member • Posts: 1,627
Re: Long Lens for the M6 ii

nnowak wrote:

MyM6II wrote:

Maxmolly7 wrote:

Karen Casebeer wrote:

Thanks so much for your detailed input. It was really helpful. Right now, I feel I need at least the reach of 300 mm so I'm going to go with trying out the 70-300 ii.

Following your quest for some time now, I am convinced that 300mm will be too short for what you are trying to achieve.

Actually if you crop an image from the M6 II 32.5MP sensor down to 20MP (same as the RX10IV) and if my calculations are correct, you will get a longer reach with the 70-300mm on the M6II than you will get with your RX10 iV.

A little more explanation:

20MP from a 32.5MP sensor will use an area that equals a crop factor of 1.27. (32.5 long edge is 6960px and 20MP long edge is 5472px. 6960/5472= 1.27)

Now take this and multiply with the APS-C to FF crop factor. 1.27 x 1.6 = 2,04

So a 20MP crop of the 32.5MP sensor will have a FF crop factor of 2.04.

20MP crop reach: 300mm x 2,04 = 612mm


The Rx10 IV has a 220mm lens and a FF crop factor of around 2.7.

RX10 IV reach: 220mm x 2.7 = 594mm


Please correct me if I am wrong.


(for the record: That 20MP cropped area is also physical larger than the 1 inch sensor. So also larger pixels. I leave it to someone else , if interested, to calculate the real area based on the FF crop factor of 2.04)

Full frame area is 864 mm^2. To calculate the area of the new cropped area you need to square your lineal crop factor (2.04 X 2.04). The new cropped area is 864/(2.04 X 2.04) = 208mm^2. Basically the same as a m4/3 sensor which is 225mm^2


I was too lazy to calculate it last night. And I was not sure anyone was really interested. The result is close to what I would have guessed. But it is kind of interesting that the M6II sensor is almost a "two in one" sensor.

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