Focus question and advice please!

Started 2 months ago | Questions thread
OP mtakeda Regular Member • Posts: 332
Re: Focus question and advice please!

Erik Kaffehr wrote:

mtakeda wrote:

10um means 0.100mm?

No, 10 um means 0.01 mm.

The pixel size on the GFX is 5.3 um (micron) that is 0.0053 mm. Choosing allowable CoC to be around twice the pixel size may be reasonable.

Now, using 0.010 mm as allowable CoC would yield a hyperfocal distance of 23 m, or 74 feet.

So, how do you focus at 23 m / 74'? The laser distance meter Jim suggests using may be helpful. You would try to find a rock that is 23 m from the camera and focus on that.

Diffraction will soften the image at small apertures.

That said, if you look at an image at actual pixels on a 2k 24" monitor, it would correspond to a 64"x48" print. If you have a 4K monitor it would be looking at a 32"x24" print.

Does actual pixels mean “ fit” or “1:1” in LR viewing?

Best regards

Erik

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