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Fujifilm GFX Focusing Precision and Aperture Series with GF 120/4: View to Mt Whitney From Alabama Hills

Fujifilm GF 63mm f/2.8

In Fujifilm GFX Focusing Precision and Aperture Series with 63/2.8: View to Mt Whitney From Alabama Hills, I showed the erratic focusing issues of the Fujifilm GFX with the GF 63/2.8.

This series shows the severe focusing errors that are commonplace with the GFX + GF 120/4. And this was the second brand-new GFX with the second brand-new 120/4. The first pairing had terrible problems also.

The variability shown here was observed over and over in the field, a great source of aggravation because it becomes hit-and-miss to obtain optimal results. The greatest errors occur at distance where focusing precision is at its worst, and where tiny changes in focus can make a big difference.

Fujifilm GF 120mm f/4 Aperture Series: View to Mt Whitney From Alabama Hills (Focus Variability)

Image sizes up to full resolution from f/4 through f/8, along with crops.

See also Autofocus and Manual Focus in the Field.

I still have not heard a peep from Fujifilm. I never believed the original GFX problem diagnosis, now disproven as a theory given the same misbehaviors proven with a 2nd brand-new GFX and 120/4. How this level of junk focus ever made it out of the testing lab is chocking.

As shown below, Mt Whitney is just out of sight on the right side of the frame, visible in a similar shot with the GF 63/2.8. The peak about 1/3 from left is 12944' = 3945m Lone Pine Peak. Because it is closer, it looks higher than 14505' = 4221m Mt Whitney which is the highest peak in the lower 48 states. Still, White Mountain Peak at 14252' = 4344m is nearly as high and rideable to the summit on a mountain bike.

View from Alabama Hills towards Mt Whitney area
f4 @ 1/1700 sec, ISO 100; 2017-04-02 07:25:36
GFX 50S + GF120mmF4 R LM OIS WR Macro @ 95mm equiv (120mm)

[low-res image for bot]
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