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Voigtlander FE 35mm f/2 APO-Lanthar Aspherical Aperture Series: Deck Planks and Ruler Focus Shift Evaluation

Update May 6: see Voigtlander FE 35mm f/2 APO-Lanthar Aspherical: what looked like inexplicable focus shift is shown in part to be Focus Creep / Unstable Lens Focus.

Voigtlander FE 35mm f/2 APO-Lanthar Aspherical

Original post...

This aperture series from f/2 through f/8 takes a critical looks at focus shift with the Voigtlander 35mm f/2 APO-Lanthar, finding some surprises. Well, not entirely—I had seen oddball sharpness results with stopping down in some other series at greater distance, so I decided to investigated—sure 'nuf.

Voigtlander FE 35mm f/2 APO-Lanthar Aspherical Focus Shift Evaluation Planks

Includes images up to full camera resolution plus crops.

I’m dumbfounded at the results as I expected no focus shift—but I can repeat at-will on varying subjects. Users of the Voigtlander FE 35mm f/2 APO-Lanthar will definitely want to be aware of this behavior. Maybe it is a weird sample? I haven’t seen behavior like this before.

Another example, with a ruler in millimeters for seeing the shift in a more obvious way:

Voigtlander FE 35mm f/2 APO-Lanthar Aspherical Focus Shift Evaluation: Ruler and Soil

I have a 2nd sample coming in two days that I can also test to see if it somehow sample specific. I doubt that, but very high performance designs possibly could do weird things if off just a little. But if so, I cannot explain the razor sharp 'cut' this sample makes at f/2 across the frame.

CLICK TO VIEW: World Class Optics for Sony Mirrorless

Deck planks are warped as seen—this is not optical distortion.

Tigger near Garlic play area
f2 @ 1/2500 sec pixel shift, ISO 100; 2021-05-02 13:15:45
Sony A1 + Voigtlander FE APO-Lanthar 35mm f/2 Aspherical RAW: +30 Whites, +15 Clarity

[low-res image for bot]

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