K5ii with Sigma 17-70: what is happening here?

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henkwo Junior Member • Posts: 25
K5ii with Sigma 17-70: what is happening here?

During a recent trip to Rome I got some inconsistent results with my Sigma DC 17-70 2.8/4.5 (the old version) on K5ii. See pictures below: I seem not to be able to get proper focus in reddish / brick surroundings. These are examples, of both types I have 5+ similar results.

Btw: during an earlier trip I noticed that this lens struggles with artificial light, where in some instances I could not obtain proper focus even with 5 tries, while I could with other lenses.

Can anyone explain; am I doing something wrong, or is this a known phenomenon?

Any suggestions welcome!

Henk

k5ii, sigma 17-70, 17 mm, 1/160, f6.3

k5ii, sigma 17-70, 17 mm, 1/80, f4.0

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