Is the Panasonic 35-100/2.8 ii actually a 34-85 lens?

Hello.

Today I bought a second hand panasonic 35-100/2.8 m2 lens from someone on the web. The lens exterior looks fine, with only some small scratches on the metal casing. Test images also look sharp across the frame. Strangely, I noticed that the field of view is wilder than expected.

I did some simple testing, using two cameras, olympus em1.1 and em10.1, and several lenses I have, including olympus 75-300, 12-40/2.8, 14-42-R, and an old 50-200swd. From the viewfinder, and out-of-camera jpegs, the panasonic is wilder than my other lenses at the same focal lengths.

Essentially, the field of view with the panasonic at 100mm, which is zoomed to the end, is better matched by both olympus lenses at around 85mm, and definately wider than the two olympus at 100mm.

The wide end is also wider. At 35mm, again the end of the range, the field of view is more like 34 or 33mm on olympus 12-40 and 14-42.

Can someone with experience on this panasonic lens comment on the focal length issue? Is this normal for this lens? and will panasonic cameras crop the images automatically to produce 35-100 field of view?

Thanks in advance.

I remember reading that some lenses can be "shorter" at closer distances due to psychical design of lenses.

Thanks. I was testing against a map on my wall, about 2 meters away, surely a close distance. Is it "focus breathing" or something like that?

Hm, pretty dramatic breathing for this lens.