Infinity focus with 4/3 to m4/3 adapter

drj3 wrote:

darrinlingle wrote:

I did a search on this and didn't find any answers.

I just sold a good Panasonic 12-35mm f/2.8 lens because of how difficult it was to use in astrophotography (mainly no distance scale). Now that I have an Olympus 12-60mm f/2.8-4.0 with 4/3 to m4/3 adapter (MMF-3), i cannot get any sharp images, day or night at infinity focus. when focusing about 5 feet at my dog, he comes in very sharp. I'm using a full spectrum Olympus e-pl6. is this lens too far away from the sensor for infinity focus?

The distance markings are approximate and it will focus beyond infinity (on FTs cameras as well). It has mechanically linked focus, so you can correct focus in any focus mode. It is true of many (most?) modern lenses. One reason often given is to allow expansion/contraction with temperature changes and still allow infinity focus.

i tried focusing, with manual focus magnification (setting) on. the best image i could get was when the focus ring was maxed out past infinity. i tried the whole range and anything far away (over about 30 feet) looked very blurry in the camera. i then put the files on the computer. the 5ft distance photos looked very very sharp. the best long distance subject looked terrible. a long time ago i heard that some brand lenses won't focus to infinity using an adapter because the lens is too far from the sensor. is that what i'm running into or am i way off?