After trying out the Olympus 14-150 lens on the GX7 I decided the Tamron was next. I thought I had a problem with the Olympus lens after it's been used quite a bit in the last few years that I've had it. Now I'm not sure because I've been using it on the Olympus E-M5 body. The Tamron doesn't perform too well on that body either so I'm now thinking that the E-M5 isn't working the way it should be.

Having now tested both lenses on the excellent GX7 I really can't tell the difference between the images. So, if you're looking for an all-purpose lens for vacation time, you can purchase either of these lenses. The Tamron is a little thicker than the Olympus but has a good feel to it. Both don't have ILIS so I would think using these two lenses on Olympus bodies makes more sense. Having said that I had good results on the GX7 which has a form of IBIS but is not as good as in the Olympus bodies.

The following few posts will show the image quality from this lens.