I'm looking for a tele zoom that auto-focuses with the E-PM1. My mini shows inconsistent IBIS so I'm thinking the Pan 45-200 OIS looks like a better choice than the Oly 40-150. Are there any other considerations? Any peculiarities with the Panasonic lens and Oly bodies? Forgot to add, I don't want to spend the extra for the 100-300. Thanks.