Panasonic 100-300 or Olympus 75-300 (m4/3) Please Help!!!

1. I made the move to the m43 format to reduce the size and weight of my camera bag. The Oly 75-300 is considerably smaller and lighter than the Pana 100-300.

2. I got the E-M5 with 12-50 kit lens and did not want a large focal length gap between the long end of the 12-50 and the short end of my telefocus lens. 75mm is a lot closer to 50 than 100.

Reasons for not getting the Oly would be:

1. If you want to sell it later you will only attract Oly owners because the lens has no IS.

2. The aperture at the long end is small, so you need a lot of light.

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Slowly learning to use the Olympus OM-D E-M5.
Public pictures at http://debra.zenfolio.com/.