Hi Michiel, thank you for your suggestions. I will check those out.Hello Ric,
Not 400 mm but I have 2 300 mm lenses that work well.
The Olympus OM Zuiko 300 mm 4.5 and the Tamron SP 300 54B 1:5.6.
The Tamron is a great lens and not to big and balances very well handhold on the camera. It does not have it's own tripod connection, that is a pity, but because it is not to heavy you can use the camera connection with a steady tripod.
Cheers, Michiel
cheers
ric