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It depends upon how you use the long focal length lenses. At relatively close distances most of the m4/3 lenses are sharp enough. Problem comes when shooting near infinity. Thermal waves ruin even the best glass. It does not take much to get thermals either, I've gotten them in cooler weather with not much sun. Surprised me. Unfortunately, those are the conditions I shoot the long lenses with the most.
Aside: much impressed the Pana 45-175. Did not like on GH2 due to stabilizer problems. On the OMD it rocks. Here is a shot I took today. 129mm, 5.6, 1/250, iso800 - heavy fog here today.
My wife and I took a trip this past August to Glacier NP and got a lot of great images with a Nikon D3s and a 28-300 lens. The camera was great of course but I was sorely under glassed for shooting out there. I now have all the good M4/3 glass that everyone here is shooting (just added the Pana 35-100), and I'm very pleased with that range of focal lengths.
I am just hoping to find a decent long lens to take on those types of trips where I might want to capture a moose or grizzly without having to crop the image to death. Of course, those types of shots are going to be long distant ones.
Nice crisp shot of the cow! I'm just afraid the 45-175 wouldn't be long enough. I have a Panasonic 100-300 on hold at my local pro shop, and I plan to check it out on Friday.
Thanks for the info!