In a few weeks my wife and I are heading to the Yukon and Alaska for whatever time it takes to see what we gotta see(nice to be retired). I've been looking at different wide angle lens for all the landscape we will see. I bought the sigma 19 but I am returning it. I love the sigma 30 but the 19 isn't doing for me. I am really interested in the V15mm 4.5. I read some people have color problems than I see people on flickr with a 5N that have amazing photos. Any opinions on this lens would be appreciating. Also is the adapter I would need Leica M to Nex?