Lens For Canon 5d Mark Ii

Paul asks…Having a problem with Canon 5d Mark II?I just got a Canon 5D mark II. I tried using my 18-55mm that was on my rebel and when looking though the view finder I can only see a small circle, and not the full image. When I take a photo I see the full image. I thought it might be because it was an older lens and I am using a full frame camera now. I purchased a Tamron 70-300mm today and its doing the same thing! I ve read other reviews and people have used this lens with there 5d...Whats

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