Hey all I just got this Century 2000 Canon 400mm and when I try to focus wide open on a near mountain or over a mile away I can't seem to get it to go as sharp as say the trees only a few hundred yard away. The focus barrel stops and I need to have it go just a little more to get it sharp. Anyone have this lens and the same experience? I changed the back focus on my Epic to get the mountain in focus but then all my zooms and other lenses are not working as planned. I have a Canon 300mm FD Century PL conversion and the focus marks seem correct so Im thinking its the 400mm. Is there anything I can do here on location short of changing the Back focus every time I want to use the glass or will it need to go and get looked at.
PS I checked all the mounts and parts to make sure they are all lined up and correct.
And should I just send it off to Century to have them take a look at it?
Thanks all for any info.