Ghost arc with 300mm f/4D ED-IF

Started 10 months ago | Discussions thread
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newfounder
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Ghost arc with 300mm f/4D ED-IF
10 months ago

Since last November I saw every shots with this lens has a ghost arc at the bottom, a little to the left from the middle. If the back ground is white the arc is very visible. Here is 1:1 crop from a 4288x2848 shot. I opened the front and end cap and can't see anything there. I still think it's probably a dust over somewhere. Since this lens has instruction no not to blowing with dust blower I can't do anything. I bought from gray market nearly 3 years ago and nobody except me is responsible. So what's it and how can I get rid of it.

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