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Roger- I remember now that the problem filter on the 100-400 was made by ProTama. I sent it right back for a refund so do not have the filter anymore but I think I kept the test images. If I have them I'll post or send.
This was a good lesson and now I only use Hoya or B+W pro-grade filters, but would not use any on the 100-400.
Last edited by John Chardine; 05-14-2009 at 11:53 AM.
Reason: added note
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