I would like some advice on whether to purchase a TC-17E II or a TC-20E II for my 300mm f/2.8 AF-S.
I'm not concerned about the slower AF speed. I prefer the 2X for the longer reach, but I am concerned about
the resolution and IQ.
2nd question. I have seen mention on this forum of a detox solution for cleaning lens contacts. What is its trade name, and is it available locally or must it be purchased on the web? Is it better than the eraser method?
Thanks,
Bob Mohr






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