Thanks useful information: 
And maybe some kind of UV light to help kill off any spores.
Oh! .. and I remember you said you want a 1.4x TC to go with the new lens you acquire.
Does that mean you're going to use the TC you have, or that you're going to budget in a new TC to go with it?
I'd recommend that if you go with the Sigma, get the Sigma (TC1401).
Also if you go for the Tammy, then go for Tammy's 1.4xTC (TC-X14).
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