jcolwell Offline Upload & Sell: On
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I don't have an A7, but I do use flocked paper or flat, matte black paint to reduce internal reflections on adapters and such. The self-adhesive, flocked paper I use is designed for lining telescopes and does not "shed". I bought mine from Kendrick Astro Instruments in Canada, but they don't list it any more in their online catalogue.
It looks like this product at Edmund Optics, but I don't know if it is the same,
http://www.edmundoptics.com/lab-production/general-tools/light-absorbing-black-out-material/1502
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