I didn't do it by myself. I ordered one at local shop that specializes on advertisement materials. They sell lots of self gluing films, light boxes, etc. They also offer laser cutting services. The 10" one made of 3mm acrylic cost me around $30 to cut. You can also cut one from thick plastic sheet with x-acto knife, but that's not very easy. Though my friend cut 150mm one without too much trouble (he is very diligent). You can also glue black stripes of paper over the mask instead of cutting them.
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Re: Revolutionary new way of focusing! No less!
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