So, inspired by some of the great macro shots on the forum lately, and disappointed with my own results from admittedly brief use of a few close-up filters, I did a little more research and spotted a potential budget-friendly solution to two of my desires in photography right now. (1) I would like a decent macro lens, and (2) I would like a telephoto beyond the SEL55210 (but below telescope reach). The answer I thought of was... well, the thread title gives it away: the Vivitar 2X Macro Focusing Teleconverter. From what I've been able to gather from information floating about on the web, the Vivitar 2X Macro Focusing Teleconverter - the 7 elements in 5 groups version, not the plain Vivitar 2X-5 Teleconverter - is fairly well regarded as a teleconverter and macro focusing extender. It may not be quite up to the optical standards of the Minolta 300-S as far MD mount teleconverters go, but everything I read was encouraging. The notion to attempt "killing two birds with one stone" was too much. So last Friday I ordered one from KEH. It arrived this morning before work, leaving me no time in the sunlight to test it out. But this evening, upon returning home, I unpacked it, mounted my MD 50mm f/2 on it, mount the interesting combo to my a3000, and tried a few test shots. First checked it on a focus target I printed off the web (oh, yeah, you say). That was encouraging, so I scrummaged around for some appropriate near-1:1 test article and settled on... a shiny new penny. Untitled by SRHawk64, on Flickr (EDIT: BTW, this is a straight SOOC JPEG, no PP, no cropping) I basically jury-rigged an impromptu macro "studio" setup with my tripod, an LED lamp, two LED mini-flashlights (on the sides), and a placemat set on our dining room buffet table. While the results are not awe-inspiring, and there is noticeable CA, and perhaps some soft focus on the edges, I am very pleased so far. This is much better than I managed with close-up filters. Easier to focus too. Is it a match for the well-regarded Minolta MD Macro 100mm f/4? No. But is it workable for me? Yep! And, uh, is my math correct in causing me to believe the 2X converter turns the 50mm f/2 into the equivalent of a 100mm f/4? Tomorrow morning I'll try some more test shots, both telephoto and macro. Maybe even some flowers and bugs.