Been (If you pardon the pun) using them home made for years, don't see any justification in the high prices they charge for a commercially manufactured product that is rarely satisfactory anyway! I make them quite large to fit over my car window. I regularly use my 500 + 1.4 converter on this arrangement, I even use the 2x converter on occasion, very stable unless you start to rock the car.
nirofo.
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