Keep 'em flying!!!
(Because I wouldn't want an Aero Tek falling towards 'me head!!!) :-0
Steve K
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I have done many 4x5 photos up to 1:1 magnification with a 135mm Nikkor-W lens. I've had much gratification with that as my limit. Setting aside all the discussion of best optics, at 1:1 your subject field is 4x5 inches if that is your format. It's 8x10 inches for an 8x10 camera. And the required bellows extension will be twice the focal length of your lens. So my 135mm lens at 1:1 needed (approximately) 270mm of bellows extension. A 210mm lens will need 420mm of extension. Furthermore, getting close as in the realm of the 35mm format involves magnifications much more than 1:1 and more like 4X or 5X magnification with 4x5. Getting this additional magnification will add a more complex set of issues, and cost, which is why I limit myself to 1:1 magnification.
Long ago I met a university Entomologist who had a set-up for photographing live specimens, for example flying insects. He had a thin steel enclosure of 5 sides, an electronic flash on each side, and a 4x5 camera with no bellows on a pair of rails. He could therefore use whatever extension he needed. He placed a blanket between the lens-board and body and usually exposed with room lights turned off.