Is there some reason you are only looking at Sironar? There are many other great lenses that might meet your needs. Check out a few at
www.subclub.org/fujinon/index.htm
My 4x5 macros run from a 180mm Fujinon A for close-up work (1:5-1:1), Minolta 100mm Bellows Macro (1:1-5:1), Minolta 50mm Bellows Macro (5:1-10:1), Minolta 25mm Bellows Micro (10:1-15:1), and Minolta 12.5mm Bellows Micro (15:1-20:1). The last two are really microscope lenses helped along with Leica micro lens designs. You might think that 35mm lenses would not fill a 4x5 format, but they do with enough extension -- and they don't need much. The results are phenomenal, even with very large prints. Sure, you will need one or two adapters (I have a Minolta-to-Leica adapter and a Leica-to-Copal #1 adapter) but this approach opens up a whole new world of possibilities.
So, I'd determine what focal length lens you want first, and then look to see what is out there.
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