Last but not least i added the EF-42 flash which guives a poerfect TTL light at 200mm+R250 at f16, sample below
Great really
Because I had quickly a vignette with my trekkin lens 18-135mm I never tried wit 55-200 your post pushed me from lazyness..
the ruler taken at 200mm minimal dstance allowed R250 ratio 1.58 no width grop just taken the center of the height, handheld of course...
Since ni vignette appeared in the 55 200mm interval this lens with either 150 or 250 allows a great flexibility for macro framing
Adding the cobra allows increasing DOF
I just need now a Godox 685 for HSS outside
These findings really push my macro shooting perspective while trekking
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Good judgment comes from experience
Experience comes from bad judgment