The flange focal lengths of Fujinon's 210mm lenses range from 189mm to 210mm -- up to a 20% difference.
The flange focal lengths of Fujinon's 360mm lenses range from 352mm to 359mm -- up to a 2% difference.
2%? I could blow off. 20%? No way! On my Fujinon 600mm, there is a 36% difference. That's not walking on thin ice, that's trying to walk on water! But the decision is up to you!
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