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With regards to the canon 50mm f/1.4 and f/1.8 on any camera modified for wideband imaging/infrared filter removed.
The f/1.4 has a very noticible IR hotspot in its design compared to the f/1.8 which was the lens ive done about 95% of all my terrestrial IR stuff with.
Cant comment on the f/1.2 as i dont own it or know anyone who does.
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