Focusing with an IRIX 15mm f/2.4 +10mm extension ring possible?

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Egg Salad Regular Member • Posts: 186
Focusing with an IRIX 15mm f/2.4 +10mm extension ring possible?

Ahoy, people of Canon.
I'm a Sony shooter but I'm about to buy this lens in Canon mount to adapt it. I'm crazy for close-up shots, but the IRIX only goes down to ~1:9 maximum magnification. Can anyone tell me if it's possible to attain focus with a 10mm extension ring?
With my Tamron 24-70 it only just works near infinity (going closer, the focal point would be inside the lens), but since there is a huge difference between 15 and 24mm, it might not work at all.
Thanks!

 Egg Salad's gear list:Egg Salad's gear list
Sony a7 III Sigma 105mm F2.8 EX DG Macro Carl Zeiss Makro-Planar T* 50mm F2 Samyang 8mm F3.5 Aspherical IF MC Fisheye Tamron SP 70-200 F2.8 G2 +5 more
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