04-21-2020 05:52 AM - edited 04-21-2020 05:57 AM
I know that aperture values have nothing to do with the type of lens mount 😂
I was referring to the fact that the circuits of teleconverters (or speedboosters) act like a middle man, so the camera couldn't identify whether the lens attached is an ef lens or ef-s lens.
There is no middle man in an extension tube or in a reverse mount adapters, hence the camera will identify whether the lens attached is an ef lens or ef-s lens. 😉
i'm afraid a lens like 50mm won't be as good as a wider lens like 18mm in lens reverse situation.
I'll show you some results.
this is the maximum magnification of a canon 100mm macro lens (Not Reversed 1:1 magnification)
this is 50mm f/1.8 Full frame lens reversed ( wich was your sujestion)
this is 18-55mm EF-S lens reversed @18mm
so, imagine the result of 10-18mm EF-S lens reversed @ 10mm