Originally posted by clackers
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I have an SMC 50mm f1.4, Sigma 35mm f1.4, Samyang 24mm f1.4, Samyang 85mm f1.4.
I use them happily on APS-C Pentax and FF Sony.
Two are MF and three lack modern lens motors. And all four are FF focal lengths, not the APS-C equivalent. I was really thinking of lenses like the DA* 55mm f1.4 or the Fuji 23mm f1.4, lenses made with APS-C in mind. That's the point: if you want fast lenses on APS-C, chances are you will have to use FF ones. So, the companies whisper, why not move on to FF anyway, APS-C is for tourists with kit zooms, go on, the bank will love extending you a loan ... you know it makes sense,