[coldtea]

>A 50mm 1.2 lens on a Canon APS-C body has a full frame equivalent focal length of 80mm and a full frame equivalent aperture of f/1.9 — giving it the characteristics of a comparatively inexpensive lens.

Only as it pertains to DOF. On the other hand, it will still be a 1.2 lens as far as light gathering is concerned.

And you can get a 35mm 1.2 for your 50mm equivalent on APS-C.

The loss of DOF we know, but you still so much DOF latitude on APS-C that you can do pretty much anything. Besides, that 50mm will become a quite handy portrait lens on APS-C.

[sjwright]

> you can get a 35mm 1.2 for your 50mm equivalent on APS-C

According to DxOMark[1][2], the $1400 Canon 35mm f/1.4 on an APS-C body is comparable to a Canon 50mm f/1.8 STM on full frame and stopped down to f/2.4.

[1] https://www.dxomark.com/Lenses/Canon/Canon-EF-35mm-F14L-USM-...

[2] https://www.dxomark.com/Lenses/Canon/Canon-EF-50mm-F18-STM-m...

[sjwright]

> it will still be a 1.2 lens as far as light gathering is concerned

Also incorrect, because less than 40% of the light gathered by a full frame lens hits the APS-C sensor.