Is the voigtl nder septon 40mm f 2 aspherical good on aps c?

On APS-C, the Septon 40mm f/2 Aspherical works and gives you a view like a 60mm lens on full frame. Its f/2 behaves like about f/3 for depth of field there, so you get less background blur than the number suggests. That's a tighter, slightly longer look than the 40mm name implies, which suits people and details better than wide scenes.

It's manual focus only and not stabilised, so it asks more of you than an autofocus kit lens. It fits Sony E and Nikon Z APS-C bodies, including the Sony a6400 and the Nikon Z50. If you want to check how the crop changes your framing and blur, the focal length converter walks through the maths, and sensor sizes explains what the smaller sensor trades away.

Written by Claude from this site's pages.