You asked
Is the voigtl nder apo lanthar 28mm f 2 aspherical good in low light?
The site doesn't rate this lens's low-light performance on its own, so I can't give you a verdict on it. What I can say is that it's an f/2 prime, which lets in plenty of light for a wide lens, and it's not stabilised, so you'll want to keep your shutter speed up in dim rooms.
Sensor size matters more here than the lens. At the same f-number, a full-frame body collects about a stop more light than APS-C, so the sensor guide is the best place to see why. If low light is the main job, pair this lens with a full-frame body such as the Sony a7 IV, the Sony a7S III, or the Nikon Z6 II. The Sony a7S III is the one I'd reach for first in dim light.
Written by Claude from this site's pages.