You asked
Is the voigtl nder nokton 35mm f 0 9 aspherical hard to focus manually?
The lens page lists the Nokton 35mm f/0.9 as manual focus only, with no autofocus, so you'll set focus yourself every time. At f/0.9 on APS-C it gives about the depth of field of f/1.4, so the zone of sharp focus is thin and you'll need to be precise. The site doesn't rate how easy it is to focus by hand, so that's a judgement you'll have to make yourself.
It fits a long list of Fujifilm X bodies, including the Fujifilm X-T5 and Fujifilm X-T30 III. You can see the full lens details on the Voigtländer Nokton 35mm f/0.9 Aspherical page.
If you'd rather have autofocus, my first lenses advice starts with a fast standard prime, which is much easier to live with day to day.
Written by Claude from this site's pages.