>>3709794>>3710021pretty much all manual focus lenses have an IR index on the DoF scale. it's usually a red dot or dash, or a continuous red line in case of zooms.
most instruction manuals of old manual SLR used to have a part on how to focus using an IR filter.
>>3709772look for a 35mm lens! the minolta MD/MD rokkor 35/2.8 lens is pretty nice. lies on a sweet spot not as tight as a 50mm but not as wide as a 28mm.
there's a faster f1.8 version but it's expensive as fuck.