The Minolta Rokkor-X 45mm f/2 is a small vintage lens ideally suited to infrared photography due to its lack of hot spots.
The vintage lenses and adapters that I have used for Infrared Photography. All have no hot spots in infrared.
Infrared photography with Soligor Wide-Auto 35mm f/2.8 and Soligor Tele-Auto 135mm f/2.8, no hot spots, great with mirrorless cameras, and affordable.
Shooting and editing color infrared photography with a vintage Nikon Nikkor-N Auto 24mm f/2.8, adapted to mirror-less camera converted to infrared.
Shooting and editing infrared images with a vintage Canon New FD 24mm f/2.8 lens adapted to a mirrorless camera converted to 590 nm.