Man pages matching name pto_lensstack in section 1:

pto_lensstack.1.en	debian 10 / hugin-tools
pto_lensstack.1.en	debian 11 / hugin-tools
pto_lensstack.1.en	debian 12 / hugin-tools
pto_lensstack.1.en	debian 13 / hugin-tools