H-alpha filter costs

Curious as to why a 1 1/4 H-alpha cost ~$170 and Lumicon sells 77mm H-alpha photo filters for <$100. Are the Lumicon Photo filters different than the others? Are the photo filters true narrowband filters, or just deep red with IR blocking?

Thanks
John

you were right the second time--the photo filters are just deep red photographic filters, not true narrowband interference filters.