Infrared, first try

Today I shot a first roll of Rollei Infrared with my old Nikon F-801 with and without filters.  This image is shot with a Hoya R72 infrared filter, reduciing the light with 6 f-stops.  I also tried Wratten filters No. 25 and 29 - red and very red.  But the effect wasn't so strong.  The film was developed in Adox XT-3 1+1 for 8 minutes.