I used Rollei infrared 120 film in the Mamiya, and a hoya R72 infrared filter to shoot these photos. With the filter on you can not see anything as it blocks nearly all visible light, you can see the sun if you look directly at it but that's about it. Metering was very much a guess work so I'm suprised how well some of these came out for a first time shoot. Now that I have a basis for exposure I should be able to furthur refine it. Most of the good photos I metered at 400iso with 6-7 stops of ND.