I strongly prefer Rollei Infrared 400 over Ilford SPF. With Rollei Infrared 400 is can get interesting differences between Red23, Red 25, Red 29 and 720.
Use box speed and a red filter. Take the light reading and adjust for the filter factor. I found that bright sun on the subject with the sun behind me always works well. At this wavelength IR, one does not need to adjust the focus.
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It is only greed in yours eyes because you think the price increase is too high without any knowledge about the facts or details that went into consideration.
Either the chimney or some form of prism gets rid of the stray light from a WLF. I bought my camera with a WLF and the two have never been together since 2007. Its lack of presents brings much joy.
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