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Anonymous
>>108775 You don't need an IR filter. If you use no filter, it will look more like normal black and white film but with halos. A good compromise that gives darker skies but still lets you see through the viewfinder and focus is a red 25 or red 29 filter.
There aren't many IR films on the market anymore, but a couple of them have antihalation layers so you need to pick the right one. Kodak High Speed Infrared (HIE) and Macophot are the only two that I know of that have no antihalation layer.
Situations in which you have a bright or light colored subject against a darker background will produce the effect more visibly. The stronger the contrast between the subject and the background, the brighter the halo.
Bracket your exposures widely, metering for IR film is a challenge. I usually rate HIE at ISO 400.
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