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Anonymous
>>195441 Not to be a jerk, but if you can't afford to shoot a couple rolls of black and white film, you sure as hell can't afford to ruin a few rolls of IR film at $15-20 per roll and $15-20 each to develop while trying to figure out how to work it.
Focusing with IR is only different sometimes. As was mentioned, IR light focuses at a different point than visible light. Since IR has a longer wavelength than visible light, it focuses slightly behind where visible would. If you're using an IR-only filter like an R72, R82, or exposed slide film, you will need to adjust your focusing by first focusing in visible light (with the filter removed, obviously) then turning the focusing ring to align with the IR focusing mark on the lens. If you're shooting without a filter, or with a red 29 or 25 filter, there is enough visible light that you don't need to compensate for focusing. Just shoot stopped down to f/11 or more and don't take pictures of anything really close to the camera. To further complicate matters, some lenses (almost all modern ones) lack the necessary IR focusing dot to do the compensation. In that case, you just have to figure out through trial and error how much in what direction you'll need to adjust the focus, then either add your own mark or just remember how much you need to turn the ring.
The other thing I forgot to mention in earlier posts is developing. You'll have to get it done at a pro lab that knows how to handle IR film. It requires special handling, so any lab that doesn't know exactly what they're doing will likely ruin it. It also doesn't have a rated ISO speed, so it will have to be developed according to how you shot it- the corner drugstore probably won't know how to do this. Since it takes special handling, labs tend to charge a lot to process it. Of course this can all be fixed by doing your own developing.
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