Was dredging through some old forum posts on this, and found a good list from about 2002 - but for some reason it wouldn't let me reply... maybe too old or something?Anyway, thought I'd re-post this list, both for convenience, and because I have a question about another lens not on here: - the EF-S 17-55mm f2.8 IS USM... does anyone have any experience with using this lens for IR, and if so, does it give a hotspot?GoodCanon EF 17-40mm f/4 L Canon EF 24-70mm f/2.8 L Canon EF 28-135mm/3.5-5.6 IS Canon EF 28mm f/2.8 Canon EF 50mm f/1.8 MKI Canon EF 50mm f/1.8 MKII Canon EF 70-200mm f/4L Canon EF 75-300mm/4.0-5.6 IS Canon EF 135mm f/2L Canon EF 100-400mm4.0-5.6 IS L Canon EF 100mm f/2.8 macroBadCanon EF 16-35mm f2.8 L Canon EF 20mm f/2.8 Canon EF 35mm f/2 Canon EF 24-85mm f/3.5-4.5 Canon EF 28-70mm f/2.8L Canon EF 28-105mm f/3.5-4.5 Canon EF 35-80/4.0-5.6 Canon EF 50mm/f1.4 Canon EF 50mm/f2.5 Macro Canon EF 70-200mm f/2.8L IS Canon EF 85mm f/1.8 Tamron 70-300mm f3.x-xxx Macro