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Some Canon and other lenses tested on a Canon 20D camera converted to IR with a 720nm filter.

Canon Lenses

EF 50mm 1.4 prime: Only good at f5.6 and below (possibly 2 stops more sensitive than EFS 18-55mm).

EF 17-40mm 4 USM L: at focal lengths less than 28mm OK at f8 and below; at focal lengths greater than 28mm OK at f11 and below, otherwise doubtful.

EFS 18-55mm 3.5-5.6: Good at f11 and lower f nos over 18-55mm; possible at f22 at 55mm.

EF 24-105 mm 4 IS USM L: Good at f8 and lower at 24-55mm; possible f5.6 and lower at 105mm; no use on high f nos. EF 70-200mm 4 IS USM L: Good at f4.5 70-100mm, possible at f8 over full range, otherwise no use.

EF 75-300mm 4-5.6 IS (old lens ca 1985): Good at f8 and below at 75mm; possible at f8 and below at 300mm. NON -CANON LENSES:

Sigma Lens 70-300mm APO DG 4-5.6: Good at f5.6 and f4.0 at 70mm; good at f11 and below at 300mm.

Pentax Super Takumar lenses ca 1965. 50mm 1.4; 28mm 3.5; and 135mm 3.5: all of these lenses perform well with either no or verlittle hot-spoting. However, there is no auto focus and no automatic evaluative metering.

Note on Methodology:

Testing was carried out by taking a series of shots at different aperture and focal length settings using a well lit scene having good tonal variation. Each image was then visually checked using Canon's Digital Photography Professional software, making alterations to enhance the presence any hot spot. An aperture/focal length combination was considered acceptable if there was either no hot spot visible at all or of such faintness that it could be easily missed.

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