Canon RF-S Mount

These are APS-C (RF-S) Canon RF-mount lenses. For full-frame Canon RF-mount lenses, see the Canon RF Mount page. Both RF-S and RF lenses use the same physical RF mount. Full-frame RF lenses can be used on APS-C bodies without vignetting.

These 2 Canon RF-S lenses are rated for infrared photography from real-world tests by IR photographers. Ratings are Good (2 lenses), Maybe (0 lenses), Bad (0 lenses), and Unknown (0 lenses) for hot spots, the bright spot some lenses leave in the center of an infrared image, and follow the thresholds below.

IR	Focal Length	Minimum Aperture	Lens	Filter	Weight	Notes	Images
Good	10-18mm	ƒ/4.5-6.3	Canon RF-S 10-18mm F4.5-6.3 IS STM KEH Adorama B&H	⌀49mm	150 g	Hot spots only at 10mm with an 830nm bandpass filter, and even then they are minor. At longer focal lengths they disappear. Bruce B	View images
Good	18-45mm	ƒ/4.5-6.3	Canon RF-S 18-45mm F4.5-6.3 IS STM KEH Adorama B&H	⌀49mm	130 g	No issues in either color or infrared-only images. Bruce B

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What the ratings mean. Hot spots usually appear as you increase the lens ƒ-number, so each rating depends on the lowest ƒ-stop where a hot spot shows and how severe it is, and the thresholds differ by sensor format.

• Good: No hot spots, or one that starts at ƒ/8 or higher where diffraction impacts image sharpness.
• Maybe: Contains a mild hot spot that starts between ƒ/4 and ƒ/5.6 and is correctable in editing.
• Bad: A hot spot that starts at ƒ/4 or lower, or is hard to correct in editing.
• Unknown: No data reported.

How reports are checked and rated