Do EF-S lenses have the same 1.6× crop factor on Canon APS-C bodies?
Asked 11/20/2013
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I use Canon APS-C cameras (600D and 7D) with the EF-S 18-55mm kit lens and the EF-S 55-250mm. I’m considering buying the EF 24-105mm f/4L IS USM and want to confirm how crop factor applies.
Does an EF-S lens on an APS-C body get the same 1.6× field-of-view crop as an EF lens on the same body? For example, would the EF 24-105mm behave like about 38-168mm equivalent, and the EF-S 18-55mm like about 29-88mm equivalent?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
12y ago
2 Answers
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Your EF-S lenses would be subject to the 1.6x crop factor just as any EF lens would. So your 18-55 kit lens will never show an 18mm FOV, but closer to 29 on the wide end.
Originally by user9510. Source · Licensed CC BY-SA 4.0
user9510
12y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. On your 600D or 7D, both EF and EF-S lenses are affected by the same 1.6× crop in field of view.
Crop factor comes from the sensor size, not from whether the lens is EF or EF-S. The focal length printed on the lens is the true focal length either way. What changes on APS-C is that the smaller sensor captures a narrower portion of the image, so the view looks like a longer lens would on full frame.
So your examples are correct in full-frame-equivalent terms:
- EF 24-105mm on APS-C: about 38-168mm equivalent
- EF-S 18-55mm on APS-C: about 29-88mm equivalent
- EF-S 55-250mm on APS-C: about 88-400mm equivalent
The main difference between EF and EF-S is compatibility/image circle: EF-S lenses are designed for APS-C cameras and generally can’t be used on Canon full-frame bodies, while EF lenses can be used on both compatible APS-C and full-frame Canon DSLRs.
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