Does a crop-sensor body change a lens’s minimum focus distance or magnification?
Asked 2/4/2013
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I’m using a Canon 100mm f/2.8L macro lens on a Canon APS-C DSLR. Since the crop factor makes the field of view similar to a 160mm lens on full frame, does that also change the lens’s minimum focusing distance? For example, would the minimum focus distance become longer on the crop body? Also, is there any accessory that can magnify the optical viewfinder image to help with focusing?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
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The minimum focus distance is a property of the lens and the distance to the sensor. The lens-to-sensor distance is the same for all Canon DSLRs hence the minimum focus distance doesn't change when using a cropped sensor body.
There are adapters you can get to magnify the viewfinder image, here's a review of an offical Canon product, numerous third party alternatives are available. If you have a DSLR with liveview then you can magnify the image very easily using the camera settings.
Originally by user1375. Source · Licensed CC BY-SA 4.0
user1375
13y ago
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Generated from our catalog & community — verify before relying on it.
No. A crop-sensor body does not change the lens’s minimum focusing distance. Minimum focus distance is a property of the lens design and its distance to the sensor, and that does not change just because the sensor is smaller.
What does change is the field of view: the APS-C sensor crops the image, so the scene looks tighter, like a longer lens on full frame. But the lens is still a 100mm lens, and its maximum magnification does not change either. With a macro lens, you still get the same reproduction ratio; the smaller sensor just captures a smaller portion of the image circle.
If you want the viewfinder image to appear larger, you can use an eyepiece/viewfinder magnifier made for DSLR optical viewfinders. If your camera has Live View, that is often even better for critical manual focus because most cameras let you magnify the live image on screen.
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