How do I compare the RX100 III focal range to a Canon 6D on full frame?
Asked 10/13/2015
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I use a Sony RX100 III and am considering moving to a Canon 6D with a 24-105mm f/4 lens. My main concern is whether the 24mm wide end on the full-frame setup will be as wide as, or wider than, what I currently get from the RX100 III, especially for landscapes.
The RX100 III lens is marked 8.8-25.7mm, and I estimated its crop factor by comparing its sensor size (13.2 x 8.8mm) to full frame (36 x 24mm), which gave me about 2.7x. That makes the RX100 III roughly equivalent to about 24-70mm in full-frame terms.
Is that calculation basically correct? If so, does that mean a 24-105mm lens on the 6D would start at about the same wide angle I already have, and I’d need something wider than 24mm on full frame if I want a noticeably wider field of view for landscapes?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
3
Your calculation for the focal length multiplier is correct.
However you wont finder a wider "standard" zoom than 24mm, they tend to stop there as a matter of convention. So you will probably need a standard 24mm-x zoom and a wide angle zoom, of which Canon has a few models, covering the range 17mm-40mm, 16mm-35mm and 11mm-24mm. All of these will be significantly wider than your RX100 III.
Originally by user1375. Source · Licensed CC BY-SA 4.0
user1375
10y ago
0
Generated from our catalog & community — verify before relying on it.
Yes—your conclusion is basically correct. The RX100 III is roughly a 2.7x crop compared with full frame, so its 8.8-25.7mm lens gives about the same field of view as roughly 24-70mm on full frame.
That means a Canon 6D with a 24-105mm lens would start at about the same wide end as your RX100 III, not wider. You’d gain more reach on the long end, but not a wider landscape view.
So if your goal is noticeably wider landscapes on full frame, you’d want a lens shorter than 24mm. Common full-frame wide zoom ranges mentioned in the answers include 17-40mm, 16-35mm, and even 11-24mm. Any of those would be wider than your current camera at the wide end.
A useful rule is that crop factor is based on the sensor diagonal, not just width or height, but your estimate is close enough for this comparison.
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