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Specifications of the Canon RF 24-105 IS STM emerge
We have our first details of the upcoming Canon RF 24-105 IS STM, and the first thing that everyone is going to key on is the aperture. Canon's designed this as a pretty slow variable zoom with a F4-7.1 aperture. Some certainly won't like it's small aperture on the telephoto end but then there is the 24-105 F4.0L, 24-70 F2.8, and 28-70 F2.0L for those folks. Canon has more of a need for this: a very small kit lens for the RP and upcoming R6 camera bodies. You may not like it - but this will take perfectly acceptable photos for a kit lens.
The specs we know, as compared to the Canon EF 24-105 IS STM F3.5-5.6 and the Canon RF 24-105 F4L immediately show why this lens is F7.1 on the long end. It's much smaller, and lighter than even the Canon EF 24-105 STM, and also considerably lighter and smaller than the Canon RF 24-105 F4L. There are obviously optical tradeoffs to get the lens this much smaller and lighter.
| |
Canon RF 24-105 IS STM |
Canon EF 24-105 IS STM |
Canon RF 24-104 F4L |
| Max aperture |
4-7.1 |
3.5-5.6 |
4.0 |
| Design |
13 elements in 13 groups |
17 elements in 13 groups |
18 elements in 14 groups |
| MFD |
.2m AF (.13m MF) |
.4m AF |
.45m |
| Magnification |
.4x AF (.5x MF) |
.3x |
0.24x |
| IS compensation |
5 stops |
4 stops |
5 stops |
| Filter diameter |
67mm |
77mm |
77mm |
| Size |
76.6x88.8mm |
83.4x104mm |
83.5x107.3mm |
| Weight |
395g |
525g |
700g |
Here is an approximation of the two RF lenses side by side. The IS STM lens looks almost like a prime.
We were also asked about Canon's other consumer zoom that is in this realm and why Canon decided to come out with a new Canon RF 24-105mm F4-7.1 when there's the pretty good Canon RF 24-240mm F4-6.3. Adding in the 24-240mm shows I think the primary reason Canon thought this lens was necessary.
This really highlights the difference in the two "kit" lenses. Small sells. Canon knows this from the EOS-M. They are certainly going to make a small kit lens for the smaller / cheaper, more consumer RF cameras.
Intriguingly the lens will have have the ability to focus closer than .4x but only with manual focus, down to 1:2 macro. It will be interesting to see how this works in practice.
More details to come. The announcement is expected near the end of this week.
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