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Canon continues to develop optical designs which utilize internal zoom setups. Internal zoom is the favoured design for a lot of shooters, as there is always continuity with the lens when shooting with it. Telescopic zoom lenses can save you a lot of space in the bag, but there are compromises when using one.
We have two new internal zoom optical design patents, one of th elenses is full-frame and other is APS-C.
Both of the original RF 70-200mm f/2.8/4 lenses are super compact, but have telescopic zooms. That was more of an issue with sports shooters and the “throw” of small f/2.8 lens.
Canon seems to be working on an internal zoom RF 70-200mm f/4L IS USM Z. The design is still quite small, and only about 3cm longer than the original RF 70-200mm f/2.8L IS USM.
Canon RF 70-200mm f/4L IS USM Z
- Focal length: 73.68mm – 194.48mm
- F-number: 4.10
- Half angle of view: 16.36° – 6.35°
- Image height: 21.64mm
- Total length: 198.01mm
- Back focus: 49.13mm – 65.78mm
The second lens that looks interesting is a RF 18-50mm f/4 IS for APS-C sensors. A nice constant aperture lens with small size and weight? We think it would do well should it ever make it to market.
Canon RF 18-50mm f/4 IS
- Focal length: 18.54mm – 52.02mm
- F-number: 4.10
- Half angle of view: 33.06° – 14.50°
- Image height: 13.66mm
- Total length: 130.47mm
- Back Focus: 14.72mm – 14.72mm
