Here is a Canon RF 100-500mm review. The recently announced Canon RF 100-500mm f/4.5-7.1L IS lens seems to be a rather interesting and well performing lens.
Coming from Gordon Laing, the 29 minutes video-review below looks at the Canon RF 100-500mm from all possible points of view and compares it to the EF 100-400mm lens. Gordon seems to be pretty fond of the RF 100-500mm, calling it the “best RF telephoto” lens. In any case a powerful option for the EOS R system.
[…] a full review of the Canon EOS R5 full frame, 45 megapixel mirrorless camera for underwater photo and video. The R5 has some of the best specs on the market including 45 MP still images, 8K video @ 30P with internal RAW recording, 4K video up to 120fps, 5 axis in-body image-stabilization, and more!
The staff at Bluewater Photo and the Underwater Photography Guide took the Canon EOS R5 diving in the cold waters of the Puget Sound, Washington to put it to the test and see just what it could do. We’ve been very impressed with the underwater footage that we captured. However, we do think that the marketing by Canon for the R5 should have been done differently – this is a spectacular still camera with amazing video features, but it should not be relied on for the video features that were initially marketed.
Well, at least underwater the heating issue should be under control ;-)
For once we feature a review of an EF optics, and not of an RF lens. The Canon EF 70-200mm f/4L IS II.
Coming from Christopher Frost Photography, the 9 minutes video below examines the Canon EF 70-200mm f/4L IS II lens for both full frame and APS-C cameras. Some sample pictures are included. Says the reviewer:
I would never buy a 70-200mm f/4 lens – I like to shoot at brighter apertures – but I still love using them, they’re great fun. Is this most recent of Canon’s one of the best ever made?
Roger Cicala says that the weather sealing “seems to be a step up from anything we’ve seen before“. And that means also that there is little opportunity for the heat to escape. Mr. Cicala explains it:
There seem to be two separate heat sinks, one under the voltage board, another between the main PCB and the sensor assembly, with thermal pads to direct heat to each. At least one of them connects to the tripod plate, which might provide a secondary sink. This is a lot of heat sink compared to most photo cameras, but not even a fraction of what we see in a video camera. What I can’t tell from this is how that heat then gets out of the camera. It’s sure not air circulation.
Given how tightly sealed things are, I’m curious as to where the heat goes to get out of the camera; some further investigation is required there.
I’m a simple person. All I can think of is, ‘how does the heat get out of the camera?’ Sure it goes into the metal sinks, but once they heat up, then where? In a small photo camera, there’s not a lot of ventilation/convection current to get let the heat out. This camera is better sealed than most; I doubt there’s very much ventilation at all.