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I own both the 100-500 and the 500/4 L ii. I think both lenses are magnificent with a few quibbles. With the 100-500 it is the POS tripod ring which a month ago let go over frozen asphalt and which pissed me off enough with Canon to start looking seriously at Nikon Z8's and 600/4 TC's and...

Something which bears consideration when speculating on Canon's flagship camera is Canon recently announced production of their latest chip making machine. It appears it is reasonably competitive to market leader ASML with respect to how fine the internals of the chip can be. ASML extreme UV...

But introducing more sets of rules to accommodate special circumstances, such as smaller targets for increasingly longer focal lengths, can distort results. Perhaps a lens is designed to maximize performance at closer distances, an example is the Nikon 200-400 lenses without built-in...

Back in olden times (days of film) the lens chart testing standard was 50 times focal length for distance between chart and film plane. I believe TDP is operating similarly. However, one can quickly see where 50 times the focal length could be a problem. Not so for a 10-20 lens. The chart...

It looks as if a person could put a filter on this puppy, 77 mm diameter. If so, it could be very useful, especially given size and weight are reasonable and coma looks as if will be well controlled. Might be a great night sky and extreme landscape lens.

Right now the 28 macro is the lens on my M6. We had several days of great hoar frost and that little macro was perfect lens for carrying around with the R5 and 100-500 on the other shoulder. The other favorite lenses for the M6 are the 32/1.4 and the 18-150. The 32 is just spectacular and...

In keeping with the original line of the thread, a few weeks ago there was post about several patents for lenses of the 200-800 variety. As pointed out earlier, one of them was for a 200-800 5.6-8 which was very highly corrected, certainly of L quality. However, it was an external extension...

On the subject of Nikon's fluorite use, Nikonian Thom Hogan has written Nikon (and Sony) are most likely getting the fluorite from Canon as Canon is the only producer of large crystal fluorite for optical use.

I noticed there did appear to be two rings like the standard control ring, which is white on white lenses. But the texture of a white control ring is damn near useless for focusing. In fact, I have placed a 3M safety tread material on the focus ring of my 100-500 to make it more easily...

I see only one black ring. Trombone zoom like the original EF100-400/ 4.5-5.6?

A power zoom may be useful to wildlife photographers setting up camera traps and monitoring it through a CamRanger from a couple of hundred yards away. A person might get a bit nervous about using this lens in that manner, however, given the expense. Grizzlies, for example, have an...

I very much appreciate longer descriptions. I used to enjoy reading and studying the patent applications (weird I know) but recently anything more than the English overview does not come up for me and a server overload screen does. So more is better if you can provide and maybe a quicker...

Figure 25 of the 135182 patent showed a quite compact lens which had internal zooming. Following were a couple of more figures which seemed to show it to be very well corrected. Sounds like an Elle lens. The others were all external zooming, some appearing more compact than other and not...

Does not look like an internal zoom 200-800 is planned. The patent clearly is for an extending zoom. But, by going to an extending zoom Canon was able to make a pair of RF 70-200 zoom extremely small and light while maintaining optical quality and a remarkably light and compact 100-500...

Quad pixel AF would be really helpful. Frankly, the specs as listed sound more like an R1. An R5ii at 45-50 MP and a stacked sensor sounds about right for the $3800-4000 price range. (see Nikon Z8). Throw in quad pixel on an R5ii and you would have an extra couple hundred dollars of value...

Perhaps, but the onboard processing, the stack, might benefit as might the camera cpu. Semiseriously, wonder why some camera manufacturer has not approached Apple to by the processor for the previous year's iPhone. Just a couple of day's output of that processor line. Those suckers have...

In the months prior to the release of the R3, there were stacked sensor patents reported here. At least one of them seemed to be targeted to lowering the costs of manufacture. But the machines to make actual production involving these patents are not something one orders on Amazon and...

Interesting. The problem for me is recurring. Has me wondering if there is another setting in play here. I am not a specialist in butterflies but do like to work on them during our brief Montana summer. Have learned to avoid Eye AF, although I can't say it is picking up patterns on the...

I had troubles with my 100-500 and the R5 today photographing butterflies. AF impossible setting was to ON. Of course, I was using extension tubes which may have contributed to the problem.

I own the 11-24/4 lens. It is great when the subject matter begs for it. But it is huge and heavy and my 16-35/4 gets the most work, especially if carrying it more than a mile is a factor. I think a 2.8 version would be even larger and heavier and might demand a truck both to carry it and...