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Hi, there is  a possibility that the card is full and is having trouble finding write space or the the card is faulty? Ian

The 24-105 does not get rave reviews, usually classified as average. I would not compare it to many L series lens. Please read the reviews,

the canon 50 1.8 sharpens up from about f2.2 or even f2.8.You should not need to go to f8 to get a sharp photo.

Besides portraits I also use mine to photograph the cats at play inside. I used to have a 70-210, very light and very fast for photographing the cats. The 135 f2 on the 5d4 gives excellent results.

my 5D4 has red focus points and they are configurable. If you use servo mode the colour is disabled by default.

Hi, 1/.if you have the lens set to manual 2/. depends on how many focus points you have active 3/. depends on how many focus points lock on to the subject ian

The item that has been overlooked in all the answers except maybe the link, the bokeh is also function of the number of blades in the lens diaphragm. I have both lenses and find the 35 f2 provides ...

How did you achieve f80 and f85, there photo would have been pitch blasck and none of my lenses go beyond about f22?

The comment was about the publicity mainly from the far north of Australia when daylight savings was first implemented, the complaint was that the extra sunlight will cause the curtains to fade ...

You sound like the curtains will bleach with more daylight. Farmers have issues with daylight savings because the cows still come home according to daylight not the clock.

Didn't congress pass legislation making daylight savings permanent and why 4 times a year? Ian

Further to your checking, try resetting the cameras to default, then compare the results.