10-29-2020 12:12 PM
10-29-2020 05:29 PM
What lens are you using? Does this happen with all of your lenses?
10-29-2020 06:09 PM
I'm currently using my 24-70 mm. I don't switch it out that much and haven't since this started, so I'm not sure if it would do it when using my 50 mm or not.
10-30-2020 11:52 AM
What you are asking doesn't make a lot of sense to me. Av mode selects the fastest shutter speed(SS). It doesn't have anything to do with ISO adjusting. Auto ISO does that. What I think you need to do is reset the camera to factory default. Menu, tools, clear all settings and clear all custom setting. Now go outside on a nice day set the Mk IV to Av mode. Choose f8, set the ISO to 200. Use One shot and just the center focus point. Daylight WB. Take some shots. You should see the SS change as you vary your subjects. The ISO remain at 200 and the aperture stay on f8. It should work as expected if it doesn't it needs service.
When you use a semi auto mode like Av it isn't a good idea to also choose Auto ISO. You are letting the camera choose two legs of the exposure triangle usually not a good idea. Some guys like Auto ISO in M mode but is that truly manual when you do? I think not.
Do the simple test.
11-07-2020 11:34 PM
So I fixed the ISO issues by resetting to factory settings. But I'm still having the issue of it not letting me choose my focal points except for the ones only on that one center horizontal line. I've checked all that has been mentioned in this thread and it still isn't letting me. I'm super frustrated! I have no idea what else to try!
11-07-2020 11:37 PM
11-08-2020 08:35 AM
If you have the AF area selection method set to M-fn in your AF menu, then the top panel dial controls horizontal placement and the rear dial controls vertical placement of the AF point. To me that is awkward and I have this set so that the main dial controls area selection and I use the joystick button for actually selecting AF point.
11-08-2020 10:07 AM
I’ve been manually choosing my focal points for over a year now and all of a sudden it will only let me toggle through the points on that one line. It won’t go on the other points no matter what options I try. I’m stumped!
Make sure the [LOCK] switch is not in the locked position. Otherwise, I suggest you contact Canon Support.