6

The AF confirmation actually works on a very similar principle to the old focus screen, in that they compare two different optical paths in order to determine exactly how in or out of focus the image is. The exact technique is different, but they accomplish the same end goal. The only difference is a computer is comparing the sides of the circle for you. ...


5

Sorry, I don't have the 5D Mk IV but I expect the 5D Mk III should be similar. Not all AF confirmation chips are created equal. There are 1st gen, 2nd gen, 3rd Gen, and 4th Gen. I think only the 4th generation "EMF" versions work with some of the latest cameras from Canon. My SL1 seems to be an exception as it does work with early generation Non-EMF AF ...


5

With this chip, you will, when you half-press the shutter, get the red dot in the viewfinder and the beeping as confirmation of focus, just as if you used a modern AF lens in manual focus mode. But, if you long for the split screen focussing aid, there are third-party focussing screen replacements you can install in your camera. (just for a quick example: ...


3

Based on discussion in the comments above, where it is experimentally verified that autofocus microadjust can move the automatically-found focus point back and forth from the point identified as in-focus for the manual focus confirmation — I think your theory is right and the adjustment is just applied as an offset to auto-focus. This is somewhat surprising, ...


3

I will just address your first question here - your second question is off-topic. Your camera will already tell you if the image is in focus: a green circle/dot will appear in the bottom left corner of the viewfinder. If you want more precision, you can turn on the rangefinder option in the settings menu that will turn the exposure meter (in P, S, and A ...


2

If you programmed the chip to return the correct maximum aperture of f/6.3, Autofocus on an EOS 6D is disabled, and therefore also AF-Confirm does not work. The AF-Sensors on this camera need at least a maximum Aperture of f/5.6 to work. You can look at this question and it's answer for more detailed information.


2

This is probably opinion-based, but in my personal experience, hands-down, the focus screen is the way to go. I've used AF-confirm chipped adapter rings with manual lenses, and I've also swapped out my 5DMkII's focus screen for the Super-Precision matte focus screen (Eg-s) and swapped out my 50D's focus screen for a KatzEye. In my humble estimation, the ...


2

The 28-80 has everything your D5200 needs to function in manual mode, including focus confirmation. AF-S or AF-I are required for the body to focus the lens, but the parts that determine whether or not the image is in focus don't need it. Lenses like that one tend to have lightweight, low-drag mechanicals that make it easy for the in-body focus motor to ...


1

It sounds like your adapter was developed earlier than the EOS Rebel T4i/650D. The third party makers of such adapters don't license technology from Canon, they reverse engineer it. If Canon starts using a part of their existing protocol that hasn't been used in the past, reverse engineered third party products sometimes don't work with the new devices. This ...


1

I thought it was halfway, but after a little more digging, I think it is a full exposure. Somebody wrote up some notes here that might be of some help. I don't know the answer to the question about the focus adjustment, but based on the way that is worded, I suspect that they wrapped a 5-bit integer in a very strange place, such that: 13 - very back ...


1

On a Nikon, [AF fine-tune] is linked to the lense's s/n in the built in CPU, usually you assign the last 2 digits of the lens (from the CPU) to the newly tuned value. The issue you have with non Nikon lenses (eg Lensbaby, with no CPU) and back focus (which is typical for most Nikon lens/body combo, so go to the minus side) requires a [Default] value ...


1

The procedure should be quite similar to the one for calibrating with autofocus lenses (since the camera still uses the AF sensors for confirming manual focus), the only difference being that you must manually focus the lens during the test when you would otherwise be using autofocus. You need to use the Setup -> AF Fine-Tune menu. First there's a quick-...


1

Since you have tested the lens on a T2i, the problem is mostly with the older body. Get it serviced. I guess, there must be some discrepancies with the lens contacts on the XS body.


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