[toni-a]

Samyang lenses are not AF. So, they can't front/back focus with AF.

What does the focus screen have to do with front/back focus? Totally nothing at all.


That you want to continue to flame just says a lot about you.

To avoid letting this pointless war go further let me answer instead of Obican, BC I have never used any humiliating words and will never do, so no need to use any bad words on me.

Since it's manual focus you can't obviously do autofocus calibration however if your focus screen is not aligned with your sensor then ALL the lenses you use will have focus issues when using manual focus.

In that case you have to calibrate the focus screen to the camera sensor and all your lenses will then focus accurately using manual focus.

I am ready and open for any scientific discussion about the subject as long as it stays within the internet netiquette.