I have the Exynos S9+ and I use the camera a lot, especially macro shots in pro mode.
I have noticed that there is a few centimeters difference in the closest distance that the camera can focus between the manual and auto focus.
With the auto focus or 'tap to focus' I can get as close as about 5.5cm
With the manual focus when dragging the slider all the way down I can only get about 9cm (this distance should also be 5.5cm).
I know it doesnt seems much but when taking macro shots 9cm vs 5.5cm is a lot and it makes the manual focus useless for me.
I have tested this with a friends S8 and both its camera's auto and manual focus modes are having a good close focus distance of 5.5cm.
I have also posted this problem on reddit and it seems only the Exynos models are having this issue:
Hopfully someone from samsung can help with this.
Here are some images to show the problem:
It indeed looks like a software bug. the problem is samsung are ignoring it, i guess because not enough peaple are complaining about it.
I reported about this bug with full details through the samsung members app a while ago and the response I got was that its "normal operation" which doesnt explain why the snapdragon s9 variant or the older s8 doesnt have this issue.
Well at least i can help my self out by using 'Pro' Mode, setting everything to manual as i want and then using autofocus if want to shot very near objects. But it's so sad. The camera makes realy brilliant photos and is hold back by poor developed software.