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Am I going crazy or just being OCD? I'm using a Canon 5D mark III and a 50L f1.2. After getting it calibrated correctly in correct conditions
using Reikan Focal, i'm getting inconsistant results from using outer focus points. Mine required a +5MA adjustment which imo, isn't too extreme.
From f1.2 and on up using the center cluster area, subject area i'm focusing on is always sharp and on point. This is using Single AF one shot and
Single Spot AF one shot.
But the biggest issue is when I start using outer focusing points. Both single point and spot AF, AF areas are slightly heavily softer than center point.
It slightly improves once i start shooting at f2.8 and up. I also own a 35L which required +8MA and an 85mm f1.8 that requires -4 MA. Every single focus point
is just as sharp as center point with these two lenses. I don't understand why it's a constant issue with the 50L. My question is that is there something wrong with my lens
or is it just a particular characteristic of this lens?
Here's a small test I did using a tripod and available morning light.
5+MA center point by BryantFC, on Flickr
5+MA outer left point by BryantFC, on Flickr
slightly softer and i'm focusing on the "hydro" this is the furthest outer left point at +5 on my 5d3.
now this is the weird part. if i dial in a +15MA and shoot the same shot, it's sharper in the same area.
15+MA outer left point by BryantFC, on Flickr
this also applies to the furtest outer right point on the 5d3. +5 for the first and then +15 on the second.
5+MA outer right point by BryantFC, on Flickr
15+MA outer right point by BryantFC, on Flickr
I also found that if i switched to just using 15 AF points, it's slightly better. For instance, here's a shot I did yesterday using one of the outer focus points with the 15 AF
points, and although it's not as sharp as usual, something doesn't look right to me..
This is f1.2 focus on eye and outer focus point using 15 AF point.
50L f1.2 by BryantFC, on Flickr
Is the issue my own issue due to user error? Am I expecting too much out of extreme shallow depth of field at wide apertures? I can't say I can blame my 5D3 due to the fact that
I don't have this problem on my other two lenses..
I'd like some strong advice on this since this is my go to portrait lens. It is a pain because I bought the 5d3 for the AF system and to get rid of focus recompose.
If it is a lens issue and it's out of warranty, any idea how much Canon will charge to calibrate it to my 5d3?
Sounds like a good reason for me to sign up for CPS Silver soon..