Probelms with my sigma f1.4 35mm Art

[413x]

Looking into this some more

looks like i am getting some weird AF issues or im doing my testing wrong

tripod,
remote shutter release
test chart at 45 degrees (or near as i can guess)
f1.4
aperture priority

at infinity i seem to get erratic AF results in that two pictures (including refocus) seem to have very different focal planes

Some are on point,
some are back focused
some are front focus

this would be the sort of problem i am seeing in real life
-some pictures are completely out of focus (most) and some (few) are fine
-and where shutter speed doesnt make a difference

all i can think of is something in the setup cannot handle the lighting?
if this is the case then the lens isnt really appropriate

any advice?

 

[413x]

Well I'm a bit shocked

Got my 70d today and am having zero problems thus far.
Even in dark dingy evening the focal points seem to match the focal plane
There is a little bit of error but nothing like the complete miss that I used to get.

I know the 70d has a new focus system but thought it was mainly beneficial to live view?

 

[413x]

Na, 70d focus system was almost if not as good as the 7d so it's definitely a step up

I was surprised at how quick my 7d2 focus was compared to my 70d. I've struggled to find circumstances where the focus struggles to lock! Even when it's dark and in similar light that my 70d struggled with, the 7d2 has been uber hehe

Gratz on the new purchase that that micro adjust done hehe

I can't believe it. Live view tracking works really well.
I would have got the 7d2 but it's just too much. 70d was 600 and 7d2 was 1100 I think

It obviously wasn't the sigma lens then. I will have to try using it outside before I'm certain.
The increased number of focal points (especially focal zone) is a lovely extra

Bought it on a spur when seeing it at 600 and 60d sales for 400.
And as I said before I do make use of the tilt screen especially for macro

Live view and touch is also very nice function

 

[413x]

I don't really understand the arguments against touch pivot screens.
It's not like you are submerging camera in water.
I know a lot don't like them

I dunno what would have made me want the 7d2 but the pivot would have helped tbh
I have got shots with it I wouldn't have without it (including my favourite ever pic)

From what you say on the 7d2 AF it sure is tempting. Being my first dslr the I didn't really understand the benefit going from 60D to 70D but it's amazing

Iso too. I'd say my 70D at 6400 looks same as my 60D at 800 ish (never let it go above 800 due to noise)

Oh. Main reason for getting it was micro adjust. I think my 120-300mm could do with it too

Might keep 60D for my up coming wedding and stick 17-55mm on it

 

[413x]

Looks like this has front focus issue at most distances. +15 MA seems to do the job

 

[413x]

Was that just with your own manual testing or did you use Focal? Just curious

My Sigma 18-35mm needed the most adjustment at the tele end of 35mm and that was something like +17 but everything else was + or - 6 at the most (with my 100mm and 200-400)

This is just with manual testing as yet. Finished up at +11
Is the only lens I was having a problem with that I questioned to this extent

My 120-300mm I think will definitely need it too but not so drastically (and it matters less at f2.8 when targets are far away vs f1.4 with a target at 1m or 2

100mm doesn't need anything, I know that already

Wide angle it isn't really necessary as rarely use a wide aperture

 

[413x]

I don't really like really small bodies.
My gfs old 400d was too small
I definitely prefer the trade offs you get with a pivot screen

My macro L 100mm was always bang on the mark with focus charts
As said may well be different with new body

That's pretty things dof
I've already put up my thinnest dof pic. That was a nightmare