Sigma 100-400 image sample thread (post yours if you have one)
- Thread starter mikew_RIP
- Start date
Will try for two images in the same post,i have just reset the AF speed to normal,i changed it soon after getting the lens so i dont see it can be the cause but a couple of samples images from today.
First at F6.3
Now F9
Both Raw with the standard ACR sharpening and 25% unsharp mask. it looks like F9 has the edge to me,maybe it was the fast focus that was causing the problem,more checks needed.
First at F6.3
Now F9
Camera
NIKON D500
Focal Length
400mm
Aperture
f/9
Exposure
1/500s
ISO
800
NIKON D500
Focal Length
400mm
Aperture
f/9
Exposure
1/500s
ISO
800
Both Raw with the standard ACR sharpening and 25% unsharp mask. it looks like F9 has the edge to me,maybe it was the fast focus that was causing the problem,more checks needed.
Last edited:
Looks like i may have developed back focus in the camera ,ok i wasnt spot on the front chick but it looks sharper further back,no editing just converted from raw for posting,i would have thought this would have shown up from day one plus stopping down should improve the situation (sort of)
Just thought the first one has had some PP in the sense its a screen grab from view which applys the camera jpeg settings.
Just thought the first one has had some PP in the sense its a screen grab from view which applys the camera jpeg settings.
The problem is most of the time you dont get staggered subjects like that,as ime unhappy anyway i am just setting a focus target up,not going with the dock calibrations at the moment just the in the camera adjustments.
Going back to my old way as this is confusing me,all it wants to do is give -2 and that does not seem right 
Before tuning
After tuning
Rather smugly i ditched my fine tune target when i went mirrorless and now i cant find the same type for free download,i want the test target and a sloping ruler type of thing,will keep looking.
Before tuning
After tuning
Rather smugly i ditched my fine tune target when i went mirrorless and now i cant find the same type for free download,i want the test target and a sloping ruler type of thing,will keep looking.
I recommend this thing. Not free, but almost so, and it works very well since you have both, a vertical focusing target and a 45-degree scale that makes identifying front/back focus easy.
Going back to my old way as this is confusing me,all it wants to do is give -2 and that does not seem right
Before tuning
View attachment 265971
After tuning
View attachment 265972
Rather smugly i ditched my fine tune target when i went mirrorless and now i cant find the same type for free download,i want the test target and a sloping ruler type of thing,will keep looking.
Is this the one?
https://petapixel.com/2013/03/12/gh...tion-tool-for-micro-adjustment-enabled-dslrs/
Thanks thats the one
After looking at this shot ime not going to mess around with fine tune,it was great and something has changed so i will try to borrow a different lens for the weekend to eliminate the body,ok i missed its eye but at these settings and focal length, it should be spot on.
Looks like i have a lens problem,just run through the automatic fine tune as is generally recomended ie 10 shots and record the different values.
I used 3 different targets one for each of the tests the last one was a brick wall in good but not glaring light, tripod mounted stabilizing off, the results are interesting
+3
0
0
-1
0
-7
-6
+1
0
0
I didn't bother taking away the two extreme values and setting an average as i felt it was too inconsistent, instead i borrowed a S/h Tamron 150-600. just need to edit some of them but they are worlds better than i have been getting this past week or two.
I used 3 different targets one for each of the tests the last one was a brick wall in good but not glaring light, tripod mounted stabilizing off, the results are interesting
+3
0
0
-1
0
-7
-6
+1
0
0
I didn't bother taking away the two extreme values and setting an average as i felt it was too inconsistent, instead i borrowed a S/h Tamron 150-600. just need to edit some of them but they are worlds better than i have been getting this past week or two.
Dont know if i have cracked it or not,its too early in the morning here for decent light,i put the test charts away and set the lens at what my gut feeling was,hopefully will get some bird shots later.
Why it suddenly devolved such a large back focus issue i dont know but will give it one more chance before it goes back to Sigma,thats the beauty of a three year warranty.
Why it suddenly devolved such a large back focus issue i dont know but will give it one more chance before it goes back to Sigma,thats the beauty of a three year warranty.
Well i think i have cracked it,somehow a couple of weeks ago the lens developed back focus, the D500 auto af tune was driving me spare so i did itby eye.
This has been processed in fastone as adobe has decided my licence for Elements 15 has expired, licence i dont need one i bought the program.
This has been processed in fastone as adobe has decided my licence for Elements 15 has expired, licence i dont need one i bought the program.
