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Fine tuning your Sigma 150-600 f5.0-f6.3 lens


Grumpy_John Avatar
14 Mar 2020 1:40AM
I have recently ordered a Sigma USB dock and will hopefully receive it Monday or Tuesday next week. I will be using it to update and fine tune my Sigma 17-70mm f/2.8-4 DC OS Macro HSM Contemporary, Sigma 24-105mm f/4.0 DG OS HSM Art and Sigma 150-600mm f5.0-6.3 DG Contemporary lenses.
I am wondering if anyone here has gone to the effort of checking the accuracy of the AF on their 150-600 lens. If so, what did you use as a target/chart, and how did you manage to check AF at the middle and extreme ends i.e 15 metres, 30 metres and infinity. These distances require a lot of room, far beyond what most people have available indoors. My only option seems to be to do these tests outdoors, which opens a whole new set of variables including inconsistent light and the need to break down the setup every time I have to connect the lens to the dock.
Looking for any help or thoughts others can come up with.
TIA
Tianshi_angie Avatar
14 Mar 2020 11:01AM
Amazon here do some testing items for lenses - below is one

273254_1584183710.jpg
DarrenSmithPhotography Avatar
14 Mar 2020 11:12AM
i checked my tamron version of that lens with one of the calibrators, two tripods set to the same height, a long tape measure and just went out to a local field I shoot in regularly, set it up and went for it, made sure it was an overcast but bright day.

I was lucky that it did not need re-calibrating, but that's the way to go about it.

also the calibration scales can also be printed from online too
DarrenSmithPhotography Avatar
14 Mar 2020 11:13AM
also probably best to calibrate it for the common distances you shoot from.....
DerekL Avatar
DerekL 18 228 24 England
14 Mar 2020 2:17PM
This is what I use to calibrate all my lenses.
http://www.squit.co.uk/photo/files/FocusChart.pdf
LenShepherd Avatar
LenShepherd 15 4.7k United Kingdom
14 Mar 2020 8:28PM

Quote:Amazon here do some testing items for lenses - below is one

273254_1584183710.jpg



Most camera instructions contain a caution AF may not work well with subjects consisting of fine detail.

The centre of this usually under £5 fold up target consists of fine detail.

For a reliable accurate result I would consign this type of target to the trash can/
Grumpy_John Avatar
16 Mar 2020 5:38AM
My USB Dock arrived in the mail today, I have already updated the firmware on my 17-70, 24-105 and 150-600. Looks like the perfect time to stay home and check the AF on ALL my lenses. No football, or any other events going on ATM. The wife wants to stay at home for the next couple of weeks at least. No point going to the supermarket as the idiots have picked the shelves dry.
colin beeley Avatar
colin beeley Plus
20 1.2k 10 England
7 Apr 2020 11:38AM
you would find it a lot easier to do your micro adjustments in the camera , you can see real time results .use the dock to change how fast the lens focuses .
LenShepherd Avatar
LenShepherd 15 4.7k United Kingdom
7 Apr 2020 7:45PM

Quote:Amazon here do some testing items for lenses - below is one

273254_1584183710.jpg


It is very cheap - but is it any good?
It is surprising how many recommend a target - without first checking their camera users manual to check if what they are recommend is something their camera maker advises as unlikely to be reliable.
This one as a very fine detail geometric pattern which most DSLR instruction books suggest as not good for focus accuracy.
In addition it is a bit small for checking a 600mm bird size subject.
LenShepherd Avatar
LenShepherd 15 4.7k United Kingdom
7 Apr 2020 7:53PM

Quote:This is what I use to calibrate all my lenses.
http://www.squit.co.uk/photo/files/FocusChart.pdf


Is this one any good either?
If you photograph about half way above the central + to get a continuous black/white target parallel to the short dimension of the frame for an easily accurately continuous edge - you are not centered on the 45 degree ruler.
For auto fine tuning with Nikon DSLR's that have it the recommended target is a continuous black and white edge parallel to the short dimension of the frame.

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