Nikon AF Fine Tune

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polochick

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Name
Liz
Edit My Images
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Hiya,
Anyone have any experience with this? Just taken shots of a newspaper outside on a cloudy day, at f2.8 (f4 with the 1.4x, 450mm) and 300mm, ISO 200 (which is my most used length/aperture, with my normal sports settings) from -20 to +20 (-20,-18,-16....) to try to make my 120-300 siggy sharper.
Possibly because I'm wearing glasses and not contacts, and having stayed out too late last night, I'm having real trouble distinguishing between the shots. If anyone can lend a pair of eyes I'd be very grateful.
Thanks,
Liz

Below are 100% crops, the first 4 are the 120-300 by itself, the next 3 with the 1.4.

120-300 -4
-4 _DSC8608.jpg



120-300 -2
-2 _DSC8609.jpg



120-300 0
+0 _DSC8610.jpg



120-300 +2
+2 _DSC8611.jpg

 
I'm thinking -2 for the 120-300 and -15 for the tc.. anyone anything else?
Thanks again in advance,
Liz
 
If you crop accurately and to the same size and quality you can simply check the file size! Should be simple enough given this kind of test really should be done from a tripod.
 
Sadly having just returned from travels, tripod is in storage (unreachable before this weekend, when I need the lens) and the closest I had was a pile of books with the camera resting on that and the lens grip.
How is the file size affected by the focussing?
 
polochick said:
Sadly having just returned from travels, tripod is in storage (unreachable before this weekend, when I need the lens) and the closest I had was a pile of books with the camera resting on that and the lens grip.
How is the file size affected by the focussing?
Click to expand...

The more detail there is in the image (technically speaking, the more spatial-frequency content) the higher the filesize will be for formats like JPEG. I'll try not to get too technical on you here, because to answer your question fully will make you :bonk:

Save as the highest quality JPEG you can.
 
Hope it works (should in theory...). Seems like the quickest and simplest way to get an objective number rather than a subjective bit of hand waving ;)

Pragmatically, none of your images above look terrible, so if in doubt I'd leave it be until you can get the tripod out and do a proper job.
 
Woo we have a winner. The scientist in me says it's statistically insignificant, (739.7kb vs 735.0 vs 733.9), but by 0.5%, -15 wins.
Thanks a lot for your help.
 
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