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8-16mm HSM focal range is weird, calibrate?

Started 10 months ago | Discussions thread
spiffariffic
OP spiffariffic Regular Member • Posts: 137
Re: 8-16mm HSM focal range is weird, calibrate?

xpatUSA wrote:

Imatest states that the closest focus distance is 24cm / 9.4 in, see:

Indeed, it didn't actually focus, I wasn't actually trying to shoot it, I was trying to see what would finally make the lens go to <0.8m. It definitely wasn't 80% of a meter, was my point.

What focal length? What aperture?

Various. I tried several combinations and little to nothing was ever in focus at all when the distance indicator was set to < 0.8m.

I have taken photos at 8mm @ f/4.5 where I had great DoF and immediately after took another shot 8mm @ f/7.1 with shallow DoF. (See attachments.)

(view full size to see that the second one is blurrier in the distance)

At 8mm f/7.1, hyperfocal distance should be 1.9 feet. That's not how it worked out!

Does this seem like something that calibrating the camera can fix?

Thoughts?

I used to find that lens on an SD1 Merrill quite difficult to establish a precise focusing distance most of the time; especially at 8mm where everything looked in focus through the viewfinder - even with a viewfinder magnifier.

Exactly how I shot quite a few shots before I realized anything was wrong.

But I was originally trusting the autofocus here.

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