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

Started 10 months ago | Discussions thread
xpatUSA
xpatUSA Forum Pro • Posts: 23,017
Re: 8-16mm HSM focal range is weird, calibrate?
1

spiffariffic wrote:

Hey folks. I got a used copy of the 8-16mm HSM for my SD1M from B&H.

Something is funky with the focus…

AF claims objects 6-8" away ...

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

https://www.imaging-resource.com/lenses/sigma/8-16mm-f4.5-5.6-dc-hsm/specifications/

... are at 0.8m and everything else is at the infinity mark or beyond. The same situation when manual focus, most of the focal range is at or beyond the infinity marker.

What focal length? What aperture?

I wouldn't care what the distant gauge said except that I'm also getting really inconsistent results.

Is this a lens that I can calibrate?

The lens can not be "calibrated". The SD1 can.

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.

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what you got is not what you saw ...

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