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01-17-2009, 11:25 PM   #1
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K100D AF not focussing

Hi

I recently acquired a used K100D with 2 Sigma lenses (24-70; 70-300) and these really look new/sparingly used. The friend who sent them from overseas has taken a few snaps which look v.good too.

I tried it today, but the lenses are not focussing. I double checked that the switch is on AF, and even reset all custom selections to default. The focus ring on the lenses release (in MF) and tighten on making the MF/AF switch as would be expected. The lenses just dont focus in AutoProgram or any other mode... the exposure continues and I end up with a blurred image.

Warranty does not exist, and I would think of returning rather than chasing repair, as it would be in another city...

All suggestions welcome.

Thanks in advance.
Sridhar

01-18-2009, 02:37 AM   #2
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QuoteOriginally posted by gibikote Quote
I tried it today, but the lenses are not focussing. I double checked that the switch is on AF, and even reset all custom selections to default.
Not sure whether AF settings such as the following are reset: One can, e.g., set the OK button to enable focus. Pressing the shutter button halfway then won't activate the AF but only pressing the OK button will.

Make sure it is none of this.

QuoteOriginally posted by gibikote Quote
the exposure continues and I end up with a blurred image.
Normally, with AF activated the camera shouldn't take a picture unless it detects something in focus.
Is AF set to AF-S?

You could also try to look at the images of your friend and see whether they were taken with AF or manual focus. The PhotoME program can read the EXIF data of images and lets you know.

Hope that helps.
01-18-2009, 02:59 AM   #3
axl
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reseting the custom functions would have sorted out the OK button issue. I'd fiddle with the switch on the lenses, but go through the custom menu again to see if it's set correctly.
Check following:
AF by halfpress: enable or yes
OK button when shooting: choose whichever you like. Setting these two should sort the problem, and try it with different lenses too.
good luck
BR
01-18-2009, 07:47 AM   #4
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Original Poster
hi ClassA and axl
thanks for the suggestions...
need to re-check the Custom settings & switch on the lenses (wonder where that is... )
hope to be back later tonight/morrow.

-Sridhar

01-18-2009, 10:03 AM   #5
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it was the OK button setting!
(is this really a helpful thing - AF on the OK button? havent used it earlier... need to search through the thread to see how ppl use it).

thanks guys!
01-18-2009, 02:32 PM   #6
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The most important part is the ability to keep SR ready for use with the shutter button half-pressed. Combined with AF-C, OK-AF can be effective for getting faster focus (though with higher risk of defocused images).
01-19-2009, 04:04 AM   #7
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QuoteOriginally posted by gibikote Quote
it was the OK button setting!
Hey, that's a lot better than a broken camera.
Glad we could help.

QuoteOriginally posted by gibikote Quote
is this really a helpful thing - AF on the OK button?
I sometimes use it to decouple focusing from shutter releasing.

In particular when you have to recompose after obtaining focus and want to take several shots (perhaps making slight exposure or other alterations in between) with the same focus, it is nice to not make "half-press" refocus again.

Or when I shoot action and want to separately either obtain new focus or capture the moment.
01-19-2009, 04:07 AM   #8
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hi KjetilH
maybe I am asking these too early (before trying)...

* as a general default is AF-C any way better than AF-S (presently my camera is on AF-S)

* if on OK-AF, SR would probably need to be on all the time (from start up). the button is so placed that it would be impossible to move to on position while framing the shot and thumb on the OK.

Thanks!

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