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Old Sep 26, 2013, 9:21 AM   #1
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Default calibrate replacement lens compact camera?

I would like to replace my Zeiss Vario Tessar lens from my compact Sony DSC-W100.

One repairservice/shop told me I should not replace it by myself, since after replacement it should be AF-calibrated with special equipment. Sounds reasonable, but other shops or youtube movies never seem to mention it. What's true here? Calibrate? Or simply replace it myself?

Another thing is that lens prices vary a lot: 18 dollar Ebay, 38 - 140 euros repairservice/shops. They all claim it's the original, new, Zeiss... Are there garbage/copies for sale or simply take the cheapest and it's probably ok?

thanks !

Last edited by jazzzz; Sep 26, 2013 at 1:08 PM.
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Old Sep 26, 2013, 1:30 PM   #2
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Once you open the camera to change the lens, you are going to let in dust. It will migrate to the sensor, sooner or later.
ebay lenses may be take-offs from dead cameras.
As to calibration, I can't say for sure, but there is nothing inherent in the contrast detect system to require it. It is more a function of the camera software.

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Old Sep 26, 2013, 7:01 PM   #3
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G'day mate

A few years back I had Fuji Australia replace a lens uint on my 14x zoom of the time - the repair docket that came back mentioned recalibration as well as its warranty replacement

Phil
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Old Sep 30, 2013, 1:13 PM   #4
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Tnx!

The calibration issue is still not clear to me. If necessary at all I do not think it can be a set-screw (how do I call it?) manual exercise. Not even in 2006.

VTphotog: do you mean calibrating the lens by some softwareapp, or that the AF-software of the camera fixes it automatically?
Ozzie_Traveller's lens was supposedly recalibrated, but how?

jasper

ps. The dust comes in anyway, I had to clean lens + CCD...
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Old Sep 30, 2013, 6:06 PM   #5
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G'day Jasper

I would imagine [in today's electronic world] that any calibration would be on a computer-controlled jig of some sort

Haven't thought about it in fine detail before but ...

I would expect that the camera would be stripped to motherboard + lens unit and attached to the testing jig, then a light beam passed thru the lens onto the sensor & the equipment would fine-focus to get it 'right'

Equally, the test jig would have a rainbow-coloured display for colour & brightness calibration of metering & exposure things as well

Maybe others here know more than my random musing
Phil
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Old Sep 30, 2013, 6:34 PM   #6
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Sorry if I wasn't clear. When focusing, the camera software detects where the maximum contrast is. This, in itself, doesn't require calibration of the lens. If the focus distance is included somewhere in the information, then that would have to be calibrated to the lens. Same for zoom position. There may also be mechanical/electrical stops which need to be set. Don't know for sure.
If your camera doesn't work now, you're not likely to make it any worse.

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