How do service centers correct front- or back-focus on cameras without user AF microadjustment?
Asked 12/20/2012
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If a camera body does not offer autofocus microadjustment in the user menu, how can a repair shop calibrate a body/lens combination that is front-focusing or back-focusing? Are there internal adjustment methods technicians use for specific models?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
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These cameras have microadjustment capability, just not in a user-accessible way.
The exact method varies by model. Some have a software feature in an advanced (and secret) "debug" menu — the Pentax K10D, for example, had this. Others have physical adjustment screws or similar (like earlier Canon Rebel models). Or, repair centers may simply use shims.
To find the exact answer for a given model, you could either dissect the camera and look, or find the repair manual.
Originally by user1943. Source · Licensed CC BY-SA 4.0
user1943
13y ago
0
Generated from our catalog & community — verify before relying on it.
Service centers can often still calibrate these cameras because the adjustment exists internally even if it is not exposed to the user.
The exact method depends on the camera model. Common approaches include:
- a hidden or service/debug software adjustment menu
- physical mechanical adjustments such as screws
- adding or changing shims during service
So a body without user-accessible AF microadjustment is not necessarily unadjustable. Technicians use model-specific service procedures and tools to set autofocus calibration.
There is no single universal method for every camera. To know exactly how a particular body is adjusted, you would need the service manual or a teardown/repair reference for that model.
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