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09-21-2015, 12:43 PM   #1
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K3 fault symbol

When mounting my Sigma 105mm 1:2.8 DG Macro on my K3 I get a flashing "F" in both displays. Never happened before..have had this lens for a few years. No flashing "f" with Sigma 18-200 or Pentax kit lens, 50-200 zoom or wide angle. User manual doesn't mention flashing "f" I assume it means fault, but don't know how to remedy. Any thoughts?

09-21-2015, 12:46 PM   #2
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Flashing f means it can't read the lens info. It's usually a bad contact if it is an automatic lens.
09-21-2015, 12:47 PM - 1 Like   #3
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The "F--" appears when the body does not detect the "A" contact* on the mount. This happens with lenses lacking the contact (not your lens) or when the aperture ring is off the "A" setting or when there is poor contact between lens contacts and the body or when there is a fault in the lens.

So, check your aperture ring position and if on the "A" position, gently buff the contacts on both lens and body with a microfiber cloth.


Steve

* Third from the mount lock pin in the below diagram


Courtesy B. Dimitrov (http://www.bdimitrov.de/kmp/index.html)

Last edited by stevebrot; 09-21-2015 at 12:53 PM.
09-21-2015, 12:58 PM   #4
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QuoteOriginally posted by TomGoulding Quote
When mounting my Sigma 105mm 1:2.8 DG Macro on my K3 I get a flashing "F" in both displays. Never happened before..have had this lens for a few years. No flashing "f" with Sigma 18-200 or Pentax kit lens, 50-200 zoom or wide angle. User manual doesn't mention flashing "f" I assume it means fault, but don't know how to remedy. Any thoughts?
Set the aperture ring to "A" or if that's already set, try dismounting the lens, cleaning its contacts, and putting it back on.


Adam
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09-21-2015, 02:40 PM   #5
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Hi I have this lens and it is not uncommon for this to occur. Solution is ensure proper contact is made by remounting the lens, resetting the aperture ring or cleaning the contacts. A bit of a nuisance at times. This is the only fault with this otherwise excellent lens
09-22-2015, 06:31 AM   #6
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Fault message

Thanks to all. Turned out the lens ring somehow was moved off the A setting. Once reset all is good. Thanks again for the insightful replies. This is a great forum.
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