SMC Pentax-FA 100mm F2.8 Macro Help
Posted 13/04/2022 - 18:03
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The following assumes that you have checked the lens and mount for obvious signs of damage?
With the lens detached from the body, are you able to rotate the focussing ring?
If you hold the lens with bayonet closet to your body and the barrel markings facing up, you will see that there is a clamp mechanism on the RH side. Check that this is disengaged/off.
If you switch to manual focus on the camera body, are you able to focus with the lens?
Check and clean the contacts on the lens bayonet and camera mount, preferably with a lint-free cloth moistened (barely) with 70% (v/v) isopropyl alcohol (propan-2-ol) or, failing that, an alcohol wipe or Steri-Swab of the kind used to wipe the skin immediately prior to being given an injection. Allow to air-dry fully before re-mounting the lens and testing.
If possible, test the lenses screw-drive AF on another body.
Have you/are you currently experiencing AF problems with your K-3iii and any other lenses in your possession?
These checks should allow you to determine if the problem lies with the lens or the camera body. You would have to be very unlucky for it to be a problem with both.
With the lens detached from the body, are you able to rotate the focussing ring?
If you hold the lens with bayonet closet to your body and the barrel markings facing up, you will see that there is a clamp mechanism on the RH side. Check that this is disengaged/off.
If you switch to manual focus on the camera body, are you able to focus with the lens?
Check and clean the contacts on the lens bayonet and camera mount, preferably with a lint-free cloth moistened (barely) with 70% (v/v) isopropyl alcohol (propan-2-ol) or, failing that, an alcohol wipe or Steri-Swab of the kind used to wipe the skin immediately prior to being given an injection. Allow to air-dry fully before re-mounting the lens and testing.
If possible, test the lenses screw-drive AF on another body.
Have you/are you currently experiencing AF problems with your K-3iii and any other lenses in your possession?
These checks should allow you to determine if the problem lies with the lens or the camera body. You would have to be very unlucky for it to be a problem with both.
Posted 13/04/2022 - 18:38
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Thanks yes there does seem to be a problem with the connection between camera and lens as all my other lens work perfectly il send the lens back thank you for ur help Paul
A question is only easy when you know the answer ..
Posted 13/04/2022 - 20:28
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When I first used my 55-300 on my K3iii at the weekend it wouldn't auto focus, hunting badly, and on Auto and Av set the speed to 1/2000 resulting in dark images. It was ok in manual focus and correctly set the speed. As all other lenses were working fine I guessed it was the lens electrical contacts. Luckily I had a lens wipe with me, dismounted the lens and wiped both body and lens contacts. All ok afterwards, there was some dirt on the lens contact. Never had a problem with the K70 so it may be that the K3iii is more sensitive to dirty lens contacts.
Paul
K1000, Espio 140, ist, istD, K70, K3iii and numerous lenses, just don't tell my wife.
K1000, Espio 140, ist, istD, K70, K3iii and numerous lenses, just don't tell my wife.
Posted 13/04/2022 - 22:56
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Thanks I did clean the contacts on both the lens and camera no difference sadly .Paul
PRYorkshire wrote:
When I first used my 55-300 on my K3iii at the weekend it wouldn't auto focus, hunting badly, and on Auto and Av set the speed to 1/2000 resulting in dark images. It was ok in manual focus and correctly set the speed. As all other lenses were working fine I guessed it was the lens electrical contacts. Luckily I had a lens wipe with me, dismounted the lens and wiped both body and lens contacts. All ok afterwards, there was some dirt on the lens contact. Never had a problem with the K70 so it may be that the K3iii is more sensitive to dirty lens contacts.
When I first used my 55-300 on my K3iii at the weekend it wouldn't auto focus, hunting badly, and on Auto and Av set the speed to 1/2000 resulting in dark images. It was ok in manual focus and correctly set the speed. As all other lenses were working fine I guessed it was the lens electrical contacts. Luckily I had a lens wipe with me, dismounted the lens and wiped both body and lens contacts. All ok afterwards, there was some dirt on the lens contact. Never had a problem with the K70 so it may be that the K3iii is more sensitive to dirty lens contacts.
A question is only easy when you know the answer ..
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