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01-17-2014, 10:06 PM   #1
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Pentax F 300mm on K30

Hi,


I'm new to Pentax, have tried other brands, but never happy.



Just bought a Pentax k30 & set it up to use manual focus old lenses. Also bought a Pentax F 300mm prime lens.
When I went to use it for 1st time today, it started to auto focus ok.
After say 5 min use, it stopped working in AF mode - it wouldn't focus lock onto any target. U press the shutter button, green circle flashes in viewfinder, but it won't focus, shutter button will not depress.


Maybe I dont know how to setup camera?



Lens will work ok in MF mode.


Any help much appreciated, thx

01-18-2014, 03:56 AM   #2
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Suggestions:
- AF/MF clutch switched on the lens?
- cleaned the contacts?
01-18-2014, 09:48 PM   #3
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Focus issue

there is no such switch on the lens?

contacts look ok?
01-19-2014, 04:46 AM   #4
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I don't have the lens but assume the focus ring has a clutch.

01-19-2014, 05:08 AM   #5
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This one? SMC Pentax-F* 300mm F4.5 ED [IF] Reviews - F Prime Lenses - Pentax Lens Reviews & Lens Database

Interpreting the most recent post by bbyl, it has a focus switch.
01-19-2014, 05:10 AM   #6
Zav
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Is it not a a ring that you should pull/push to switch between AF and MF?
01-19-2014, 11:25 PM   #7
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Yes, that is the lens, as in post.

There is no switch whatsoever on lens, just black rubber ring u twist to zoom in manual mode?
01-19-2014, 11:30 PM   #8
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QuoteOriginally posted by Sflysnuka Quote
Yes, that is the lens, as in post.

There is no switch whatsoever on lens, just black rubber ring u twist to zoom in manual mode?
You need to push the ring forward to get AF. If you can see "Auto Focus" on the barrel, then the lens is in AF mode. Pull it back for MF.


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