What Bruce said. Forty years ago I could manual focus any lens, every time. I 
could even pull focus on a car moving toward me. But eyes wear out faster than 
old manual lenses. I had a heck of a time focusing the 400 yesterday, 
particularly when working from my knees with the camera on a low tripod. Manual 
focus is largely in my past. 
Paul

On Sep 26, 2012, at 8:39 PM, Bruce Walker <bruce.wal...@gmail.com> wrote:

> Nothing tricky to go wrong? Yes there is: the gel-filled lenses in
> your head. That's part of my issue and why I don't do much successful
> manual focussing. I'd be in trouble without AF.
> 
> 
> On Wed, Sep 26, 2012 at 8:35 PM, J.C. O'Connell <hifis...@gate.net> wrote:
>> This is one of the reasons I like my prime SMCK MF lenses.
>> Nothing tricky to go wrong, still going strong after 35 yrs.
>> Sorry to hear your having problems with your newish lens...
>> -----------------
>> J.C.O'Connell
>> hifis...@gate.net
>> -----------------
>> 
>> -----Original Message-----
>> From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of Paul
>> Stenquist
>> Sent: Wednesday, September 26, 2012 8:30 PM
>> To: Pentax-Discuss Mail List
>> Subject: DA* 60-250 to C.R.I.S.
>> 
>> The SDM motor of my workhorse lens seems to have failed after what must be
>> about 20,000 frames. Not too bad, although I guess it shouldn't ever fail on
>> an expensive lens that is marketed as a premium product. A few weeks back I
>> started getting intermittent focus failures. Unmounting the lens and turning
>> the focus barrel manually would wake it up again. I had a couple
>> assignments, so I held onto it, figuring I'd send it out when the weather
>> started to get bad. But at yesterday's shoot it failed completely. Couldn't
>> get a shot off. That was inconvenient as hell, since I didn't have another
>> lens between 135 and 400, and the Mopar Action editor likes the look I get
>> in the 200 to 250 range. But I made do with the 50-135 and the A 400. That
>> 400 is getting harder to focus as my eyes age, so I shot numerous frames of
>> each shot, refocusing after every couple. Should have hung onto the DA
>> 50-200 as a spare, but I sold it to help cover the cost of the DA* lens.
>> 
>> In any case, I hope C.R.I.S. has the part. Don't want to go through the kind
>> of ordeal that accompanied my K-5 repair in July.
>> 
>> Paul
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> 
> 
> -- 
> -bmw
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