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03-25-2012, 06:07 PM   #1
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Trouble with FA 100-300

I have a SMC Pentax-FA 1:4.5-5.6 100-300mm lens. It doesn't focus to infinity (either autofocus or manually) at anything longer than about 135mm. Any ideas on getting to work? (It does fine from 100-135mm) Thanks,

03-25-2012, 08:19 PM   #2
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Sounds like it might be broken. Unfortunately, getting it fixed would cost more than a new used copy...

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03-25-2012, 09:54 PM   #3
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Is that the same lens as this review: SMC Pentax-FA 100-300mm F4.5-5.6 Reviews - FA Zoom Lenses - Pentax Lens Reviews & Lens Database

It might be cheaper to buy another. I picked up mine off eVilBay for $55.
03-25-2012, 10:14 PM   #4
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I had a similar problem with the FA 50 1.4, it would focus well (both auto and manual) for subjects relatively close, but would stop and not let me focus on infinity. I gave it a good shake and sure enough, there was a screw that must have fallen out and gotten logged in somewhere that prevented it from focusing into infinity. I was able to return it and get a replacement, thankfully, because that stubborn screw kept getting stuck and got to the point where I could not budge the focus ring at all.

Just a suggestion on what the problem may be.

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