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09-13-2021, 08:54 AM - 1 Like   #1
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DA*300 stopped focusing

My 300 doesn't get much use, but the focus motor seems to have died since the last time. On both my K-1 and my K-3, i try to focus and...nothing happens. I've used other lenses on both cameras at the same settings, and they work normally. I sprayed contact cleaner on the rear contacts, but it didn't help. Neither back button focus or shutter button focus does anything at all.

I'm getting ready to take a weeklong trip where this lens would be useful, photographing Oregon coastal scenery. I suppose I could use it in MF with focus confirmation. Following that, what? Precision Camera wants $433 to look at it, by their typical half-the-new-price strategy. Or I see elsewhere that Uncle Vanya, bless his heart, will convert it to screwdrive.

Has anybody experienced this- or better yet, found a quick, hidden fix?

09-13-2021, 09:31 AM   #2
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It's a relatively straight-forward process if you're interested in attempting it yourself.
I made a video about the process here:

In the video I mention some tips people use to 'wake up' their lens.
Some abrupt manual focusing back n forth, and maybe percussive maintenance :P
09-13-2021, 10:21 AM - 1 Like   #3
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Do you have an older camera? The conversion isnít too hard. If you can find anyone with a k100d it will take only a few minutes. K10d k100d super and many other cameras work also but I find the k100d to be the easiest since it is able to go into debug very easily.
09-13-2021, 05:13 PM - 1 Like   #4
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I obtained my DA-300 already converted to screw drive, and quite frankly if someone offered to fix the SDM for free, I wouldn’t bother.

Convert to screw drive, and don’t look back…


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