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09-09-2014, 07:01 PM   #1
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SR won't activate on 90mm 2.8

Ok, got my 90mm today. Put it on my 645D, switched on SR, first 10 shots perfectly fine and I can hear SR activating/deactivating noise (a slight noise, but i can still hear). Then after about 20 shots, I realized in my playback of images that SR was off. I then looked at the lens, SR is set to ON. Took some more shots, SR just refused to be activated. Turned camera off, on, off, on repeatedly, SR still does not get turned on.

Lens was set to AF mode
Camera is on Single shooting mode and AF-S mode

Anyone has the same issue? Did SR just die on my brand new 90mm after 10 shots?

---------- Post added 09-09-14 at 09:06 PM ----------

Ok, now this is interesting. I turned off and rested my 645D and 90mm on the table to type up this thread. After posting, i turned it back on and guess what, SR is functioning normal again. Tried a few shots and in everyshot it works. Very strange. Camera has firmware 1.31. Anyone else experience something similar?

09-09-2014, 09:58 PM   #2

Join Date: Apr 2013
Location: Brisbane, Australia
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Mine did the same thing and it died eventually after about a week. Pentax distributor in Australia replaced it and no problem since.

One thing to note is that if you have the mirror lockup turned on, SR will not work.
09-09-2014, 11:52 PM   #3
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Yes, I got my first one last April and realized that SR was on all the time . Like I couldnt turn it off at all. And the racket it made was awful. Pentax USA did replace it and the new one has been great. Although I have noticed that when pointing downward past about 30 degrees , the SR doesnt work well and I suspect it smears the photos....but that wasnt your question.......
09-10-2014, 06:29 PM   #4
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Original Poster
Thanks for your responses. I used the lens again today for about 50 shots, not once SR failed. So I feel a bit better. I'll certainly keep the lens. If it does fail, i hope the warranty will cover. It's an amazing sharp lens. Really love it.


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