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04-27-2014, 01:46 AM   #1
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K-01 SR failure report (lots of photos)

After back from a short vacation during the Easter holidays, I found some shots taken were unreasonably blurred. I have confidence that my hands are steady enough for those situations. Further studies found that those blurred photos were all shot at 18mm with the 1855 kit lens, at 1/80 or 1/100 sec, while shots at lower/higher speeds were sharp and fine.

With these clues and Google, I came up to this 2010 thread: "Odd Shake Reduction Failure"

My photos have the same symptom! Whole image duplicated and shifted vertically/horizontally (landscape/portrait mode).

I bought the K-01 twin dal kit 1855 & 520 on March 2013. I recalled that some early test shots were not sharp. I didn't trace the problem before because I believed that extreme ends of (cheap) zoom lenses are always so and so, or may be some autofocus error and/or my own hand shaking problem.

Soon I dug from the backup, bingo!

=============================
Here is my bug report of:
Pentax K-01, ver1.03 with 1855 DAL lens, SR failure at 18mm.

* SR failure, "over done" at 18mm range with shutter speeds 1/80~1/125.
* Failure appeared in the short side direction of the apsc format.
* Slightly, not very sure for 20~21mm and 1/60 samples.
* iso and f-no. do not matter.
* The SR failure doesn't show up in other focal length/shutter speed combinations, yet.
* Lenses owned and used without problem: 520 DAL, F3570 red, A721/4, M135/3.5, Chinon 50/1.4, Sigma Apo DG 730.
==============================

Want to know if someone experienced the same problem with other models, lenses and under specific settings. If this is software issue, hope Ricoh fix it in the future firmware update. If this is hardware issue, sadly my 1-year warranty expired. Please advise.

Following are some failure photos with 100% crop. The original jpg files can be found in my google drive for download. Included are also some normal photos taken in the same/similar scenery for comparison. You can distinguish by viewing the shutter speed in the exif.

All photos are shot hand-held, original direct from camera and untouched. I set the camera date wrong in the beginning, so if you see 2012 in the exif, it should be 2013.

_IGP2208, 18mm, 1/100

100% crop


_IGP2210, 18mm, 1/100

100% crop


_IGP2212, 18mm, 1/100

100% crop


_IGP2327, 18mm, 1/80

100% crop



Some early test shots and recent Macau trip:

_IGP0199, 18mm, 1/100, SR + motion bur

100% crop


_IGP0202, 18mm, 1/125

100% crop


_IGP1706, 18mm, 1/80

100% crop



On the positive side, SR really shines when normal.

_IG0133, 18mm iso400 f5.6 1/3.3

100% crop


_IG0146, 18mm iso400 f4 1/6

100% crop


_IG1902, 18mm iso640 f5 1/15

100% crop


_IG1909, 32mm iso640 f5 1/25

100% crop


_IG2201, 47mm iso250 f6.3 1/20

100% crop


_IG2206, 28mm iso250 f5.6 1/25

100% crop


_IG2235, 21mm iso1600 f4 1/6

100% crop


_IG2258, 18mm iso400 f5.6 1/25

100% crop


_IG2341, 55mm iso640 f6.3 1/13

100% crop


Thank you for viewing, please comment.

04-27-2014, 05:51 AM   #2
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I think you posted enough photos (x5). The fact that you are only seeing this issue with one lens and then only at 18mm does not seem to be a clear indicator that there is an issue with the SR system. You may want to do a series of on-tripod shots with SR off at the same/similar lens settings (focal length, aperture, and distance) as the bad photos above. This would be to rule out an issue with your lens.


Steve
04-27-2014, 08:55 AM   #3
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Original Poster
Thanks Steve.

I think that it should be a software problem, not mechanical. As I know the amount of SR depends on the focal length and shutter speed mostly. You mentioned also "distance" which I ignored. My bad samples did cover focus points from about 2-feet, medium to almost infinity. Therefore I guess there are two possibilities of SR failure in my case.
(1) a firmware bug to calculate SR amount for 18mm + 1/80~1/125 range of shutter speed
(2) my 1855 lens sent wrong information to the SR system

But (2) was ruled out since 18mm has no problem at 1/6, 1/15, 1/25, 1/30 etc.

I have just done some quick test indoor (now is night time in Hongkong). It is interesting to know that the SR failure didn't show up in the follow conditions:

(A) SR turned on, manual exposure at 1/80, 1/100 & 1/125 using high iso
(i) use my manual lens Chinon 50/1.4, input focal length 18mm to deceive the SR system : NO SR failure
(ii) use 1855, tested both with manual exposure and Tv mode : NO SR failure

(B) same as (A) but SR turned off: NO SR failure (of course)

The above quick test inspired me to one more factor to consider, all the bad photos were shot at AV mode, this is the mode I used all the time besides manual.

I will test with Tv mode and use of tripod tomorrow.
04-27-2014, 03:42 PM   #4
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The reason I thought it may be the lens is because doubling such as you are seeing may be caused by a misaligned or damaged element. It may only be evident at specific alignments of the internal elements. Another possibility is coffee jitters. I know that sounds silly, but it is possible to overpower the SR with a tremor or involuntary flinch. Now that I have typed that last sentence, I took another look back through your images and the EXIF, especially the "good" images. What I saw gave me a reason to pause.
Have you noticed that the full-resolution (100%) crops of your in-camera JPEGs are heavy with processing artifact?
You have both contrast and sharpness set to hard. When looking at the "doubling" it reminded me a lot of the type of artifact that comes from excessive sharpening coupled with high local contrast. May I suggest that you reset your in-camera JPEG settings to the factory defaults (especially contrast, saturation, and sharpening) and see if that might not resolve your issue.


Steve

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