Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
09-28-2011, 07:12 PM   #16
Forum Member




Join Date: Jan 2007
Location: Del Rio, TX
Photos: Gallery | Albums
Posts: 62
Original Poster
The exif has the correct focal length, but wrong lens.

09-29-2011, 03:52 AM   #17
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 1,887
That looks a bit weird, it's shouldn't be worse, at least not that much.
My own experience is that SR is effective down to about 1/20, below that it doesn't do much good IMO. 1/10 of a second is just to long...

But when I did my long handheld exposure test I did get some similarly weird results now and then, not often enough to draw any real conclusions though.
09-29-2011, 04:44 AM   #18
Veteran Member




Join Date: Sep 2007
Location: Pittsburgh, Pa, USA
Photos: Gallery
Posts: 529
QuoteOriginally posted by rkboid Quote
EX Finn - Correct - Even though it is showing the correct focal length (55mm) in lightroom it is saying the lens is the sigma 70-200 (I am using the sigma 24-70). Is there something I can do to manually change that?
Does the lens have OS? If so make sure that both the camera SR and lens OS are not both on at the same time.

Last edited by areidjr; 09-29-2011 at 09:35 AM.
09-29-2011, 06:55 AM   #19
Loyal Site Supporter




Join Date: Sep 2006
Location: Texas
Photos: Gallery | Albums
Posts: 23,773
Does sound like a lens identification problem to me? I also not that on my Sigma 17-70 HSM OS lens, if I have on both SR and OS the results are always very bad...not as bad as your shot posted, but still very bad.
On my Bigma, it seems the most impressive results of SR are at the long 500mm range, not at shorter ranges. Of course, I shoot mostly at the longer range, so I see more photos from that result, but I am quite satisfied with the SR...in particular if I turn it off and compare......where it quickly shows how well SR performs.
Regards!

09-29-2011, 09:38 AM   #20
Veteran Member




Join Date: Sep 2007
Location: Pittsburgh, Pa, USA
Photos: Gallery
Posts: 529
QuoteOriginally posted by Rupert Quote
Does sound like a lens identification problem to me?
I doubt that is the problem. The lens is reporting the correct FL (I believe that was stated) so the SR should be able to perform properly. I have several Sigma lenses that use the same ID and have never experienced any problems with SR.
09-29-2011, 10:15 AM   #21
Loyal Site Supporter




Join Date: Sep 2006
Location: Texas
Photos: Gallery | Albums
Posts: 23,773
Well, as a last resort, it could possibly be a defect in the SR. This sort of thing is unheard of in the K5, no doubt about it, but I guess anything is possible?
Try a different lens and if no better...just send it back for another one......heck, what are the chances of getting two in a row with a problem? Right Al?

Regards!
09-29-2011, 10:55 AM   #22
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 1,887
It's pretty easy to see if SR works or not with live view...
09-29-2011, 11:48 AM   #23
Forum Member




Join Date: Jan 2007
Location: Del Rio, TX
Photos: Gallery | Albums
Posts: 62
Original Poster
as stated earlier- It is a problem with the lens and Sigma is aware of the problem. I have found some that said there lenses were updated, but there is no official fix yet according to the person I spoke with at sigma.

PS I received the 16-45 today and played with it for about 20 minutes. All was good.

09-29-2011, 08:57 PM   #24
Veteran Member




Join Date: Jun 2007
Location: Buffalo/Rochester, NY
Photos: Albums
Posts: 1,133
I'm a bit confused. Is the implication that SR or the lens caused what you show on the sample photo?

I set my K5 at 1/10, F4, ISO 1600, and took some photos with my Sigma 24-70 EX DG HSM. My office is very dark, lit only with a 60W CFL on a tabletop (prefer to work on photos this way), so I went even lower, to 1/5 and can still take a half-decent photo, handheld, with SR on.

I have never seen SR do anything this drastic so therein lies my confusion.The only way I can replicate what you show in your photo is by drastically tipping the camera up as I activate the shutter.
09-29-2011, 10:08 PM   #25
Forum Member




Join Date: Jan 2007
Location: Del Rio, TX
Photos: Gallery | Albums
Posts: 62
Original Poster
It is a lens problem according to sigma. The thing that is not making the sense right now is that there are working lenses (such as yours) out there. There have also been people who have taken their lens in and had them updated. On the phone however today Sigma told me it a known problem but that they are working on fix. I really want to keep this copy because it is sharp at 2.8 with no micro adjustments.


PS do you mind sharing your serial number? and did you buy it new?

Last edited by rkboid; 09-29-2011 at 10:14 PM.
09-30-2011, 08:34 PM   #26
Veteran Member




Join Date: Jun 2007
Location: Buffalo/Rochester, NY
Photos: Albums
Posts: 1,133
Don't get me wrong - my lens is far from perfect. My K5 adjustment for this lens is -10 and it's still not there. I'm sending it in to Sigma for calibration, and hopefully for rechipping (or whatever they do) to address the other issues reported.

My lens was bought new, along with the Sigma 70-200 (non OS). Both in fact need the same adjustment. Lens serial is 1014####.

One more question - did you take this in Live View mode or through the view finder?
09-30-2011, 10:05 PM   #27
Forum Member




Join Date: Jan 2007
Location: Del Rio, TX
Photos: Gallery | Albums
Posts: 62
Original Poster
It was not taken in live view. In fact mine will not focaus at all it live view. Good Luck with yours.

This is why I am hesitant to try a new lens - Straight from camera - Made no adjustments to raw - just resized and cropped - 100% crop at F 2.8 - 0 focus adjustment.

Last edited by rkboid; 03-31-2012 at 09:43 PM.
10-01-2011, 04:30 AM   #28
Veteran Member




Join Date: Oct 2010
Location: Taiwan
Photos: Gallery | Albums
Posts: 1,073
QuoteOriginally posted by areidjr Quote
Does the lens have OS? If so make sure that both the camera SR and lens OS are not both on at the same time.
Was this verified as not the cause?
10-01-2011, 09:51 PM   #29
Veteran Member




Join Date: Jun 2007
Location: Buffalo/Rochester, NY
Photos: Albums
Posts: 1,133
That lens has no OS.

rkboid - this photo is likely proof that your camera is front focusing with this lens. This is what I get, even at higher apertures. I verified this with various focusing targets and even spent an hour trying to get this and my 70-200 to get close to focusing properly. I couldn't do it because even at -10 AF adjustment, it wasn't enough.

So I'm sending both my Sigma lenses to Sigma to calibrate to one of my cameras, hopefully in November.
10-02-2011, 02:00 PM   #30
Veteran Member
Smeggypants's Avatar

Join Date: Sep 2010
Posts: 1,536
Does anyone know the actual process they use to calibrate the lens?? I know thelenscan make a difference but the camer ahas control of the lens's focus barrel andsurely is the device that determines when it thinks focus is achieved?
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, k-5, k-5 ii, k-5 iis, k5, pentax k-5, sr
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Macro I'm Working! eaglem Post Your Photos! 3 05-21-2010 07:37 AM
K-X sr working? bullwhip Pentax DSLR Discussion 6 01-20-2010 12:44 AM
How to tell if SR is working? slow2focus Troubleshooting and Beginner Help 14 12-21-2009 09:49 PM
survey: batteries working/not working with the K-x noou Pentax DSLR Discussion 25 12-03-2009 02:43 PM
Advice Columnist Advice on Photography - do you agree? betsypdx General Talk 9 06-24-2007 12:45 PM



All times are GMT -7. The time now is 03:12 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top