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rkboid · 09-28-2011, 07:12 PM

The exif has the correct focal length, but wrong lens.

Gimbal · 09-29-2011, 03:52 AM

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.

areidjr · 09-29-2011, 04:44 AM

Originally posted by rkboid

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.

Rupert · 09-29-2011, 06:55 AM

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!

areidjr · 09-29-2011, 09:38 AM

Originally posted by Rupert

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.

Rupert · 09-29-2011, 10:15 AM

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!

Gimbal · 09-29-2011, 10:55 AM

It's pretty easy to see if SR works or not with live view...

rkboid · 09-29-2011, 11:48 AM

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.

George Lama · 09-29-2011, 08:57 PM

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.

rkboid · 09-29-2011, 10:08 PM

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?

George Lama · 09-30-2011, 08:34 PM

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?

rkboid · 09-30-2011, 10:05 PM

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.

abacus07 · 10-01-2011, 04:30 AM

Originally posted by areidjr

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?

George Lama · 10-01-2011, 09:51 PM

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.

Smeggypants · 10-02-2011, 02:00 PM

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?

09-29-2011, 04:44 AM	#18
areidjr Veteran Member Join Date: Sep 2007 Location: Pittsburgh, Pa, USA Photos: Gallery Posts: 529	Originally posted by rkboid 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, 10:08 PM	#25
rkboid 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, 10:05 PM	#27
rkboid 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.

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09-28-2011, 07:12 PM	#16
rkboid 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
Gimbal Pentaxian Join Date: Apr 2007 Location: Sweden Posts: 2,106	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, 06:55 AM	#19
Rupert Veteran Member Join Date: Sep 2006 Location: Texas Photos: Gallery \| Albums Posts: 25,123	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
areidjr Veteran Member Join Date: Sep 2007 Location: Pittsburgh, Pa, USA Photos: Gallery Posts: 529	Originally posted by Rupert 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
Rupert Veteran Member Join Date: Sep 2006 Location: Texas Photos: Gallery \| Albums Posts: 25,123	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
Gimbal Pentaxian Join Date: Apr 2007 Location: Sweden Posts: 2,106	It's pretty easy to see if SR works or not with live view...

09-29-2011, 11:48 AM	#23
rkboid 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
George Lama 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.

09-30-2011, 08:34 PM	#26
George Lama 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?

10-01-2011, 04:30 AM	#28
abacus07 Veteran Member Join Date: Oct 2010 Location: Taiwan Photos: Gallery \| Albums Posts: 1,075	Originally posted by areidjr 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
George Lama 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
Smeggypants Veteran Member 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?

A little advice? SR working?

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