overheating Sigma DC 18-250 3.5-6.3 Macro HSM in Singapore

**i_trax** · 05-26-2014, 01:52 AM

i_trax's Album: overheating Sigma DC 18-250 3.5-6.3 Macro HSM in Singapore - PentaxForums.com

I was away in Europe for a while, took plenty of photos with no problems till I arrived in Singapore.
the Sigma Contemporary 17-70 was working as it should but the bigger sister overheated after couple hours walk and ....look at the pictures.
anyone had experienced anything similar, is possibly the lens permanently damaged?

Attached Images

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Last edited by i_trax; 05-26-2014 at 01:57 AM.

hcc · 05-26-2014, 02:08 AM

Sorry to hear about your problem and I would be very interested to know more. This is the first time I hear anything like this. Are you suggesting that the lens' HSM overheated?

Did you try to shoot with the HSM off? Indeed you could use the camera's SR with the lens' HSM off.

Afterwards (ie after cooling down), did the lens work properly again?

**i_trax** · 05-26-2014, 03:00 AM

Originally posted by hcc

Sorry to hear about your problem and I would be very interested to know more. This is the first time I hear anything like this. Are you suggesting that the lens' HSM overheated?

Did you try to shoot with the HSM off? Indeed you could use the camera's SR with the lens' HSM off.

Afterwards (ie after cooling down), did the lens work properly again?

I doubt that it was HSM, all "faulty" photos are in focus and very clear except those blacked areas.
Plus I also had Sigma 17-70 Contemporary with me , it also has HSM and it was fine.
I also noticed that with lens temperature increasing the zoom became more and more sticky.
HSM is a silent focus not SR, you can not turn HSM off, it has not got the screw AF.
My Sigma is the latest one, it has no SR (OS or whatever is called ) build in.
Yes, the lens seems to be fine now.
I did e-mail info and photos to CRKennedy ,Sigma AU distributor, but unfortunately I purchased it from B&H NY in DEC2012 so not sure about warranty.
If I have purchased it in AU it would come with 5 years warranty

calsan · 05-26-2014, 03:08 AM

Is it a petal lens hood? It just looks to me like the lens hood has been bumped around 45 degrees.

**i_trax** · 05-26-2014, 03:18 AM

Originally posted by calsan

Is it a petal lens hood? It just looks to me like the lens hood has been bumped around 45 degrees.

if you were right that would be the most embarrassing thing in my life but fortunately you are not right.
that was the first thing I looked at , the turned hood would be much less visible plus it would be symmetrical.

JohnX · 05-26-2014, 04:13 AM

Overheating - from the sun? excessive use?

**i_trax** · 05-26-2014, 04:32 AM

Originally posted by JohnX

Overheating - from the sun? excessive use?

i think from the sun and very high humidity

carrrlangas · 05-26-2014, 04:50 AM

I bet thats the hood!

**i_trax** · 05-26-2014, 04:53 AM

Originally posted by carrrlangas

I bet thats the hood!

it is definitely not

**PJ1** · 05-26-2014, 04:53 AM

It looks more like something physical. I would have thought lens hood (having done something similar once).

VisualDarkness · 05-26-2014, 05:10 AM

I'm actually pretty sure it's the hood as you can see the perfect symmetry of the black areas in the corners ans the shape of a petal hood. The only other possibility in my eyes would be something like a totally tilted element in a somewhat square holder, but that's highly unlikely and something I've never seen before. Try tilting the hood to see if you can recreat it with the identical settings.

---------- Post added 05-26-14 at 02:14 PM ----------

Just look at this outlining, it's the same shape but not tilted:

APS-C is the Red Crop on a Full Frame Sensor: Guidenet: Galleries: Digital Photography Review

carrrlangas · 05-26-2014, 05:26 AM

Originally posted by i_trax

it is definitely not

Come one... It´s not big deal...
Tilted hood example from mua:

**Ex Finn.** · 05-26-2014, 05:35 AM - **1 Like**

Sure looks like a tilted hood.
Here is one with DA*16-50 and hood turned 45 degrees.

**i_trax** · 05-26-2014, 05:37 AM

no it is not a hood, did lot of tests
will take some photos with dislodged hood tomorrow

VisualDarkness · 05-26-2014, 05:42 AM

Remember to use the exact settings when it comes to aperture, focal length and focus distance or you will get a different result.

05-26-2014, 02:08 AM	#2
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 4,002	Sorry to hear about your problem and I would be very interested to know more. This is the first time I hear anything like this. Are you suggesting that the lens' HSM overheated? Did you try to shoot with the HSM off? Indeed you could use the camera's SR with the lens' HSM off. Afterwards (ie after cooling down), did the lens work properly again? Last edited by hcc; 05-26-2014 at 02:21 AM.

05-26-2014, 05:26 AM	#12
carrrlangas Veteran Member Join Date: Mar 2012 Location: Joensuu (Finland) Photos: Gallery Posts: 1,761	Originally posted by i_trax it is definitely not Come one... It´s not big deal... Tilted hood example from mua: Attached Images

05-26-2014, 05:35 AM - 1 Like	#13
Ex Finn. Site Supporter Join Date: Nov 2007 Location: Southern Maryland. Espoo. Kouvola. Photos: Gallery \| Albums Posts: 7,975	Sure looks like a tilted hood. Here is one with DA16-50 and hood turned 45 degrees. Last edited by Ex Finn.; 11-11-2014 at 05:43 PM.*

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05-26-2014, 03:00 AM	#3
i_trax Loyal Site Supporter Join Date: Jan 2011 Location: Perth Western Australia Photos: Gallery \| Albums Posts: 2,621 Original Poster	Originally posted by hcc Sorry to hear about your problem and I would be very interested to know more. This is the first time I hear anything like this. Are you suggesting that the lens' HSM overheated? Did you try to shoot with the HSM off? Indeed you could use the camera's SR with the lens' HSM off. Afterwards (ie after cooling down), did the lens work properly again? I doubt that it was HSM, all "faulty" photos are in focus and very clear except those blacked areas. Plus I also had Sigma 17-70 Contemporary with me , it also has HSM and it was fine. I also noticed that with lens temperature increasing the zoom became more and more sticky. HSM is a silent focus not SR, you can not turn HSM off, it has not got the screw AF. My Sigma is the latest one, it has no SR (OS or whatever is called ) build in. Yes, the lens seems to be fine now. I did e-mail info and photos to CRKennedy ,Sigma AU distributor, but unfortunately I purchased it from B&H NY in DEC2012 so not sure about warranty. If I have purchased it in AU it would come with 5 years warranty

05-26-2014, 03:08 AM	#4
calsan Pentaxian Join Date: Nov 2008 Location: Perth, Australia Photos: Gallery Posts: 1,548	Is it a petal lens hood? It just looks to me like the lens hood has been bumped around 45 degrees.

05-26-2014, 03:18 AM	#5
i_trax Loyal Site Supporter Join Date: Jan 2011 Location: Perth Western Australia Photos: Gallery \| Albums Posts: 2,621 Original Poster	Originally posted by calsan Is it a petal lens hood? It just looks to me like the lens hood has been bumped around 45 degrees. if you were right that would be the most embarrassing thing in my life but fortunately you are not right. that was the first thing I looked at , the turned hood would be much less visible plus it would be symmetrical.

05-26-2014, 04:13 AM	#6
JohnX Pentaxian Join Date: Jul 2009 Location: London Posts: 1,116	Overheating - from the sun? excessive use?

05-26-2014, 04:32 AM	#7
i_trax Loyal Site Supporter Join Date: Jan 2011 Location: Perth Western Australia Photos: Gallery \| Albums Posts: 2,621 Original Poster	Originally posted by JohnX Overheating - from the sun? excessive use? i think from the sun and very high humidity

05-26-2014, 04:50 AM	#8
carrrlangas Veteran Member Join Date: Mar 2012 Location: Joensuu (Finland) Photos: Gallery Posts: 1,761	I bet thats the hood!

05-26-2014, 04:53 AM	#9
i_trax Loyal Site Supporter Join Date: Jan 2011 Location: Perth Western Australia Photos: Gallery \| Albums Posts: 2,621 Original Poster	Originally posted by carrrlangas I bet thats the hood! it is definitely not

05-26-2014, 04:53 AM	#10
PJ1 Loyal Site Supporter Join Date: Jul 2012 Location: Toowoomba, Australia Photos: Gallery \| Albums Posts: 5,484	It looks more like something physical. I would have thought lens hood (having done something similar once).

05-26-2014, 05:10 AM	#11
VisualDarkness Veteran Member Join Date: Nov 2011 Location: Uppsala, Sweden Photos: Gallery Posts: 4,439	I'm actually pretty sure it's the hood as you can see the perfect symmetry of the black areas in the corners ans the shape of a petal hood. The only other possibility in my eyes would be something like a totally tilted element in a somewhat square holder, but that's highly unlikely and something I've never seen before. Try tilting the hood to see if you can recreat it with the identical settings. ---------- Post added 05-26-14 at 02:14 PM ---------- Just look at this outlining, it's the same shape but not tilted: APS-C is the Red Crop on a Full Frame Sensor: Guidenet: Galleries: Digital Photography Review

05-26-2014, 05:37 AM	#14
i_trax Loyal Site Supporter Join Date: Jan 2011 Location: Perth Western Australia Photos: Gallery \| Albums Posts: 2,621 Original Poster	no it is not a hood, did lot of tests will take some photos with dislodged hood tomorrow

05-26-2014, 05:42 AM	#15
VisualDarkness Veteran Member Join Date: Nov 2011 Location: Uppsala, Sweden Photos: Gallery Posts: 4,439	Remember to use the exact settings when it comes to aperture, focal length and focus distance or you will get a different result.