Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-26-2014, 01:52 AM   #1
Loyal Site Supporter
Loyal Site Supporter
i_trax's Avatar

Join Date: Jan 2011
Location: Perth Western Australia
Photos: Gallery | Albums
Posts: 1,119
overheating Sigma DC 18-250 3.5-6.3 Macro HSM in Singapore

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
View Picture EXIF
PENTAX K-3  Photo 

Last edited by i_trax; 05-26-2014 at 01:57 AM.
05-26-2014, 02:08 AM   #2
hcc
Pentaxian
hcc's Avatar

Join Date: Nov 2009
Location: Brisbane, Australia
Photos: Gallery | Albums
Posts: 3,533
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, 03:00 AM   #3
Loyal Site Supporter
Loyal Site Supporter
i_trax's Avatar

Join Date: Jan 2011
Location: Perth Western Australia
Photos: Gallery | Albums
Posts: 1,119
Original Poster
QuoteOriginally posted by hcc Quote
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
Pentaxian
calsan's Avatar

Join Date: Nov 2008
Location: Perth, Australia
Photos: Gallery
Posts: 1,387
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
Loyal Site Supporter
Loyal Site Supporter
i_trax's Avatar

Join Date: Jan 2011
Location: Perth Western Australia
Photos: Gallery | Albums
Posts: 1,119
Original Poster
QuoteOriginally posted by calsan Quote
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
Veteran Member




Join Date: Jul 2009
Location: London
Posts: 889
Overheating - from the sun? excessive use?
05-26-2014, 04:32 AM   #7
Loyal Site Supporter
Loyal Site Supporter
i_trax's Avatar

Join Date: Jan 2011
Location: Perth Western Australia
Photos: Gallery | Albums
Posts: 1,119
Original Poster
QuoteOriginally posted by JohnX Quote
Overheating - from the sun? excessive use?
i think from the sun and very high humidity
05-26-2014, 04:50 AM   #8
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,752
I bet thats the hood!

05-26-2014, 04:53 AM   #9
Loyal Site Supporter
Loyal Site Supporter
i_trax's Avatar

Join Date: Jan 2011
Location: Perth Western Australia
Photos: Gallery | Albums
Posts: 1,119
Original Poster
QuoteOriginally posted by carrrlangas Quote
I bet thats the hood!
it is definitely not
05-26-2014, 04:53 AM   #10
PJ1
Site Supporter
Site Supporter
PJ1's Avatar

Join Date: Jul 2012
Location: Mosquito Creek, Australia
Photos: Gallery
Posts: 1,541
It looks more like something physical. I would have thought lens hood (having done something similar once).
05-26-2014, 05:10 AM   #11
Veteran Member
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,441
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, 05:26 AM   #12
Pentaxian
carrrlangas's Avatar

Join Date: Mar 2012
Location: Joensuu (Finland)
Photos: Gallery
Posts: 1,752
QuoteOriginally posted by i_trax Quote
it is definitely not
Come one... Itīs not big deal...
Tilted hood example from mua:
Attached Images
 
05-26-2014, 05:35 AM - 1 Like   #13
Site Supporter
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,306
Sure looks like a tilted hood.
Here is one with DA*16-50 and hood turned 45 degrees.

Last edited by Ex Finn.; 11-11-2014 at 05:43 PM.
05-26-2014, 05:37 AM   #14
Loyal Site Supporter
Loyal Site Supporter
i_trax's Avatar

Join Date: Jan 2011
Location: Perth Western Australia
Photos: Gallery | Albums
Posts: 1,119
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
Veteran Member
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,441
Remember to use the exact settings when it comes to aperture, focal length and focus distance or you will get a different result.
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!
18-250, dc, hood, hsm, lens, macro, macro hsm, overheating, pentax help, pictures, shape, sigma, sigma dc, singapore
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma 18-200mm f/3.5-6.3 DC Macro HSM bunkachunk Ask B&H Photo! 2 05-21-2014 09:34 AM
For Sale - Sold: AS NEW: Sigma (Pentax) 18-250mm f/3.5-6.3 DC OS HSM lens jm107 Sold Items 2 11-29-2013 03:30 AM
Sigma 18-250mm f/3.5-6.3 DC Macro HSM - $280 TropicalMonkey Pentax Price Watch 6 11-04-2013 08:08 PM
Sigma 18-250 mm f/3.5-6.3 DC Macro HSM Lens Vantage-Point Pentax Price Watch 1 02-01-2013 08:30 AM
Sigma 18-250 f3.5-6.3 DC OS HSM- Opinions wanted logjam Pentax SLR Lens Discussion 2 12-26-2012 04:42 PM



All times are GMT -7. The time now is 03:15 AM. | See also: NikonForums.com, CanonForums.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