Sigma Serial Numbers Lens
Sigma issue recall for three popular telephoto zooms
Written by Matt Kimberley Wednesday, 16 June 2010 11:12
Lens manufacturer Sigma has issued a recall of three of its telephoto zoom lenses after discovering autofocus faults that could affect models from certain batches. The three lenses affected are the APO 50-500mm f/4.5-6.3 DG OS HSM, the APO 120-400mm f/4.5-5.6 DG OS HSM and the APO 150-500mm f/5-6.3 DG OS HSM. The number of affected units is likely to be pretty small, but any owners with faulty AF systems will be able to get their lenses fixed free of charge as Sigma try to weed out the 'bad eggs' in the batches. If you're an owner, everything you need to know is here.
PRESS RELEASE
After thorough investigation, we have ascertained that some APO 50-500mm F4.5-6.3 DG OS HSM, APO 120-400mm F4.5-5.6 DG OS HSM and APO 150-500mm F5-6.3 DG OS HSM lenses, produced recently, may have a potential autofocus defect.
This issue could possibly occur in some lenses within the following range of serial numbers:
APO 50-500mm F4.5-6.3 DG OS HSM: Serial numbers between 10633051 and 10972000
APO 120-400mm F4.5-5.6 DG OS HSM: Serial numbers between 10574001 and 10972000
APO 150-500mm F5-6.3 DG OS HSM: Serial numbers between 10674301 and 10972000
This is a limited problem that will not occur in any lenses other than those specifically listed above.
To overcome this issue, we will be offering our customers an inspection and where applicable, a modification service, free of charge. In the case of any autofocus problem becoming apparent on inspection, we will rectify the situation and make every effort to minimise delay and inconvenience.
If you are the owner of one of the above three focal lengths but your serial number is different to those specified above, then you need take no further action. If however you are in possession of one of the lenses with a serial number mentioned above, please contact us on our special helpline 01707 376 795 and we will arrange to collect your lens at no cost to yourself. In the unlikely event that the inspection uncovers a potential problem, your lens will be modified and returned to you absolutely free of charge with the minimum of delay.
We deeply apologise if any inconvenience has been caused to our customers.
For further information, please visit www.sigma-imaging-uk.com/returns, call our helpline on 01707 376 795 or email us at support@sigma-imaging-uk.com This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
www.sigmaphoto.com/news/auto-focusing-issue-affects-limit..
I was just looking at ordering a Sigma 150-500mm now I'm kinda nervous, with my luck it'll be one of the recalled ones and I'll immediately have to send it away for repairs.
I have a Canon EOS 85mm f/1.2 L II lens. I sold it to someone, they claim it was broken and sent it back. I am trying to prove that the lens I sent to them, is not the one they returned.
Now click 'Add' from the menu bar and select 'Channel', then 'More plugins'. You should now see 'Sylenth1' in the list.
From http://regex.info/exif.cgi
My lens has a six digit number XXXXXX. How can I convert 0000020f30 or extract to get the 6 digit serial number?
2 Answers
I tried the Jeffrey's EXIF viewer with three images taken with the same camera (a Canon 50D) and three different lenses. The 'Internal Serial Number' value returned by Jeffrey's EXIF Viewer was the same value for all three images taken with the same camera and three different lenses. Each image was taken with, respectively, a Tamron SP AP 17-50mm f/2.8 XR Di-II, an EF 70-200mm f/2.8 L IS II, and an EF 28-135mm f/3.5-5.6 IS. The two Canon lenses were correctly identified in the 'Lens Model' field (The Tamron was identified as a 'Canon EF 28-70mm f/2.8L or Sigma or Tamron Lens' because many Tamron and Sigma lenses are known to spoof the lens ID for the older EF 28-70mm f/2.8L). This leads me to believe the 'Internal Serial Number' value is a reference to the camera body, not the lens (at least on older Canon bodies that do not differentiate between two different copies of the same lens model for various purposes such as AFMA). Even though the the lens ID immediately precedes the 'Internal Serial Number' value, it may not accurately reflect the serial number of the lens used to create the image. Images taken with my 7D using two different lenses shared the same 'Internal Serial Number' with each other, a different number than the three images taken with three lenses using the 50D shared. Images taken with my 5D mark II have a blank 'Internal Serial Number' value when using Jeffrey's EXIF Viewer.
Many Canon camera bodies have a separate internal serial number that doesn't match the one stamped on the exterior of the camera, at least not when the number in the EXIF is translated using a standard hex to decimal converter. This may also be the case regarding lens ID numbers with bodies that can differentiate between two different copies of the same model lens.
The value for 'Camera Serial Number' in the EXIF maker notes of images taken with my Canon 50D is 5AA411141. Using a standard converter yields a decimal value of 24331227457. Yet the Serial number stamped on the camera body is 1520708485. This number is correctly reported by Digital Photo Professional as the camera's serial number. Irfanview reports the serial number as '1520708485 (5AA411141)'. Hmmm. The HEX number that correlates to the stamped serial number 1520708485 is '5AA42B85'. The first four digits match, but the rest doesn't? This is very interesting, though, because (HEX) 2B85 = (Decimal) 11141! Thus it seems the internal number in the EXIF information is a combination of hex and decimal digits! A four digit hex number (in my case '5AA4') followed by the decimal equivalent of the rest of the hex form of the entire serial number (in my case 11141 which is the decimal equivalent of 2B85)!
The Value for my 7D and 5D II work exactly the same way. If I convert the camera's serial number to Hex, then convert the last four hex digits back to decimal, I get the same value that the maker notes show for the camera serial number: The first four digits of the 8-digit hex number followed by the decimal equivalent of the last four digits of the 8-digit hex number.
Although it doesn't help your situation, the best practice when selling a lens anywhere near the value of an EF 85mm f/1.2 L would be to document the serial number of the lens and the condition it is in before you ship it.
This number looks like a hexadecimal number. If you put it into a convertor such as this one it will give you a decimal number - in this case 134960. The conversion may or may not be as simple as this but this does give a 6 digit number.