Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-08-2019, 01:37 PM   #1
Pentaxian
edom31's Avatar

Join Date: Nov 2017
Location: Garden City, NY
Photos: Gallery
Posts: 2,350
Thread of shame - Rechipping for Canon Sigma EX 105/2.8

Hello!

This is a sad post I have to make. I just got a Sigma EX 105/2.8 Macro (Non-DG) for Canon EF mount. The lens is clean as a whistle, inside out. A beauty!!!

BUT - the Non-DG version does not do well with "new" canon DSLRs - I have the 450D/XSi which is a 2008 model.

I've seen posts about rechipping lenses or reprogramming lenses. While very handy, I cannot take on this endevour... to which I come to the conclusion and question - is there a go-to-person known to the community (an Eric to the Pentax SLRs) that knows how to rechip these lenses?

I called sigma - they do not service the lens any longer - they stated that the lens is now a "25% cupon" for any lens with focal length across 105mm (prime or zoom) - so if anyone is thinking of buying an Art / S / C Sigma and need a 25% cupon...

All in all, I'd wish to get the lens fixed and usable... I can take shots wide open - (take one and shut down the camera due to the error code), and these shots are really nice...

thanks for any input/

02-08-2019, 01:51 PM   #2
amateur dirt farmer
Loyal Site Supporter
pepperberry farm's Avatar

Join Date: Dec 2014
Location: probably out in a field somewhere...
Photos: Gallery | Albums
Posts: 16,831
buy an 'older' Canon?
02-08-2019, 01:55 PM - 2 Likes   #3
Pentaxian
edom31's Avatar

Join Date: Nov 2017
Location: Garden City, NY
Photos: Gallery
Posts: 2,350
Original Poster
QuoteOriginally posted by pepperberry farm Quote
buy an 'older' Canon?
Great minds think alike

I'm actually researching which Canon DSLRs would take SLR EF lenses... not so clear though. I know the lens would work with a Rebel SLR, but I have too many film 35mm cameras on queue at home that have not even been tested.

Further, wife looking at me already like I'm a crazy cat lady (but replace cat with camera... and lady with guy). I have to factor in that a new rescue "kitten" might not be allowed in the household
02-08-2019, 02:22 PM   #4
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,150
QuoteOriginally posted by edom31 Quote
Hello!

This is a sad post I have to make. I just got a Sigma EX 105/2.8 Macro (Non-DG) for Canon EF mount. The lens is clean as a whistle, inside out. A beauty!!!

BUT - the Non-DG version does not do well with "new" canon DSLRs - I have the 450D/XSi which is a 2008 model.

I've seen posts about rechipping lenses or reprogramming lenses. While very handy, I cannot take on this endevour... to which I come to the conclusion and question - is there a go-to-person known to the community (an Eric to the Pentax SLRs) that knows how to rechip these lenses?

I called sigma - they do not service the lens any longer - they stated that the lens is now a "25% cupon" for any lens with focal length across 105mm (prime or zoom) - so if anyone is thinking of buying an Art / S / C Sigma and need a 25% cupon...

All in all, I'd wish to get the lens fixed and usable... I can take shots wide open - (take one and shut down the camera due to the error code), and these shots are really nice...

thanks for any input/
Someone needs to tell Sigma that 2008 is not a "new" model.
At one time I had a 2007 Canon XT, but it died of processor failure, and I'm on my second Pentax since then.
{am I correct in thinking that "DG" means "digital" in Sigma talk - so this was built for a film camera, like the EOS Elan I purchased in 1995???}

02-08-2019, 04:21 PM   #5
amateur dirt farmer
Loyal Site Supporter
pepperberry farm's Avatar

Join Date: Dec 2014
Location: probably out in a field somewhere...
Photos: Gallery | Albums
Posts: 16,831
QuoteOriginally posted by reh321 Quote
At one time I had a 2007 Canon XT, but it died of processor failure, and I'm on my second Pentax since then.
{am I correct in thinking that "DG" means "digital" in Sigma talk - so this was built for a film camera, like the EOS Elan I purchased in 1995???}

if I remember correctly, 'DG' implies a full-frame lens, while 'DC' denotes a crop-sensor lens.. in Sigma-speak...
02-08-2019, 05:07 PM - 1 Like   #6
Pentaxian
edom31's Avatar

Join Date: Nov 2017
Location: Garden City, NY
Photos: Gallery
Posts: 2,350
Original Poster
QuoteOriginally posted by pepperberry farm Quote
if I remember correctly, 'DG' implies a full-frame lens, while 'DC' denotes a crop-sensor lens.. in Sigma-speak...
You know it.. the issue is likely w Canon mount. Apparently in 2003 or so canon dslrs (after the D60) kept the EOS mount from film as before, but changed their internal mechanisms of AF and lens communication.

When sigma serviced the lenses, they'd reprogram the old stock, but since the plain EX is out of commission since 2004, then it is noblonger serviced.

I saw a thread in these forums about rechippimg for K mount, but I didn't dig deep on that one.

I could technically tapeover the contacts in the lens and use it wide open (without the error code that makes me shut down the camera each time)... but that renders me w a wideopen macro.... Artsy at most, maybe good portrait result. Will try tonite.
02-08-2019, 06:24 PM - 1 Like   #7
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,150
QuoteOriginally posted by edom31 Quote
You know it.. the issue is likely w Canon mount. Apparently in 2003 or so canon dslrs (after the D60) kept the EOS mount from film as before, but changed their internal mechanisms of AF and lens communication.

When sigma serviced the lenses, they'd reprogram the old stock, but since the plain EX is out of commission since 2004, then it is noblonger serviced.
So they did this in a way that their old lenses continued to work correctly, but it broke Sigma's reverse engineering? Sneaky
02-08-2019, 07:19 PM   #8
Pentaxian
edom31's Avatar

Join Date: Nov 2017
Location: Garden City, NY
Photos: Gallery
Posts: 2,350
Original Poster
QuoteOriginally posted by reh321 Quote
So they did this in a way that their old lenses continued to work correctly, but it broke Sigma's reverse engineering? Sneaky
Only a truly capitalist company like them works in these ways (hence why I'm a Pentax-first hobbyist).

From Canon Knowledge Base - Using Non-Canon lenses on a Canon EOS camera. :
Third-party lenses
The makers of third-party accessory lenses are not given this information when Canon introduces new features or improves the performance of its cameras and lenses. It's up to them to continue to "reverse-engineer" their equipment to enable it to continue to work on new EOS bodies as they're developed. Since Canon designs our own processors and all electronics within the body and lens, we have been able to maintain backward compatibility. This is one of the many advantages of choosing a Canon EF lens.When changes in communication result in a third-party lens that now produces errors, it's up to the makers of that lens to update the equipment to work on the EOS camera in question. Again Canon's own EF lenses work without modification.

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!
canon, canon sigma, lens, lenses, non-dg, shots, sigma, thread of shame
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
It's a shame we can't talk about DPreview here... Cambo Photographic Industry and Professionals 46 06-19-2018 02:12 PM
Vivitar S1 105 VS Sigma EX 105 OrenMc Pentax SLR Lens Discussion 12 04-28-2009 08:35 AM
Sigma EX 70 F/2.8 or EX 105 F/2.8 Macro lens?? GLThorne Pentax SLR Lens Discussion 8 03-26-2007 06:39 AM



All times are GMT -7. The time now is 08:11 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