Lense Problems!!!

[Gordon]

Hello Ladies & Gents

I have got 1 sigma zoom 28 - 200mm f3.5 - 5.6 & 1 sigma DL zoom 75 - 300mm lenses when I put them on my 350d camera's they work inside my house but when I try to use them outside i get err99 on my camera. I have migrated these lenses over from my film setup.

can you please explain what the problem might be.

Gordon

[dazzajl]

I had a sigma lens from the film days that would do that on a digi eos. It was fine when the aperture was wide open but stopped down at all, all you got was error 99.

As far as I can remember, there are some older sigmas that don't work on digi cameras. :(

[mattyh]

You can send them back to sigma for "rechipping" so they do work with digital, although how much it costs I'm not sure, might not be worth it :shrug:

[hughwi]

http://www.richardsnotes.org/archives/2005/04/29/50mm-lens-contact-points/

have you tried cleaning the contacts?

[andrewc]

Older Sigma lenses will often give ERR99 codes on Canon digital bodies - this is apparently due to Sigma reverse engineering the Canon system and not knowing all the facts.

Sigma can re-chip some lenses, but not all.