I have had my camera for almost two years now. I have also used a Tamron 70-300 AF Tele-macro lense for about a year. A few days ago I started getting error 99 when using this lens. I believe the problem is the lens but I am not sure. If the lens is used at tis maximum apperture the problem does not occur. I have read about solutions such as cleaning the electrical contacts, taking the camera battery off, taking pictures without a lense on but the problem still pops-up. Anyone with experience with this issue?
Tamron repaired the lens under warranty terms. It worked fine after the repair.
I had the same problem with an older non-canon (I think it was a Tamron as well) tele-photo lens. IT would take some photos, but some would cause an error on the camera. The problem is with the lens and the reason might be it is an older lens and is not 100% compatible for the 300D camera. If it is an older lens, you can try calling Tamron and see if they can rechip it which should make it compatible with the camera. Here is a forum post with someone with the same problem. They had the problem when shooting the sky in broad daylight...the reason they had the problem when doing that might have been because it closed the aperture down small and that is what caused it. Scroll to the bottom and read forest5000's comment. http://www.phototakers.com/forum/archive/err-99-when-taking-pics-of-the-sky-10847.htm
You're probably right about the lens. Tamron lenses have a flexible circuit that drives the aperture blades. The aperture might need to be cleaned or the flex might be worn out. Either case needs a repair shop to correct.
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I have a new Nikon DSLR D3100 and would like to use an old Tamron 80-210mm CF tele macro lens with it, if at all possible. I know certain SLR lenses can be used with DSLRs and I am prepared to experiment with different settings. Do you think this combination will work and can you tell me what adapter I will need to buy?
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