What is the issue? Does it just lock up, does it lock up after the shot is taken, does it power up at all? Have you tried with a fresh battery?
I had a problem with an old Sigma lens not working on newer EOS bodies - but that's the other way around, and I guess the underlying causes may be entirely different. I did end up fixing it with a workaround I found online, but this workaround is very specifically for fixing an aperture command incompatibility issue. I'm not sure if this applies in any way to the problems discussed here.
I have Sigma superwide 24 mm that works on Canon 650 , 600, eos 5/A2 but doesn't
close the f stops on Canon 33 and can be used just wide open .
So, I recently acquired a Canon EOS 1N and was thrilled to discover that despite being manufactured in 1994, it's compatible with both my Tamron 24-70mm 2.8 SP VC G1 and Tamron 70-200mm 2.8 SP VC G2 lenses. However, to my dismay, it doesn't work with my first-generation Godox wireless trigger. After wasting seven exposures, I realized none of the strobes were firing. D'oh! The only EOS film camera in my collection that functions seamlessly with all Tamron lenses and the Godox wireless trigger is the Canon EOS 300X from 2004.
Welcome to Photrio!
The Tamron 150mm to 600mm AF VC lens is compatible with the Nikon AF lenses and auto focuses but with its Tamron 2X it will not focus automatically. I confirmed that with Tamron that the 2X extender will not auto focus with ANY Nikon AF film cameras, but are completely compatible with the Nikon Z mirrorless cameras. I just confirmed that with the Nikon Z7ii last week. This sounds like the compatibility problems you are experiencing with the Canon line.
Welcome to Photrio!
The Tamron 150mm to 600mm AF VC lens is compatible with the Nikon AF lenses and auto focuses but with its Tamron 2X it will not focus automatically. I confirmed that with Tamron that the 2X extender will not auto focus with ANY Nikon AF film cameras, but are completely compatible with the Nikon Z mirrorless cameras. I just confirmed that with the Nikon Z7ii last week. This sounds like the compatibility problems you are experiencing with the Canon line.
I am not sure why you are talking about Nikon Z mirrorless cameras here. Of course, all the third-party modern lenses will work with new mirrorless cameras.
The topic is the incomplete combatibility of Tamron lenses with film cameras.
I don't understand what that particular Tamron lens brings to the table vs the Canon EF 35mm f2 i.s.? Yes, the Tamron is f1.8, but 1.8 vs f2 for all of the complications?
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