Question about Tamron lens

Started Jun 21, 2011 | Discussions thread
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dobeonguard
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Question about Tamron lens
Jun 21, 2011

I have what might be a stupid question, but I will ask anyway. I have the Tamron SP 17-50MM F/2.8 Di II LD Aspherical on my 7D and for the most part I like it. AF in low light can sometimes be hit or miss but other than that its great. I have been contemplating adding a Canon 24-70 L lens to my kit and have been trying to figure out the crop factor in comparison because I want a lens that I will keep on about 90% of the time. The Tamron lens is designed for the APS-C sensor and I believed, maybe mistakenly, that since it is specifically designed for a crop sensor that there is no crop factor. Is this true or have I been dealing with a crop factor all a long? Is it really 27-80mm? I have read conflicting information online about this and just wanted to know. Thanks

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