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Tamron 17-50 on a Pentax K10

Osool 15 64 Scotland
5 Mar 2012 10:15AM
I've just bought a Tarmron 17-50 for my Pentax K10, and am puzzled as to its true focal length? Is it acually 17-50 in 35mm film camera terms, or do I have to allow a crop factor for my camera? If this is the case, as I suspect, what would it be, compared to 35mm?

I hope to add a Tamron 28-300 or 70-300 at some point. Again, what would be the focal length of these lenses be in 35mm?

Thanks for any help offered

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pulsar69 13 1.6k 6 United Kingdom
5 Mar 2012 10:24AM
I beleive it is a x1.5 Apsc type sensor therefore your 17-50 would be approx 25-75mm in 35mm terms ... to calculate the lengths of any of the lenses just x1.5

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