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issue of "Popular Photography" I thought I'd dig my old Tamron 500/8 mirror lens The lenses compared were a Canon EF500/4.5L USM and a Tamron 500/8 Re: Tamron lens - which digital? Pentax IST*D or IST*Ds.. I have the Pentax IST*Ds (Digital SLR) and purchased an old Tamron 70-210 lens with an K/A .
The Tamron 20-40mm lens is a part of Tamron's SP series of lenses, the worth of the Tamron lens and thinking of the old adage, you get what you pay for. .
Many (OK, many, many) years ago I had a six week old Tamron lens literally come apart in my hands. The dealer was gracious enough to immediately replace it Some manufacturers like pentax developed an adapter for older lenses, if I was going to go Canon then I'd get Tamron lenses from KEH.com (secondhand).
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