A moderate wide angle to moderate telephoto zoom lens with above average optical performance. This lens features continuous focusing (CF) into macro mode with 1:4 macro magnification at the 135mm setting. Maximum aperture varies from F/3.5 at 35mm to F/4.2 at 135mm. The floating element optical design and mechanical construction is somewhat similar to Tamron's SP 28-135 model 28A with the exception of the macro mechanism. Introduced in 1982, this lens was replaced in 1985 with the less expensive and more compact model 40A lens which features a new optical design requiring less complex mechanical construction. The later model 40A lens discarded this model's CF macro ability and instead uses a macro button and macro helicoid, similar to the SP 28-135, to enter the macro mode at the 35mm setting. Both lenses have above average optical performance.
Description
Great working condition, shows normal wear, comes with case, both caps, Adaptall mount for Pentax "K".
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