Rare Promaster Spectrum 7 1.7X Teleconvert...
Rare and saught after Promaster Spectrum 7 1.7X Teleconverter For Pentax Pz-AF.
Generally better image quality than the Tamron 1.4x Pz-AF MC4 on which the Promaster is based.
MC4 Multicoated for high resolution.
4 elements in 4 groups.
Full AF operatio...