Pentax Slr & Dslr Lenses | Pentax 135Mm F/2.5 Takumar K-Mount Manual Focus Lens {52}

A Lens Is Considered Telephoto If It Magnifies The Image By A Factor Of About 1.5X. This Is Based On 35Mm Full-Frame Or Digital Full-Frame Sensors. For Example, A 100Mm Lens For Full Frame 35Mm Used On A Digital Camera With A Sensor Size Such As Aps-C Format, Will Become A 150Mm Equivalent To 35Mm Full-Frame. The Smaller The Sensor, The Greater The Ratio Will Be. If This Is Used With 35Mm Or Full-Frame Digital, With A 100Mm Lens, You Will Double The Magnification Of A 50Mm Lens. This Range And 80Mm Range Are Perfect For Portraits, As They Reproduce The Human Face Without Distortion. For Example, Using A 50Mm Or Normal Range Will Make The Face Slightly Larger Than Normal And A 135Mm Lens Would Make The Face More Narrow Than Normal. The Telephoto Range Of Lenses Can Be 85Mm, 135Mm, 180Mm And 200Mm.