| Latest Review Posted | Porst Color Reflex MC Auto 55mm F1.2
Works fine on Pentax MX but may need some work for use on DSLR
I managed to make the Porst work on the dslr....it was previously refusing to stop down as other lenses, due apparently to a paint / coating type they used on the lens mount which in effect stops the electronic pins sensing the lens !
So, I tested it with a very thin (thinnest feeler gauge) piece of metal between lens and mount, over contacts....it worked. That simply meant that the camera needed to sense a metal lens mount not a painted / coated one.
So, this meant all I had to do was remove a very thin layer of the black coating on the lens mount, which I did with 800 grit wet & dry, and some lighter fluid, being very careful not to get 'gunk' down the side of the aperture ring and cleaning often with lighter fluid and Kim wipes. I repeated this operation twice, to be sure.
The quick fix worked perfectly and the lens now stops down perfectly as it should, in Manual mode....since it has no 'P' or 'A' setting anyway.
My preferred fast lens for the Pentax K3II is the SMC M 50mm f1.4, which is good, it's also affordable.
I don't need f1.2, since modern sensors are so good in low light now and focussing an f1.2 on a small dslr screen without split circle is actually very difficult. |
