Hi there,
I am looking for a budget 135mm lens for shooting flowers and insects to be used with my K3, I've got a nice Jupiter 37A already but it is m42 and no AE, I found it quite slow to use especially in stop down metering, and it is slightly soft to my taste, I want to get rid of m42 with something semi auto like the Pentax-M/A series. I am also looking for the Tamron 135/2.5 that I used long time ago, I found it very sharp and bright, but I never own a Pentax 135 so can't decide between them. AFAIK most Pentax 135 use 5 elements but the Tamron use 4 only but with a thick convex element at the front, and use high refractive glasses to make the lens very compact, so I believe it will work equally well as 5 elements design, if I remember right the Tamron has shorter MOD than the Pentax that suit my needs more, so that I am biase to the Tamron, but still want to know how they compare, any comment ?
Last edited by lotech; 04-21-2021 at 06:01 AM.