K-01: Samyang 85mm f/1.4 or Tamron Adaptall-2 90mm f/2.5?

Started Feb 12, 2013 | Discussions thread
Nicols Contributing Member • Posts: 789
Re: K-01: Samyang 85mm f/1.4 or Tamron Adaptall-2 90mm f/2.5?

I've had a number of the various incarnations of the Tamron SP 90mm Macro AD-2 (at least 7 copies). So far none have had the purple spot? If I may hazard a guess, was it the first generation (model 52B with 49mm filter size)? If so, the front element is right at the end of the lens and a lens hood is advised. On the next generation (model 52BB, 55mm filter size), the front element was recessed a bit more.

I have the 52BB. I have used it a lot, until buying recently a Pentax F 100/2,8. I havn't ever seen a purple spot. Shooting against the sky and increasing contrast a brighter spot appears in the centre of the image, maybe some reflection between some lens and the sensor. In normal photos I have never seen it, so it is not really relevant. It is a great lens, a bit prone to flare when shooting close to the sun, but very good quality for macros and useful for weddings and similar events where you have some distance to people.

I bought the Pentax F macro because the diafragm didn't work well any more (it's translation mecanism disengaged inside the lens; I opened it, and fixed it, but I havn't achieved a precise adjustment of the aperture, and it won't close further then f16). Furthermore, to have direct 1:1 macro is great).

Cheers - Klaus

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