Originally Posted by minikin 
Hanimex Tele-Auto 1:2.8 f=135mm
SMC Takumar 1:1.8/55
I have these two. With a M42 to K mount they can be used on a digital body with stop down metering. If you want to do macro, then you will want to use manual focusing anyway.
However, the Hanimex is quite a cheap lens, so don't expect too much from it. It looks well built, but I have always found the results disappointing - there is not the colour or contrast that I get with my CZJ 135/3.5 or (more recently purchased) S-M-C Takumar 135/3.5. The Hanimex 135/2.8 I have has a "macro" setting. Basically, there is an extra focus ring at the front, so when you have it at close focus - 1.5m - you turn the extra ring so that you can, umm, get to about 80cm and get a whopping 1:4.5 "macro" feature (according to the lens markings)! That is not particularly good at all.
The SMC Takumar 55/1.8 is a good lens, fast for a near 50, and sharp even open. It will focus down to 45cm, which gets you quite close and IMO it is a much better option for the sort of "macro" that the Hanimex is designed for. And I have had some excellent portraits with it on digital, it renders skin colours very well.
I have just done a quick test for both lenses at close focus - the Hanimex set at 1:4.5. I get 40% greater magnification with the Hanimex, but the image was horribly soft at f/2.8, ordinary at f5.6 and acceptable at f/8. The Takumar is very sharp at f/1.8, and at f/1.8 it is sharper than the Hanimex at f/8.
Since I do not have enough M42 body caps, I use my Hanimex as a "body cap" to keep the dust out of the Yashica 35mm body that I rarely use.
Richard