Upload & Sell: On
First, I can attest that the 25-50 4 and 50-135 3.5 make a perfect combination - for well lit photography. They are perhaps not the sharpest lenses out there, but they both have that 3D effect, due, I think to excellent color rendition. Add a 50 1.2 and you have a complete kit.
Second, this tube stuff is killing me! Curtis and Ronny, I don't know how you do it! I got set up with the 135 2 AI-s and the Vivitar 31 tube, got to about 3 feet from the subject - where I could focus "left and right" - but what a chore! The subject, an innocent flower whose species only my wife knows, drifted in and out of focus, possibly due to a vagrant breeze. The focus ring on the 135 is not the most responsive. Finally, what was in focus was but a small part of the flower, which held no interest for the viewer.
In frustration, and I am sure to the horror of members of this forum, I slapped on the 105 2.8VR micro, and had a much easier time of it. However the result was nothing artistic, to be sure.
I think I need to select a subject that is smaller, and spent a lot of time with it. Here is an example of my folly.