The Tamron 28mm f2.5 lens (model 02B) with the Adaptall-2 mount system is a lens I have owned since 1986. The lens was made in Saitama, Japan by the Tamron Co., LTD.
I purchased it at the time for my Yashica FX-70 35mm camera. I finally decided to give it a try on my Samsung NX1 using a C/Y (Contax/Yashica) to NX adapter (see photo below)
Below are the some specifications I found at AllPhotoLenses.com (click link for additional details on this specific lens:
I went out for a walk around the neighborhood about 1-1/2 hours before sunset. There were thin clouds obscuring the sun at times, but it poked-through for some of these photographs.
All the photographs shown here were "as-taken" JPEG's. There was no post editing with the exception of resizing from the large 23.4 megapixel APS-C sensor resolution. All photographs were handheld and no filters were used, except where noted below the photo with the settings.
Note: I did not record the aperture settings, but I stayed within a range of f5.6 to f11 for this series
Note: It was interesting to find out that this lens had a minimum aperture setting of f32. I want to go back out in full sun and photograph this essentially "pin-hole" setting. I will post these photographs when available.
Additional information links: