The lens has a slightly rounded 6-blade diaphragm, measures 60mm in diameter and 38mm in length, weighs 194 grams, and takes 49mm filters. This lens is also well known for its 'soap bubble' characteristics, with strong and sometimes harsh outlines, and is seen as swirls on others.
The lens has also enjoyed its moment as a 'cult classic', appreciated for the bokeh effect and its very delightful and pleasant colors as seen on both film and digital.
Though optically identical, with no multi-coating of the older versions, the lens was seen with four iterations over its production run, with the oldest version having silver stripes on the aperture ring branded either “electric” or “auto”.
This was followed by the second version, which has no stripes on the aperture ring but has two silver rings at the front of the lens.
The third version has one silver ring at the front, and the focus ring of the third version has a spiked profile. The last version is all black. A late version with a PB mount is also available.
The lens enjoys a rating for Sharpness (9.0), Aberrations (8.3), Bokeh (10.0), Handling (8.7), and Value (10.0) on PentaxForums.
These first impression images with the Pentacon Auto 50mm f/1.8 were shot with the lens mounted on a Canon EOS 300D. Both the camera and lens are vintage, of course. The M42 mount Pentacon was produced from 1971 to 1978 at the factory outside of Dresden, in Germany.
The Canon EOS 300D (EOS Digital Rebel in the US, EOS Kiss Digital in Japan, and also sold as the DS6041) was the first entry-level digital SLR camera introduced by Canon, Japan, in 2003. The camera is fitted with a 6.3MP APS-C-sized CMOS sensor.
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