Playing With Lenses: Blah..: Summatech Zoom P-MC Macro 1:4.5 70-210

Cost: 19.99$ (average market price $20)

Blah... that's the correct term to describe this lens. The lens feels cheap, with a shiny but metal build, poor handling and low image quality.

The lens is hard to focus as the focus peaking feature was not accurate, and the focus zoom was hard to use due to an almost hazy picture in the view finder. The macro feature was not much better then any other non-macro lens.

Image quality was lacking. No contrast or saturation, disappointing bokeh, often a lack of sharpness, to much fading of the image when taking pictures in the slightest direction of the sun all the way up to a point where some Lightroom editing cannot correct it anymore.

Just one of these lenses where you doubt you want to post the review, as for sure this one is going for sale on eBay and you don't want a potential buyer to Google this review... but honesty first, I guess.
Blah!

Lens Specification:
Focal Length: 70-210mm
Maximum Aperture: F4.5
Minimum Aperture: F22
Image Format: 35mm
Lens Mount: PK
Optics: ? elements in ? groups
Blades: 6
Focussing: Manual
Minimum Focus: ??cm
Filter Size: 58mm
Weight: 560g
Length: 128-140mm
Production: 70's or 80's
Serial Number: 831346
Made In: Japan

Company:
From the little information I could find, Summatech was a 70's-80's Denver-based company that sold camera accessories and binoculars. Apparently they also distributed a very limited line of re-branded lenses for various mounts. A quick search on past postings on eBay gave a 200mm Prime, a 28mm Wide Angle... but not more.

P-MC
I was not able to find to much on this, so will just assume that MC stands for Multi Coated, and P possible for Pentax Mount. Note that the term PMC (without the hyphen) was also common used on Panagor lenses.

Adapter:

Lens Turbo II PK - Nex

Cost: $75, used on B&H PhotoVideo, new for $149

The Pentax K Lens to Sony E-Mount Camera Lens Turbo Adapter Mark II from Mitakon allows Pentax K lenses to be mounted on Sony E-Mount APS-C format cameras, increasing the angle of view by 0.726x and the maximum aperture of the lens by 1 f-stop.The four optical elements of the Lens Turbo adapter condense light from the Pentax K full frame lens and project it onto the camera's APS-C sensor allowing the sensor to capture all of the lens' transmitted light, negating the 1.5x crop factor and effectively producing full-frame coverage on non-full-frame sensors. A corresponding increase in the maximum aperture of 1 f-stop makes the lens more effective in low-light situations.

The Mark II version of the Lens Turbo features an improved design to produce sharper images. Its rectangular rear lens rests closer to the camera's sensor improving light transmission and an enhanced lens coating minimizes ghosting and flare. One extra-low dispersion (ED) lens element reduces aberrations for better delineated images. The adapter offers a sturdy metal construction and stainless steel mounts, it attaches to both camera and lens with little play and includes a front and rear protective cap. The Lens Turbo is a manual adapter offering no electronic communication between lens and camera.

Samples: