A lens that could be sold with the Vivitar v3800N and these are still being made if I'm not mistaking.
That SLR is made by Cosina and I would guess that this lens is also that.

Specs:

Focal length: 28-70mm	Weight: 365g
Optical design: 9 elements in 8 groups	Mount: Pentax K (PK) But can also be found with other mounts.
Aperture: f/3.4-4.8 to f/22 6 bladed aperure	Covers: Standard 35mm film size (24×36 mm negative)
Closest Focus: About 0.35m (1.1ft)	Filter Size: 52mm (rotating)

Image quality


Build quality

Bit of a mixed bag.
I is mostly made of metal with an exception of the aperture ring with is plastic.
However my copy seems to have been somewhat sloppily constructed.
One part of it have not been properly painted which doesn't really matter that much.
But a bigger problem is that the focus ring has a little lag and could be pulled a little back and forth which affects the focus.
Would not expect this lag to be a very common problem but build quality don't seems too great.
It is however a cheap lens still being made so not the best build quality is somewhat expected.


Conclusion

Image quality wide open is quite sharp and is well corrected for a flat focal plane, so little corner softness at infinity.
Stop it down a little and it goes from good to great and is surprisingly sharp.
Bokeh looks okay, nothing too impressive but better than many similar lenses.

Overall a nice lens which covers most use and can give some very nice quality images.


Thumbs up:
Image quality
Sharpness
Good closest focus
Value for the money

Thumbs down:
Build quality

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Technical Info

Analogue
Camera: Chinon CG-5
Scanner: Plustek OpticFilm 7600i
Film: AGFA CINEREX (X-ray film)
Developer: Kodak Xtol

Digital
Canon 500D with lens mount adapter