Pentax FA28-105/4-5.6

This lens was the kitlens with the Pentax Z1-p what I still find one off the best camera's Pentax 've made. It's 3.75x zoom and at that times is was not so common. I really liked this lens on trips and hollydays . The only bad this is that when using a build in flash you get vignetting until 35mm. It's a real powerzoom lens making it quiet easy to do zoom-shots. I've not really used it on this lens and it probably eats battery's.
When I bought the Ist-D together with the FA18-35, this lens has frequently been the second lens I took with me. Today it's the DA16-45 and DA50-200

Performance
This lens show's a typical performance of a begin '90's lens without aspherical lens-elements. At the wide end side it needs to be stopped down to f5.6 to become usable. f4 is usable for small prints like 10x15cm because the contrast is even wide open decent, but there is still a bit of vignettering even on a crop camera. At f11 it even delivers very good figures. That also the reason the Hyper MTF Program selects a as high as possible number at the wide end.
At 50mm and 105mm the lens is performce better but still need to be stopped down one stop to become very good (not great).
This lens got a 8 for CA and has a bit lower contrast than the other lenses in this test.
So If you look at these figures, you could conclude that it's a bad lens. Oké, it hasn't the perfomance of the current lenses (I don't have a DA18-55 kit lens to compare) this lens still performs better then the lens of a Canon S50 compact camera (max 1710lph) and the corners are as good as the center is.

Would I recommend this lens to someone? Hmmm difficult question. On a analogue body, probably because they sell rather cheap. On a digital body it depends on the amount of money to spend. This lens becomes a 42-160mm on a crop body making it a standaard- to light tele-lens. The DA50-200 performs better and is lighter but also more expensive new and second hand. The F70-200/4-5.6 is also a good lens but also more expensive. The FA70-210/4-5.6 and FA100-300 aren't any better but deliver 2x the range.This lens could be use together with a 18-35 (like I did) or 18-55. Outdoor it's very usable to take pictures of the kits. The only question is why it sells for more than the FA28-70/4 AL? Probably the reach you get.