My brother-in-law gave me his old Canon Ti 35mm film camera with the 28-90mm lens a few months ago. I had tried out the camera with my 135mm lens which produced fine results but I had heard not so good things about the 28-90mm lens. It has been described as a cheap plastic toy lens that produces terrible soft results especially on either of the extremes of the focal range, simply put, a lens that was built to be cheap by cutting a lot of corners and it shows.
Just to see how bad it really is, I tested it on my Canon 5d yesterday, and I have to say that I was pleasantly surprised by the results. Granted, after being used to prime lenses with maximum aperture no less than f/2.8, I was pretty frustrated with the variable aperture of 4-5.6, but overall the results really aren’t bad. The below is an image of my oldest daughter taken in our sunroom all the way zoomed in to 90mm. It’s more or less as it came out-of-camera, I only made small changes to white balance (tint +25), contrast (+10), and vibrance (+25) to the RAW file before converting it to jpeg. I wasnted to keep it as close to SOOC as possible just to show that it really is reasonably sharp lens, that produces perfectly acceptable results.
(90mm, ISO 1250, f/5.6, 1/60 sec)