I bought it before reading this, but anyways, everything is in good condition (including the internal mirror/reflexive lens), and the lens is a 35-80mm one. Basically the guy needed money for his car repairs, and he also didn't know the full value of the camera (got it as a gift from his stepdad or something when he was living in Boston).
So, what is a 35-80mm lens good (or bad) for?
Well, I haven't actually heard of the 35-80mm till now
Apparently it is a really really old lens.Judging from it's lot in the Canon lineup, you'll probably get the sharpest photo if you stop down one step, and typically with lenses of this quality you can expect a great deal of softness as you progress towards the end of the lens.
Prob stick it around 40mm at 5.0/5.6 for maximum sharpness; this is a somewhat uneducated guess though, best way to figure it out is to set up an is012233 chart and take some pictures at different apertures.
Use this picture, just print out one and set it up in a well lit area (tripod preferred so you can remain stationary so your pictures don't vary wildly). Focus on a specific section (you don't need to get the whole thing in the picture), and then compare shots.
For example:
Set at 35mm, take picture at lowest aperture, then increase one stop and take picture, then increase one stop and take another picture, repeat.
Set at 40mm, repeat steps
Set at 50mm, repeat steps
You get the point.
This will give you all possible combinations and will show you exactly where your lens strengths lie. Also, don't bother going past f11 on your camera, since I bet that thing would refract like a motherfucker at any stop past that.
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Do you know the basic rules of shooting?