This is the Tamron 75-300 f/4-5.6 LD zoom lens. It's a fairly slow lens, so it sees limited use these days. It's great in bright daylight, but it has some limitations to beware of, such as the "dim tunnel viewfinder" effect due to the smaller f/4-5.6 apertures. What can you expect for under $200 on a lens? It's best used stopped down one or two f-stops. At maximum zoom, some pictures can appear drab, so a little Photoshop trickery helps out.
With some care, this lens is capable of producing great pictures:
A good example of a creepy moon
Butterfly, to show off the "macro" capability.
Seaport Belle from Rowe's Wharf. An example where the lens was zoomed out to 300mm and colors were somewhat drab, but Photoshop brought them out.
I have this lens up on eBay, as I've upgraded my lenses since I got this one. A result of being bitten by the photography bug is the rabid desire for professional-quality gear (read, lots of $$$money$$$), and this particular lens is not professional-quality.
Update: This lens has been SOLD 4/29/2006!