I did some time ago, the new Canon FDn 80-200mm f/4.0 bought for very little money (25 euros). There are three versions of this lens in the FD series: the old Canon FD 80-200 f/4.0 ssc with the silver ring on the bayonet and the filter size of 55mm, the Canon FD 80-200mm L lens with the red ring and the new FDn 80-200mm f/4.0 s.s.c. (my copy) without the silver ring and a filter size of 58mm.
All of these lenses have an excellent reputation. Nevertheless, they are - of course not the L variant, not expensive and you can buy them for a price between 30 and a maximum of 100 euros.
For Canon FDn 80-200mm f/4.0 s.s.c.: It is about 16 centimeters long and 790 grams in weight, the sun visor is integrated and can be slid out when needed. It is constructed completely of metal and contains a total of 15 lenses in 11 groups. The closest focus distance is 1 meter.
Adapted to the small EOS-M provides the lens with really huge. Here are some pictures:
The lens is heavy and cumbersome. It can not be reasonably used in a systemcamera. Even with an exposure time of 1/200 second camera shake caused by the high weight, which makes the photo may be blurry. The use of a tripod is recommended in any case.
On the other hand, the image quality and sharpness is excellent. All photos I shot at maximum aperture. The stop down brings out a greater depth of field no benefits.
So overall a very good lens. Unfortunately, it is for the use of a systemcamera, wether EOS-M, Sony NEX or Olympus mft completely counterproductive. The combination of lens and camera is unwieldy because far too big and too heavy.
The weather was crappy: only fog and light drizzle. So I had to shoot with a high ISO speed. I did not have a tripod here. I hope I can show at a later date a few more photos in better weather.