I just got a new Canon 60D. My husband had a lens he bought at a thrift store several years ago, which I had never seen. It was in the original box, looks almost unused and even has the eggsheal packing insert. It turns out to be a Canon AF mount Sigma 28-300mm Compact Hyperzoom Aspherical IF 3.5-6.3 SLD Glass for Canon AF. It fits on my old D60. On the old D60 it tries to focus, but none of the focus points (only 3) light up at all. The viewfinder is very dark, it wants long exposure (even when pointing outside) and won't fire. My old camera was not working correctly (hence I was finally able to buy the 60D) so I'm not sure if it is the lens or the camera.
Is this very dark look through the viewfinder normal for this focal length/aperture? Was this a quality lens? I'm a little afraid to mess up my new 60D by trying it on there. Can it hurt my new camera?
I also bought a Canon EF 70-300 f/4-5.6 IS USM, but I haven't taken it out of the box. Will this lens also have such a dark viewfinder even though it is a Canon lens (I assume a more recent build)? I will post another question about this long lens (my new Canon) versus a much more expensive Tamron f/2.8 zoom.
Thanks for any help on this old lens and what I should expect with these long zooms.