So, how is the lighting for indoor gym events like basketball and volley ball?
Also, how is the lighting for outdoor soccer with decent stadium lights around the field? (College/Highschool; playing at elementary schools with decent setups)
Using Canon EF 70-200mm F/2.8L IS USM what is a "idea" or "guess" on the shutter speed using F/2.8 and what ISO do you think I would have to use? (In gym and outdoors)
Using Canon Rebel XTi with no flash...
I have shot lunar eclipses that provided more light than some of the gyms I have been in. Others, not so bad. I have shoot football, soccer, softball and baseball on fields that had pronounced bright areas and some with black holes that sucked the light away and I'm shooting college level. Every field and every indoor venue is different.
For outdoor sports the 70-200 f2.8 is a good lens. It is always on a second body with the 400 f2.8 on my primary. For most field sports you want a shutter speed of 1/250th or faster. Adjust your ISO to suit the needs. If you are shooting in the evening, be sure to keep bumping up your ISO as the sun sets.
Indoors, if you are shooting from the floor I would suggest something other than the 70-200 f2.8. Again you want to shoot for a minimum 1/250th shutter speed. My indoor glass consists of the 35 f1.4L, 85 f1.8, 100 f2.0, 135 f2.0L and the 200 f2.8L. I know you wondering why the 200 f2.8L and not the 70-200 f2.8L . The 200 f2.8 lets me shoot faster in terms of shutter speed than the 70-200 as it being a prime it's light gathering properties are different. Plus it is much sharper wide open than the zoom.
If you are shooting from the stands and need the reach then the 70-200 a lot of times can still be usable you are just may have to push the ISO pretty high to get the shutter speed you need.
One thing that has helped in shooting on the home court is being able to go out on the court ahead of time (like days ahead) and meter the whole court. That way I have an idea where the problem spots are. The home court is not bad as the lighting is plentiful and consistent. Some of the away courts however are really terrible and just plain require fast glass. Being able to get the ISO you need is going to be the deciding factor in keeping you shutter speeds up. I would rather have a noisy but sharp photo rather than one that is blurry with less noise. Good luck.