Help please: 75/1.8 instead of 35-100?

ryan2007 wrote:

The difference in light or stops from 1.8 to 2.8 is one stop. Specifically from 2.0 to 2.8 is one full stop.

All you have to do is up the ISO one step or shoot at a slower shutter speed by one step. The 35-100 2.8 is like having several 2.8 prime lenses in one.

If you get the 75 1.8 that is it, that is all that lens will ever be. This also means that you need to physically move a few feet back to re-frame if 75 mm is too tight. With any zoom you just zoom out even that little bit makes a difference especially if your backed into a wall.

the zoom lens is the better option as a one stop solution. The 75 mm is fine if you want to carry extra lenses and change lenses, but changing lenses may cost you missing a moment.