These are good to give you some idea of exposue when you have no idea to begin with. However, the gaps between the wedges are too large and you really need to do another test with times between the two wedges that you think look the best. Also the wedges may not cover areas that have similar density thus tricking you into believing something that's not quite right. If you do a test using the full 60 seconds and it comes out too dark you can half the time (expose for 30 secs) and halve the segment times, etc.
Originally Posted by zackesch