Thanks for reply.
Lovely images of Godwits.
The above images were all shot in AV, Auto ISO; I forgot to change iso range and shutter speed so I might know where I went wrong, however I'm in process of configuring C1 and C2 to compensate for my lack of photography ability. The wetlands where I live I'm having to shoot with the sun/bright light from front on at 2° clock; if 12 straight ahead, therefore water glare is a constant issue.
I shoot in RAW or JPEG, sometimes both.
Custom Mode C1av now set to:
RAW, AI Servo, Spot AF, Evaluation Metering, High Speed Continuous, iso speed setting Auto, iso speed range 100-3200, Auto range 100-6400, Min shutter speed 1/250, Picture style standard, High iso speed Low, Auto focus tracking +1, Accel/decel tracking 0, AF pt auto switching 0, AI Servo 1st image priority Focus, AI Servo 2nd image priority middle, Lens drive when AF impossible 0, Select AF area select mode all, Limit AF methods all, AF area selection method 0, Orientation linked AF point 1, Initial Servo AF 1, Auto AF pt sel EIS iTR AF 2, AF point selection movement 0, AF point display during focus 0, VF display illum 0, AFM none.
Custom Mode C2m now set to:
RAW/JPEG, One Shot, 9pt Zone, Evaluation Metering, Low Speed Continuous, f5, 1/2000, Auto iso, iso speed range 100-3200, Auto range 100-12800, Min shutter speed 1/500, Auto lighting optimizer standard, AWB, Picture Style Neutral. C. FN I Autofocus Tracking sensivity 0, Accel/dcel tracking 0, AF pt auto switching 0, AI Servo 1st image priority middle, AI Servo 2nd image Priority middle, Lens Drive 0, Select AF area all, Limit AF methods all, AF area selection 0, Orientation linked AF point 1, Initial Servo AF pt 1, EOS iTR AF 2, AF point selection movement 0, AF point display during focus 0, VF display illum 0, AF micro adj (not done yet can't see any back or front focusing from these images.
Exposure compensation changed as necessary.
Sigma set to Focus Priority, Dynamic View, I know the Sigma needs some calibration, just have to wait till rain stops so I can get outside to get right distance ranges for focusing chart.
Canon 100-400mm left on default settings.
Any points gratefully received.
First, I don't have a 90D so maybe it's different. In your first post, you didn't say if you were using single point, small zone...etc for focus. Does the software you use in post show you the active AF points. It can give you some idea what is going on.
In your second post you list C1 as AI Servo and spot AF but no mention of intended use. If you are using spot AF for BIF then you can definitely track a lot better than I can.