What happens if you take a white sheet A grey Sheet and a Black sheet and photograph them separately.
Fill the veiwfinder with just a single colour.
If you have trouble focusing, you can move the center of the viewfinder to the edge and half press the shutter button. Don't push it all the way and move back into the center of the sheet and full press the shutter button.
Hmm, is this what you expected?
All the photos look a pretty similar grey! Is there something wrong with my camera? Well no.
So now put a small reference card in the middle of each sheet. This little card could be a photo, it just needs to contain a decent tonal range (eg from very dark to very light. Take the photos again.
These were all taken with the same camera. The only thing I did was push the shutter button once i has focussed on each sheet.
One hint is my camera is working exactly as it should. There is nothing wrong with it.
Try this out yourself. You can do it with just two sheets (eg black & white).
If you want you can leave a polite comment explaining what's happening but I might leave my further discussion for a couple of weeks.
Have fun
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