Have 3 Logitech cameras tested

we got coming, and we wanted to video calls with grandma.
The webcam in the laptop was not very good, and the camera work including laptop was also significantly improved, it was clear, it needs to establish a webcam .... just what?
An acquaintance had collected the Logitech C500 and so good experiences.
On the internet I've been looking for a while, but even if Logitech I could not figure out the exact differences between the C510, C525 and C600, two of them were not to be found at Logitech.
Now I certainly am not among those who buy something, or only buy the most expensive, but for those who want to have the best price / performance ratio, and the price may well go through good performance times upwards.
What to do if you have a choice, and no one decreases the decision?
I have just once every three purchased from Amazon, tested this and the two again returned the not gefiehlen me. I have never done so a test purchase, but I think that's really a great way.
So close in on the bacon:
All three cameras were within 2 days in the house, were unpacked very cautious and could be tested.
One thing first: The C510, C525 and C600 are of very high quality, make a solid and thoughtful impression and provide excellent images.
One can achieve very good results, all are good for video calls absolutely what with all three cameras.
But where now are the differences?
That's what I actually only found out when trying out.
The C510 and C525 have the same case, the C600 another.
The C525 has an auto focus, the somewhat slow to respond, but achieved fairly good results. This was the only camera which can be set before a page of text, and the one on the other side of the line may read this also. The C510, the C600 and the thanks fixed focus not unfortunately.
The C600 showed a slightly larger field of view than the other two cameras here probably a slight wide angle lens is used. When C600 is I have noticed that this tendency for very dark images on a light stripe pattern in the pictures, the C510 and C525 have something not shown.
The C510 has neither light nor wide angle lens auto focus.
My choice was therefore the C525.
But the other two cameras you can recommend without reservation.
The differences are really only slight nuances.

Many Greetings,
Chris