Recently tested all 3 models for cost effective VC office installation. I would recommend the C930 for group video calls as 90 degrees makes a huge difference. To be honest, the picture between C930 and C925 is very similar, and the key point is the angle of coverage. With the C920, that's the price of the game - $20 less for lower video quality. Highest price, sharper than C920 but not as sharp as C925. Much wider at 90 degrees - much wider at 90 degrees - for my use this was best for VCs where 4 people sit around the table - the wider angle makes a huge difference
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